Inheritance of coleoptile tiller appearance and size in wheat
G. J. Rebetzke A E , C. López-Castañeda B C , T. L. Botwright Acuña A D , A. G. Condon A and R. A. Richards AA CSIRO Plant Industry, PO Box 1600, Canberra, ACT 2601, Australia.
B Especialidad de Genética, IRGP, Colegio de Postgraduados, Montecillo 56230, Mexico.
C Present address: Department of Botany and Plant Science, University of California, Riverside, CA 92521-0124, USA.
D Tasmanian Institute of Agricultural Research, University of Tasmania, Private Bag 54, Hobart, Tas. 7001, Australia.
E Corresponding author. Email: Greg.Rebetzke@csiro.au
Australian Journal of Agricultural Research 59(9) 863-873 https://doi.org/10.1071/AR07397
Submitted: 22 October 2007 Accepted: 4 June 2008 Published: 26 August 2008
Abstract
Selection for rapid leaf area growth has the potential to increase wheat biomass, and both water-use efficiency and weed competitiveness early in the season. Several morphological components contribute to increased seedling leaf area, including rapid seedling emergence and production of longer, wider leaves. Early emergence of a large coleoptile tiller has also been demonstrated to increase plant leaf area and biomass in wheat and other grass seedlings. Yet little is known of the extent and nature of genotypic variation for coleoptile tiller growth in wheat. A random set of 35 wheat, barley, and triticale genotypes was evaluated in glasshouse and outdoor studies for seedling characteristics, including coleoptile tiller growth and total plant leaf area. Coleoptile tillers were produced more reliably for seedlings grown outdoors and when supplied with additional soil nitrogen. Genotypic differences in coleoptile tiller frequency and leaf area were large, ranging from 0 to 78% and from 0.0 to 1.4 cm2, respectively at very early growth stages. Australian commercial wheats tended to produce fewer coleoptile tillers of smaller size than overseas germplasm where the coleoptile tiller accounted for up to 12% of total seedling leaf area. This compared favourably with mainstem tiller leaf area, which ranged from 0 to 3.5 cm2 and accounted for up to 16% of plant leaf area. Broad-sense heritabilities were high for coleoptile tiller presence and size in favourable conditions (c. 75%) but low (c. 40%) for seedlings evaluated across nitrogen content-varying soils. Generation means analysis was used to investigate genetic control for coleoptile tiller growth across multiple populations. Significant (P < 0.05) differences were observed among generations for coleoptile tiller frequency and growth (numbers of leaves, leaf area, and biomass). These differences reflected strong additive genetic control with little evidence for any gene action × year interaction. Increases in coleoptile tiller frequency and mass were correlated with larger embryo size and wider seedling leaves to increase seedling leaf area (rg = 0.89). Comparisons between reciprocal F1 and F2 generation means indicated strong maternal effects for coleoptile tiller growth in some but not all crosses. Screening in favourable environments will increase heritability and aid in selection for progenies producing large coleoptile tillers. Evidence for additive genetic control should permit early generation selection but not without some progeny-testing for coleoptile tiller growth together with other early vigour components associated with increased plant leaf area.
Acknowledgments
We thank Xavier Sirault for helpful discussions, and both Bernie Mickelson and Kelley Whisson for assistance with technical aspects related to this research.
Aparicio N,
Villegas D,
Araus JL,
Blanco R, Royo C
(2002) Seedling development and biomass as affected by seed size and morphology in durum wheat. Journal of Agricultural Science, Cambridge 139, 143–150.
| Crossref | GoogleScholarGoogle Scholar |
Araki H, Iijima M
(2001) Deep rooting in winter wheat: rooting nodes of deep roots in two cultivars with deep and shallow root systems. Plant Production Science 4, 215–219.
| PubMed |
Botwright TL,
Condon AG,
Rebetzke GJ, Richards RA
(2002) Field evaluation of early vigour for genetic improvement of grain yield in wheat. Australian Journal of Agricultural Research 53, 1137–1145.
| Crossref | GoogleScholarGoogle Scholar |
Cannell RQ
(1969) The tillering pattern in barley varieties II. The effect of temperature, light intensity and daylength on the frequency of occurrence of the coleoptile node and second tillers in barley. Journal of Agricultural Science, Cambridge 72, 423–435.
Coleman RK,
Gill GS, Rebetzke GJ
(2001) Identification of quantitative trait loci (QTL) for traits conferring weed competitiveness in wheat (Triticum aestivum L.). Australian Journal of Agricultural Research 52, 1235–1246.
| Crossref | GoogleScholarGoogle Scholar |
Faulkner JS,
Johnston F, McAneney DMP
(1982) Selection for seedling vigour in Festuca arundinacea. Journal of Agricultural Science, Cambridge 99, 173–184.
Frank AB, Bauer A
(1982) Effect of temperature and fertiliser N on apex development in spring wheat. Agronomy Journal 74, 504–509.
Fujita R,
Ueno K, Yamazaki K
(2000) The development of coleoptile tillers in relation to seedling vigor in early-maturing varieties of spring type wheat. Plant Production Science 3, 275–280.
Krenzer EG,
Nipp TL, McNew RW
(1991) Winter wheat mainstem leaf appearance and tiller formation vs. moisture treatment. Agronomy Journal 83, 663–667.
Lewis EJ, Garcia JA
(1979) The effect of seed weight and coleoptile tiller development on seedling vigour in tall fescue, Festuca arundinacea Screb. Euphytica 28, 393–402.
| Crossref | GoogleScholarGoogle Scholar |
Liang YL, Richards RA
(1994) Coleoptile tiller development is associated with fast early vigour in wheat. Euphytica 80, 119–124.
| Crossref | GoogleScