Breaking through the feed barrier: options for improving forage genetics
B. A. Barrett A C , M. J. Faville A , S. N. Nichols B , W. R. Simpson A , G. T. Bryan A and A. J. Conner A
+ Author Affiliations
- Author Affiliations
A AgResearch Limited, Grasslands Research Centre, Private Bag 11008, Palmerston North 4442, New Zealand.
B AgResearch Limited, Ruakura Research Centre, Private Bag 3123, Hamilton 3240, New Zealand.
C Corresponding author. Email: brent.barrett@agresearch.co.nz
Animal Production Science 55(7) 883-892 https://doi.org/10.1071/AN14833
Submitted: 26 September 2014 Accepted: 12 April 2015 Published: 3 June 2015
Journal Compilation © CSIRO Publishing 2015 Open Access CC BY-NC-ND
Abstract
Pasture based on perennial ryegrass (Lolium perenne L.) and white clover (Trifolium repens L.) is the foundation for production and profit in the Australasian pastoral sectors. The improvement of these species offers direct opportunities to enhance sector performance, provided there is good alignment with industry priorities as quantified by means such as the forage value index. However, the rate of forage genetic improvement must increase to sustain industry competitiveness. New forage technologies and breeding strategies that can complement and enhance traditional approaches are required to achieve this. We highlight current and future research in plant breeding, including genomic and gene technology approaches to improve rate of genetic gain. Genomic diversity is the basis of breeding and improvement. Recent advances in the range and focus of introgression from wild Trifolium species have created additional specific options to improve production and resource-use-efficiency traits. Symbiont genetic resources, especially advances in grass fungal endophytes, make a critical contribution to forage, supporting pastoral productivity, with benefits to both pastures and animals in some dairy regions. Genomic selection, now widely used in animal breeding, offers an opportunity to lift the rate of genetic gain in forages as well. Accuracy and relevance of trait data are paramount, it is essential that genomic breeding approaches be linked with robust field evaluation strategies including advanced phenotyping technologies. This requires excellent data management and integration with decision-support systems to deliver improved effectiveness from forage breeding. Novel traits being developed through genetic modification include increased energy content and potential increased biomass in ryegrass, and expression of condensed tannins in forage legumes. These examples from the wider set of research emphasise forage adaptation, yield and energy content, while covering the spectrum from exotic germplasm and symbionts through to advanced breeding strategies and gene technologies. To ensure that these opportunities are realised on farm, continuity of industry-relevant delivery of forage-improvement research is essential, as is sustained research input from the supporting pasture and plant sciences.
Additional keywords: endophyte, genetic modification, genomic selection, inter-specific hybridisation.
References
Abberton MT, Thomas I (2011) Genetic resources in Trifolium and their utilization in plant breeding. Plant Genetic Resources 9, 38–44.| Genetic resources in Trifolium and their utilization in plant breeding.Crossref | GoogleScholarGoogle Scholar |
Aerts RJ, Barry TN, McNabb WC (1999) Polyphenols and agriculture: beneficial effects of proanthocyanidins in forages. Agriculture, Ecosystems & Environment 75, 1–12.
| Polyphenols and agriculture: beneficial effects of proanthocyanidins in forages.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DyaK1MXkvVCgtLc%3D&md5=8af5ca104363f8be198bc5a2b8ab9263CAS |
Andrade-Sanchez P, Gore MA, Heun JT, Thorp KR, Carmo-Silva AE, French AN, Salvucci ME, White JW (2014) Development and evaluation of a field-based high-throughput phenotyping platform. Functional Plant Biology 41, 68–79.
| Development and evaluation of a field-based high-throughput phenotyping platform.Crossref | GoogleScholarGoogle Scholar |
Araus JL, Cairns JE (2014) Field high-throughput phenotyping: the new crop breeding frontier. Trends in Plant Science 19, 52–61.
| Field high-throughput phenotyping: the new crop breeding frontier.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3sXhs1CrtbjL&md5=d20ff0c6a3e28d1d3ec504bb48f105a1CAS | 24139902PubMed |
Ballizany WL, Hofmann RW, Jahufer MZZ, Barrett BA (2012a) Genotype × environment analysis of flavonoid accumulation and morphology in white clover under contrasting field conditions. Field Crops Research 128, 156–166.
| Genotype × environment analysis of flavonoid accumulation and morphology in white clover under contrasting field conditions.Crossref | GoogleScholarGoogle Scholar |
Ballizany WL, Hofmann RW, Jahufer MZZ, Barrett BA (2012b) Multivariate associations of flavonoid and biomass accumulation in white clover (Trifolium repens) under drought. Functional Plant Biology 39, 167–177.
| Multivariate associations of flavonoid and biomass accumulation in white clover (Trifolium repens) under drought.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC38XisVygsr4%3D&md5=07ad05805f670a3a860f33f940fc1e6eCAS |
Barrett B, Baird I, Woodfield D (2008) White clover seed yield: a case study in marker assisted selection. In ‘Molecular breeding of forage and turf: proceedings of the 5th international symposium’. (Eds T Yamada, G Spangenberg) Vol. 1 pp. 241–250. (Springer: Sapporo, Japan)
Brummer EC, Casler MD (2014) Cool-season forages. In ‘Yield gains in major US field crop’s’ (Eds S Smith, B Diers, J Specht, B Carver) pp. 33–52. (American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America)
Bryant J, Lopez-Villalobos N, Holmes C, Pryce J, Rossi J, Macdonald K (2008) Development and evaluation of a pastoral simulation model that predicts dairy cattle performance based on animal genotype and environmental sensitivity information. Agricultural Systems 97, 13–25.
| Development and evaluation of a pastoral simulation model that predicts dairy cattle performance based on animal genotype and environmental sensitivity information.Crossref | GoogleScholarGoogle Scholar |
Bryant JR, Ogle G, Marshall PR, Glassey CB, Lancaster JAS, García SC, Holmes CW (2010) Description and evaluation of the Farmax Dairy Pro decision support model. New Zealand Journal of Agricultural Research 53, 13–28.
| Description and evaluation of the Farmax Dairy Pro decision support model.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3cXktlCitLk%3D&md5=fe0fd7ed54691adef3d4656286b855aeCAS |
Casler MD, Brummer EC (2008) Theoretical expected genetic gains for among-and-within-family selection methods in perennial forage crops. Crop Science 48, 890–902.
| Theoretical expected genetic gains for among-and-within-family selection methods in perennial forage crops.Crossref | GoogleScholarGoogle Scholar |
Chapman DF, Bryant JR, McMillan WH, Khaembah EN (2012) Economic values for evaluating pasture plant traits. Proceedings of the New Zealand Grassland Association 74, 209–215.
Cosgrove GP, Anderson CB, Knight TW, Roberts NJ, Waghorn GC (2004) Forage lipid concentration, fatty acid profile and lamb productivity. Proceedings of the New Zealand Grassland Association 66, 251–256.
Crossa J, Pérez P, Hickey J, Burgueño J, Ornella L, Cerón-Rojas J, Zhang X, Dreisigacker S, Babu R, Li Y, Bonnett D, Mathews K (2014) Genomic prediction in CIMMYT maize and wheat breeding programs. Heredity 112, 48–60.
| Genomic prediction in CIMMYT maize and wheat breeding programs.Crossref | GoogleScholarGoogle Scholar | 1:STN:280:DC%2BC3srjsl2qsg%3D%3D&md5=9e458d95511613789aaf53fb3b676c22CAS | 23572121PubMed |
Crush JR, Rowarth JS (2007) The role of C4 grasses in New Zealand pastoral systems. New Zealand Journal of Agricultural Research 50, 125–137.
| The role of C4 grasses in New Zealand pastoral systems.Crossref | GoogleScholarGoogle Scholar |
Crush JR, Woodward SL, Eerens JPJ, MacDonald KA (2006) Growth and milksolids production in pastures of older and more recent ryegrass and white clover cultivars under dairy grazing. New Zealand Journal of Agricultural Research 49, 119–135.
| Growth and milksolids production in pastures of older and more recent ryegrass and white clover cultivars under dairy grazing.Crossref | GoogleScholarGoogle Scholar |
Davey JW, Hohenlohe PA, Etter PD, Boone JQ, Catchen JM, Blaxter ML (2011) Genome-wide genetic marker discovery and genotyping using next-generation sequencing. Nature Reviews. Genetics 12, 499–510.
| Genome-wide genetic marker discovery and genotyping using next-generation sequencing.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3MXnslShu7k%3D&md5=b60e40adfe090acb1169efee0820466bCAS | 21681211PubMed |
Douglas GB, Stienezen M, Waghorn GC, Foote AG, Purchas RW (1999) Effect of condensed tannins in birdsfoot trefoil (Lotus corniculatus) and sulla (Hedysarum coronarium) on body weight, carcass fat depth, and wool growth of lambs in New Zealand. New Zealand Journal of Agricultural Research 42, 55–64.
| Effect of condensed tannins in birdsfoot trefoil (Lotus corniculatus) and sulla (Hedysarum coronarium) on body weight, carcass fat depth, and wool growth of lambs in New Zealand.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DyaK1MXjtFCrs78%3D&md5=d453f62e5f47cbd41cbb3c40be84643dCAS |
Easton HS (2007) Grasses and Neotyphodium endophytes: co-adaptation and adaptive breeding. Euphytica 154, 295–306.
| Grasses and Neotyphodium endophytes: co-adaptation and adaptive breeding.Crossref | GoogleScholarGoogle Scholar |
Ekanayake PN, Hand ML, Spangenberg GC, Forster JW, Guthridge KM (2012) Genetic diversity and host specificity of fungal endophyte taxa in fescue pasture grasses. Crop Science 52, 2243–2252.
| Genetic diversity and host specificity of fungal endophyte taxa in fescue pasture grasses.Crossref | GoogleScholarGoogle Scholar |
Ekanayake PN, Rabinovich M, Guthridge KM, Spangenberg GC, Forster JW, Sawbridge TI (2013) Phylogenomics of fescue grass-derived fungal endophytes based on selected nuclear genes and the mitochondrial gene complement. BMC Evolutionary Biology 13,
| Phylogenomics of fescue grass-derived fungal endophytes based on selected nuclear genes and the mitochondrial gene complement.Crossref | GoogleScholarGoogle Scholar | 24330497PubMed |
Ellison NW, Liston A, Steiner JJ, Williams WM, Taylor NL (2006) Molecular phylogenetics of the clover genus (Trifolium – Leguminosae). Molecular Phylogenetics and Evolution 39, 688–705.
| Molecular phylogenetics of the clover genus (Trifolium – Leguminosae).Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD28XkslSlt74%3D&md5=c2c2ae62a56b5e3d802aaee644a1b9a1CAS | 16483799PubMed |
Elshire RJ, Glaubitz JC, Sun Q, Poland JA, Kawamoto K, Buckler ES, Mitchell SE (2011) A robust, simple genotyping-by-sequencing (GBS) approach for high diversity species. PLoS One 6, e19379
| A robust, simple genotyping-by-sequencing (GBS) approach for high diversity species.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3MXmtVKru7Y%3D&md5=f60471205eb7c2831dcb1415ae8fba4cCAS | 21573248PubMed |
Faville MJ, Griffiths AG, Jahufer MZZ, Barrett BA (2012) Progress towards marker-assisted selection in forages. Proceedings of the New Zealand Grassland Association 74, 189–194.
Finch S, Munday R, Munday JS, Fletcher LR, Hawkes AD (2007) Risk assessment of endophyte toxins. In ‘Proceedings of the 6th international symposium on fungal endophytes of grasses’. Grassland Research and Practice Series. Christchurch, New Zealand.
Finch SC, Thom ER, Babu JV, Hawkes AD, Waugh CD (2013) The evaluation of fungal endophyte toxin residues in milk. New Zealand Veterinary Journal 61, 11–17.
| The evaluation of fungal endophyte toxin residues in milk.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC38XhvVamtb%2FL&md5=bd56f83c38cc63dc24783a921071031dCAS | 22984816PubMed |
Fletcher LR (2005) Managing ryegrass–endophyte toxicoses. In ‘Neotyphodium in cool-season grasses’. (Eds CA Roberts, CP West, DE Spiers) pp. 227–241. (Blackwell Publishing: Melbourne)
Fletcher LR, Harvey IC (1981) An association of a Lolium endophyte with ryegrass staggers. New Zealand Veterinary Journal 29, 185–186.
| An association of a Lolium endophyte with ryegrass staggers.Crossref | GoogleScholarGoogle Scholar | 1:STN:280:DyaL387kvFemsQ%3D%3D&md5=01a17d809edf61418c2d5e3dab897113CAS | 6950332PubMed |
Fletcher LR, Sutherland BL (2009) Sheep responses to grazing ryegrass with AR37 endophyte. Proceedings of the New Zealand Grassland Association 71, 127–132.
Flowers G, Ibrahim SA, AbuGhazaleh AA (2008) Milk fatty acid composition of grazing dairy cows when supplemented with linseed oil. Journal of Dairy Science 91, 722–730.
| Milk fatty acid composition of grazing dairy cows when supplemented with linseed oil.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD1cXhsVaitrc%3D&md5=b049fc10f602c88b62a48ac540b0edacCAS | 18218760PubMed |
Ford JL, Barrett BA (2011) Improving red clover persistence under grazing. Proceedings of the New Zealand Grassland Association 73, 119–124.
García SC, Islam MR, Clark CEF, Martin PM (2014) Kikuyu-based pasture for dairy production: a review. Crop and Pasture Science 65, 787–797.
| Kikuyu-based pasture for dairy production: a review.Crossref | GoogleScholarGoogle Scholar |
Getachew G, Ibáñez AM, Pittroff W, Dandekar AM, McCaslin M, Goyal S, Reisen P, DePeters EJ, Putnam DH (2011) A comparative study between lignin down regulated alfalfa lines and their respective unmodified controls on the nutritional characteristics of hay. Animal Feed Science and Technology 170, 192–200.
| A comparative study between lignin down regulated alfalfa lines and their respective unmodified controls on the nutritional characteristics of hay.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3MXhsVOrurbL&md5=6d3aba6ec64be4fe35113038e982b050CAS |
Glasser F, Doreau M, Maxin G, Baumont R (2013) Fat and fatty acid content and composition of forages: a meta-analysis. Animal Feed Science and Technology 185, 19–34.
| Fat and fatty acid content and composition of forages: a meta-analysis.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3sXhtF2iu7zI&md5=071482a0e1c5119e15750e3978e0c380CAS |
Grainger C, Beauchemin KA (2011) Can enteric methane emissions from ruminants be lowered without lowering their production? Animal Feed Science and Technology 166–167, 308–320.
| Can enteric methane emissions from ruminants be lowered without lowering their production?Crossref | GoogleScholarGoogle Scholar |
Griffiths AG, Barrett BA, Simon D, Khan AK, Bickerstaff P, Anderson CB, Franzmayr BK, Hancock KR, Jones CS (2013) An integrated genetic linkage map for white clover (Trifolium repens L.) with alignment to Medicago. BMC Genomics 14,
| An integrated genetic linkage map for white clover (Trifolium repens L.) with alignment to Medicago.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3sXhsVKrtrjP&md5=e98f4062476d5ad0deb8be9caae51f41CAS | 23758831PubMed |
Hancock KR, Collette V, Fraser K, Greig M, Xue H, Richardson K, Jones C, Rasmussen S (2012) Expression of the R2R3-MYB transcription factor TaMYB14 from Trifolium arvense activates proanthocyanidin biosynthesis in the legumes Trifolium repens and Medicago sativa. Plant Physiology 159, 1204–1220.
| Expression of the R2R3-MYB transcription factor TaMYB14 from Trifolium arvense activates proanthocyanidin biosynthesis in the legumes Trifolium repens and Medicago sativa.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC38XhtVGlsbnN&md5=b3ee32c471e669f937e4a9fce6b914b2CAS | 22566493PubMed |
Hayes BJ, Cogan NOI, Pembleton LW, Goddard ME, Wang J, Spangenberg GC, Forster JW (2013) Prospects for genomic selection in forage plant species. Plant Breeding 132, 133–143.
| Prospects for genomic selection in forage plant species.Crossref | GoogleScholarGoogle Scholar |
Heffner EL, Lorenz AJ, Jannink J-L, Sorrells ME (2010) Plant breeding with genomic selection: gain per unit time and cost. Crop Science 50, 1681–1690.
| Plant breeding with genomic selection: gain per unit time and cost.Crossref | GoogleScholarGoogle Scholar |
Hegarty M, Yadav R, Lee M, Armstead I, Sanderson R, Scollan N, Powell W, Skøt L (2013) Genotyping by RAD sequencing enables mapping of fatty acid composition traits in perennial ryegrass (Lolium perenne (L.)). Plant Biotechnology Journal 11, 572–581.
| Genotyping by RAD sequencing enables mapping of fatty acid composition traits in perennial ryegrass (Lolium perenne (L.)).Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3sXhtFWqtrbE&md5=ad46b47ea78ae201113b2fb35bf55d4aCAS | 23331642PubMed |
Hesse U, Schoberlein W, Wittenmayer L, Forster K, Warnstorff K, Diepenbrock W, Merbach W (2003) Effects of Neotyphodium endophytes on growth, reproduction and drought-stress tolerance of three Lolium perenne L. genotypes. Grass and Forage Science 58, 407–415.
| Effects of Neotyphodium endophytes on growth, reproduction and drought-stress tolerance of three Lolium perenne L. genotypes.Crossref | GoogleScholarGoogle Scholar |
Hesse U, Hahn H, Andreeva K, Forster K, Warnstorff K, Schoberlein W, Diepenbrock W (2004) Investigations on the influence of Neotyphodium endophytes on plant growth and seed yield of Lolium perenne genotypes. Crop Science 44, 1689–1695.
| Investigations on the influence of Neotyphodium endophytes on plant growth and seed yield of Lolium perenne genotypes.Crossref | GoogleScholarGoogle Scholar |
Hussain S, Williams WM (2013) Trifolium occidentale: a valuable genetic resource for white clover improvement. In ‘Revitalising grasslands to sustain our communities: proceedings 22nd international grassland congress’, Sydney. (Eds DL Michalk, GD Milla, WB Badgery, KM Broadfoot) pp. 309–310. (New South Wales Department of Primary Industry: Orange, NSW)
Jahufer MZZ, Ford JL, Widdup KH, Harris C, Cousins G, Ayres JF, Lane LA, Hofmann RW, Ballizany WL, Mercer CF, Crush JR, Williams WM, Woodfield DR, Barrett BA (2012) Improving white clover for Australasia. Crop and Pasture Science 63, 739–745.
| Improving white clover for Australasia.Crossref | GoogleScholarGoogle Scholar |
James C (2013) ‘Global status of commercialised botech/GM crops. ISAAA brief no. 46.’ (The International Service for the Acquisition of Agri-biotech Applications: Ithaca, NY)
Jang I–C, Nahm B, Kim J-K (1999) Subcellular targeting of green fluorescent protein to plastids in transgenic rice plants provides a high-level expression system. Molecular Breeding 5, 453–461.
| Subcellular targeting of green fluorescent protein to plastids in transgenic rice plants provides a high-level expression system.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DyaK1MXms1WgsLc%3D&md5=bacb3f1b283c9e83653239ae06dc6d10CAS |
Johnson LJ, De Bonth ACM, Briggs LR, Caradus JR, Finch SC, Fleetwood DJ, Fletcher LR, Hume DE, Johnson RD, Popay AJ, Tapper BA, Simpson WR, Voisey CR, Card SD (2013) The exploitation of epichloae endophytes for agricultural benefit. Fungal Diversity 60, 171–188.
| The exploitation of epichloae endophytes for agricultural benefit.Crossref | GoogleScholarGoogle Scholar |
King J, Armstead I, Harper J, Ramsey L, Snape J, Waugh R, James C, Thomas A, Gasior D, Kelly R, Roberts L, Gustafson P, King I (2013) Exploitation of interspecific diversity for monocot crop improvement. Heredity 110, 475–483.
| Exploitation of interspecific diversity for monocot crop improvement.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3sXmt1Ohur4%3D&md5=c9d924c722e2f9472d102c61ab1840d4CAS | 23321705PubMed |
Klotz JL, Bush LP, Smith DL, Shafer WD, Smith LL, Arlington BC, Strickland JR (2007) Ergovaline-induced vasoconstriction in an isolated bovine lateral saphenous vein bioassay. Journal of Animal Science 85, 2330–2336.
| Ergovaline-induced vasoconstriction in an isolated bovine lateral saphenous vein bioassay.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD2sXpsVGlsbw%3D&md5=71f85ab38c0a4686dea252630ec36213CAS | 17504952PubMed |
Lado B, Matus I, Rodríguez A, Inostroza L, Poland J, Belzile F, del Pozo A, Quincke M, Castro M, von Zitzewitz J (2013) Increased genomic prediction accuracy in wheat breeding through spatial adjustment of field trial data. G3: Genes, Genomes. Genetics 3, 2105–2114.
Lean IJ (2001) Association between feeding perennial ryegrass (Lolium perenne cultivar Grasslands Impact) containing high concentrations of ergovaline, and health and productivity in a herd of lactating dairy cows. Australian Veterinary Journal 79, 262–264.
| Association between feeding perennial ryegrass (Lolium perenne cultivar Grasslands Impact) containing high concentrations of ergovaline, and health and productivity in a herd of lactating dairy cows.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD3MXjtlGqtLo%3D&md5=ffce084d2ed168ee8379367dcccffc9fCAS | 11349413PubMed |
Massman JM, Jung H-JG, Bernardo R (2013) Genomewide selection versus marker-assisted recurrent selection to improve grain yield and stover-quality traits for cellulosic ethanol in maize. Crop Science 53, 58–66.
| Genomewide selection versus marker-assisted recurrent selection to improve grain yield and stover-quality traits for cellulosic ethanol in maize.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3sXnsVOlt7c%3D&md5=1b86714115974a718862003645fc6d81CAS |
Maureira-Butler I, Udall J, Osborn T (2007) Analyses of a multi-parent population derived from two diverse alfalfa germplasms: testcross evaluations and phenotype–DNA associations. Theoretical and Applied Genetics 115, 859–867.
| Analyses of a multi-parent population derived from two diverse alfalfa germplasms: testcross evaluations and phenotype–DNA associations.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD2sXhtVKru7zN&md5=9680ef679bdaea8314bd3cbd868265fbCAS | 17676305PubMed |
McMahon LR, McAllister TA, Berg BP, Majak W, Acharya SN, Popp JD, Coulman BE, Wang Y, Cheng KJ (2000) A review of the effects of forage condensed tannins on ruminal fermentation and bloat in grazing cattle. Canadian Journal of Plant Science 80, 469–485.
| A review of the effects of forage condensed tannins on ruminal fermentation and bloat in grazing cattle.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD3cXmvVWmsLg%3D&md5=7f0d21bb432a46e583327d8f43ee5817CAS |
Meuwissen THE, Hayes BJ, Goddard ME (2001) Prediction of total genetic value using genome-wide dense marker maps. Genetics 157, 1819–1829.
Miles JW, Cardona C, Sotelo G (2006) Recurrent selection in a synthetic brachiariagrass population improves resistance to three spittlebug species. Crop Science 46, 1088–1093.
| Recurrent selection in a synthetic brachiariagrass population improves resistance to three spittlebug species.Crossref | GoogleScholarGoogle Scholar |
Moate PJ, Williams SRO, Grainger C, Hannah MC, Mapleson D, Auldist MJ, Greenwood JS, Popay AJ, Hume DE, Mace WJ, Wales WJ (2012) Effects of wild-type, AR1 and AR37 endophyte-infected perennial ryegrass on dairy production in Victoria, Australia. Animal Production Science 52, 1117–1130.
| Effects of wild-type, AR1 and AR37 endophyte-infected perennial ryegrass on dairy production in Victoria, Australia.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC38Xhs1Wju7zL&md5=c6b89614bcb4131738e9e8a13d2eb78eCAS |
Müller CB, Krauss J (2005) Symbiosis between grasses and asexual fungal endophytes. Current Opinion in Plant Biology 8, 450–456.
| Symbiosis between grasses and asexual fungal endophytes.Crossref | GoogleScholarGoogle Scholar | 15946893PubMed |
Nichols SN, Crush JR, Ouyang L (2014a) Phosphate responses of some Trifolium repens × Trifolium uniflorum interspecific hybrids grown in soil. Crop and Pasture Science 65, 382–387.
| Phosphate responses of some Trifolium repens × Trifolium uniflorum interspecific hybrids grown in soil.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC2cXotVKnsb4%3D&md5=ab3abcacfd3d2e139317d6449bc2ad13CAS |
Nichols SN, Hofmann RW, Williams WM (2014b) Drought resistance of Trifolium repens × Trifolium uniflorum inter-specific hybrids. Crop and Pasture Science 65, 911–921.
| Drought resistance of Trifolium repens × Trifolium uniflorum inter-specific hybrids.Crossref | GoogleScholarGoogle Scholar |
Nichols SN, Hofmann RW, Williams WM (2014c) The effect of interspecific hybridisation with Trifolium uniflorum on key white clover characteristics. Field Crops Research 161, 107–117.
| The effect of interspecific hybridisation with Trifolium uniflorum on key white clover characteristics.Crossref | GoogleScholarGoogle Scholar |
Nichols SN, Hofmann RW, Williams WM, Crush JR (2014d) Nutrient responses and macronutrient composition of some Trifolium repens × Trifolium uniflorum interspecific hybrids. Crop and Pasture Science 65, 370–381.
| Nutrient responses and macronutrient composition of some Trifolium repens × Trifolium uniflorum interspecific hybrids.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC2cXotVKnsbo%3D&md5=03b6288849c1214dc0b87b929755d172CAS |
Palladino RA, O’Donovan M, Kennedy E, Murphy JJ, Boland TM, Kenny DA (2009) Fatty acid composition and nutritive value of twelve cultivars of perennial ryegrass. Grass and Forage Science 64, 219–226.
| Fatty acid composition and nutritive value of twelve cultivars of perennial ryegrass.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD1MXmvFejtrw%3D&md5=4ca2c7e5b4e612610ecec540bb176043CAS |
Parsons AJ, Edwards GR, Newton PCD, Chapman DF, Caradus JR, Rasmussen S, Rowarth JS (2011) Past lessons and future prospects: plant breeding for yield and persistence in cool-temperate pastures. Grass and Forage Science 66, 153–172.
| Past lessons and future prospects: plant breeding for yield and persistence in cool-temperate pastures.Crossref | GoogleScholarGoogle Scholar |
Poland JA, Rife TW (2012) Genotyping-by-sequencing for plant breeding and genetics. The Plant Genome 5, 92–102.
| Genotyping-by-sequencing for plant breeding and genetics.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3sXlvVaksr8%3D&md5=987232a6e0b8e163832f78906da1a160CAS |
Poland J, Endelman J, Dawson J, Rutkoski J, Wu S, Manes Y, Dreisigacker S, Crossa J, Sánchez-Villeda H, Sorrells M, Jannink J-L (2012) Genomic selection in wheat breeding using genotyping-by-sequencing. The Plant Genome 5, 103–113.
| Genomic selection in wheat breeding using genotyping-by-sequencing.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3sXlvVaksrw%3D&md5=f481d5c94b893cd6ec101f8ff2de3a39CAS |
Popay AJ, Thom ER (2009) Endophyte effects on major insect pests in Waikato dairy pasture. Proceedings of the New Zealand Grassland Association 71, 121–126.
Popay AJ, Prestidge RA, Rowan DD, Dymock JJ (1990) The role of Acremonium lolii mycotoxins in insect resistance of perennial ryegrass (Lolium perenne). In ‘Proceedings of the international symposium on Acremonium/grass interactions’. (Eds SS Quisenberry, RE Joost)
Pownall DB, Familton AS, Field RJ, Fletcher LR, Lane GA (1995) Brief communication: the effect of peramine ingestion in pen-fed lambs. Proceedings of the New Zealand Society of Animal Production 55, 186
Prestidge RA, Gallagher RT (1988) Endophyte fungus confers resistance to ryegrass: Argentine stem weevil larval studies. Ecological Entomology 13, 429–435.
| Endophyte fungus confers resistance to ryegrass: Argentine stem weevil larval studies.Crossref | GoogleScholarGoogle Scholar |
Pryce JE, Gonzalez-Recio O, Thornhill JB, Marett LC, Wales WJ, Coffey MP, de Haas Y, Veerkamp RF, Hayes BJ (2014) Short communication: validation of genomic breeding value predictions for feed intake and feed efficiency traits. Journal of Dairy Science 97, 537–542.
| Short communication: validation of genomic breeding value predictions for feed intake and feed efficiency traits.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3sXhslOlsbjF&md5=b017b4646b76087ea255d040a8283e44CAS | 24239085PubMed |
Pullanagari RR, Yule IJ, Tuohy MP, Hedley MJ, Dynes RA, King WM (2013) Proximal sensing of the seasonal variability of pasture nutritive value using multispectral radiometry. Grass and Forage Science 68, 110–119.
| Proximal sensing of the seasonal variability of pasture nutritive value using multispectral radiometry.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3sXitVOitr8%3D&md5=95dd3a8ac85a101100491501eaf9deabCAS |
Rasmussen S, Thornley JHM, Parsons AJ, Harrison SJ (2013) Mathematical model of fructan biosynthesis and polymer length distribution in plants. Annals of Botany 111, 1219–1231.
| Mathematical model of fructan biosynthesis and polymer length distribution in plants.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3sXoslWjsrk%3D&md5=e73aff25ce90d58ab55bc4bc67820702CAS | 23644360PubMed |
Rasmussen S, Parsons AJ, Xue H, Liu Q, Jones CS, Ryan GD, Newman JA (2014) Transcript profiling of fructan biosynthetic pathway genes reveals association of a specific fructosyltransferase isoform with the high sugar trait in Lolium perenne. Journal of Plant Physiology 171, 475–485.
Reed KFM, Walsh JR, Cross PA, McFarlane NM, Sprague MA (2004) Ryegrass endophyte (Neotyphodium lolii) alkaloids and mineral concentrations in perennial ryegrass (Lolium perenne) from southwest Victorian pasture. Australian Journal of Experimental Agriculture 44, 1185–1194.
| Ryegrass endophyte (Neotyphodium lolii) alkaloids and mineral concentrations in perennial ryegrass (Lolium perenne) from southwest Victorian pasture.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD2MXmsVOnsw%3D%3D&md5=5f12adf950c75fa46e4fa6f2c53d3fadCAS |
Resende RMS, Casler MD, Vilela de Resende MD (2013) Selection methods in forage breeding: a quantitative appraisal. Crop Science 53, 1925–1936.
| Selection methods in forage breeding: a quantitative appraisal.Crossref | GoogleScholarGoogle Scholar |
Resende RMS, Casler MD, de Resende MDV (2014) Genomic selection in forage breeding: accuracy and methods. Crop Science 54, 143–156.
| Genomic selection in forage breeding: accuracy and methods.Crossref | GoogleScholarGoogle Scholar |
Riedelsheimer C, Melchinger A (2013) Optimizing the allocation of resources for genomic selection in one breeding cycle. Theoretical and Applied Genetics 126, 2835–2848.
| Optimizing the allocation of resources for genomic selection in one breeding cycle.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3sXhslWhur%2FO&md5=a856f15d127bddce11fea16865a5f677CAS | 23982591PubMed |
Rivas L, Holmann F (2005) Potential economic impact from the adoption of Brachiaria hybrids resistant to spittlebugs in livestock systems of Colombia, Mexico and Central America. Livestock Research for Rural Development 17, 54
Rowan DD, Dymock JJ, Brimble MA (1990) Effect of fungal metabolite peramine and analogs on feeding and development of Argentine stem weevil (Listronotus bonariensis). Journal of Chemical Ecology 16, 1683–1695.
| Effect of fungal metabolite peramine and analogs on feeding and development of Argentine stem weevil (Listronotus bonariensis).Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DyaK3cXlsVOhsro%3D&md5=146388e1814567e3c91ffc7dcb9fded9CAS | 24263837PubMed |
Sakamoto M, Sanada Y, Tagiri A, Murakami T, Ohashi Y, Matsuoka M (1991) Structure and characterization of a gene for light-harvesting chi a/b binding protein from rice. Plant & Cell Physiology 32, 385–393.
Schardl CL, Young CA, Pan J, Florea S, Takach JE, Panaccione DG, Farman ML, Webb JS, Jaromczyk J, Charlton ND, Nagabhyru P, Chen L, Shi C, Leuchtmann A (2013) Currencies of mutualisms: sources of alkaloid genes in vertically transmitted epichloae. Toxins 5, 1064–1088.
| Currencies of mutualisms: sources of alkaloid genes in vertically transmitted epichloae.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3sXhtVSku7rM&md5=6ea5105a9abcbdef01fe285af31d40bdCAS | 23744053PubMed |
Simpson WR, Mace WJ, Young CA, Aiken GE, McCulley RL, Strickland JR, Schardl CL (2012) Novel associations between epichloid endophytes and grasses: possibilities and outcomes. In ‘7th international symposium on fungal endophytes of grasses’, Lexington, Kentucky. (Eds CA Young, GE Aiken, RL McCulley, JR Strickland, CL Schardl) pp. 35–39. (Samuel Roberts Noble Foundation: Ardmore, OK)
Simpson WR, Faville MJ, Moraga RA, Williams WM, McManus MT, Johnson RD (2014) Epichloë fungal endophytes and the formation of synthetic symbioses in Hordeeae (=Triticeae) grasses. Journal of Systematics and Evolution 52, 794–806.
| Epichloë fungal endophytes and the formation of synthetic symbioses in Hordeeae (=Triticeae) grasses.Crossref | GoogleScholarGoogle Scholar |
Smith P, Martino D, Cai Z, Gwary D, Janzen H, Kumar P, McCarl B, Ogle S, O’Mara F, Rice C, Scholes B, Sirotenko O, Howden M, McAllister T, Pan G, Romanenkov V, Schneider U, Towprayoon S, Wattenbach M, Smith J (2008) Greenhouse gas mitigation in agriculture. Philosophical Transactions of the Royal Society B: Biological Sciences 363, 789–813.
| Greenhouse gas mitigation in agriculture.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD1cXislGgtb8%3D&md5=abf8d8e59f913454f43afdacca301edbCAS |
Spindel J, Begum H, Akdemir D, Virk P, Collard B, Redoña E, Atlin G, Jannink J-L, McCouch SR (2015) Genomic selection and association mapping in rice (Oryza sativa): effect of trait genetic architecture, training population composition, marker number and statistical model on accuracy of rice genomic selection in elite, tropical rice breeding lines. PLOS Genetics 11, e1004982
| Genomic selection and association mapping in rice (Oryza sativa): effect of trait genetic architecture, training population composition, marker number and statistical model on accuracy of rice genomic selection in elite, tropical rice breeding lines.Crossref | GoogleScholarGoogle Scholar | 25689273PubMed |
Tapper BA, Latch GCM (1999) Selection against toxin production in endophyte-infected perennial ryegrass. Ryegrass endophyte: an essential New Zealand symbiosis. Grassland research and practice series 7, 107–111.
Thomas HM, Morgan WG, Humphreys MW (2003) Designing grasses with a future: combining the attributes of Lolium and Festuca. Euphytica 133, 19–26.
| Designing grasses with a future: combining the attributes of Lolium and Festuca.Crossref | GoogleScholarGoogle Scholar |
Tian P, Le TN, Ludlow EJ, Smith KF, Forster JW, Guthridge KM, Spangenberg GC (2013a) Characterisation of novel perennial ryegrass host-Neotyphodium endophyte associations. Crop and Pasture Science 64, 716–725.
| Characterisation of novel perennial ryegrass host-Neotyphodium endophyte associations.Crossref | GoogleScholarGoogle Scholar |
Tian P, Le TN, Smith KF, Forster JW, Guthridge KM, Spangenberg GC (2013b) Stability and viability of novel perennial ryegrass host-Neotyphodium endophyte associations. Crop and Pasture Science 64, 39–50.
| Stability and viability of novel perennial ryegrass host-Neotyphodium endophyte associations.Crossref | GoogleScholarGoogle Scholar |
Valentine S, Bartsch B, Carroll P (1993) Production and composition of milk by dairy cattle grazing high and low endophyte cultivars of perennial ryegrass. In ‘Proceedings of the second international symposium on Acremonium/grass interactions’. (Eds DE Hume, GCM Latch, HS Easton) pp. 138–141. (AgResearch Grasslands Research Centre: Palmerston North, New Zealand)
Van Eenennaam AL, Young AE (2014) Prevalence and impacts of genetically engineered feedstuffs on livestock populations. Journal of Animal Science 92, 4255–4278.
| Prevalence and impacts of genetically engineered feedstuffs on livestock populations.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC2cXhvFKrtr%2FN&md5=fb23276bcbaae8ea592f8886240f9330CAS | 25184846PubMed |
Walter A, Studer B, Kölliker R (2012) Advanced phenotyping offers opportunities for improved breeding of forage and turf species. Annals of Botany 110, 1271–1279.
| Advanced phenotyping offers opportunities for improved breeding of forage and turf species.Crossref | GoogleScholarGoogle Scholar | 22362662PubMed |
White JW, Conley MM (2013) A flexible, low-cost cart for proximal sensing. Crop Science 53, 1646–1649.
| A flexible, low-cost cart for proximal sensing.Crossref | GoogleScholarGoogle Scholar |
White JW, Andrade-Sanchez P, Gore MA, Bronson KF, Coffelt TA, Conley MM, Feldmann KA, French AN, Heun JT, Hunsaker DJ, Jenks MA, Kimball BA, Roth RL, Strand RJ, Thorp KR, Wall GW, Wang G (2012) Field-based phenomics for plant genetics research. Field Crops Research 133, 101–112.
| Field-based phenomics for plant genetics research.Crossref | GoogleScholarGoogle Scholar |
Williams WM, Easton HS, Jones CS (2007) Future options and targets for pasture plant breeding in New Zealand. New Zealand Journal of Agricultural Research 50, 223–248.
| Future options and targets for pasture plant breeding in New Zealand.Crossref | GoogleScholarGoogle Scholar |
Williams W, Verry I, Ansari H, Hussain S, Ullah I, Williamson M, Ellison N (2011) Eco-geographically divergent diploids, Caucasian clover (Trifolium ambiguum) and western clover (T. occidentale) retain most requirements for hybridisation. Annals of Botany 108, 1269–1277.
| Eco-geographically divergent diploids, Caucasian clover (Trifolium ambiguum) and western clover (T. occidentale) retain most requirements for hybridisation.Crossref | GoogleScholarGoogle Scholar | 21880661PubMed |
Williams W, Ellison N, Ansari H, Verry I, Hussain S (2012) Experimental evidence for the ancestry of allotetraploid Trifolium repens and creation of synthetic forms with value for plant breeding. BMC Plant Biology 12, 55
| Experimental evidence for the ancestry of allotetraploid Trifolium repens and creation of synthetic forms with value for plant breeding.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3sXot1WltLo%3D&md5=36cc4cebe60eb05c24892655ce739e95CAS | 22530692PubMed |
Winichayakul S, Scott RW, Roldan M, Hatier J-HB, Livingston S, Cookson R, Curran AC, Roberts NJ (2013) In vivo packaging of triacylglycerols enhances Arabidopsis leaf biomass and energy density. Plant Physiology 162, 626–639.
| In vivo packaging of triacylglycerols enhances Arabidopsis leaf biomass and energy density.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3sXps1Oru78%3D&md5=4b9723adcbcc6a46dcb85c77f4d84cc7CAS | 23616604PubMed |
Woodfield DR (1999) Genetic improvements in New Zealand forage cultivars. Proceedings of the New Zealand Grasslands Association 61, 3–7.
Zhao Q, Dixon RA (2014) Altering the cell wall and its impact on plant disease: from forage to bioenergy. Annual Review of Phytopathology 52, 69–91.
| Altering the cell wall and its impact on plant disease: from forage to bioenergy.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC2cXhsl2msrfJ&md5=0dcc538d6b4cd5f3d7eaeef9b844f688CAS | 24821183PubMed |
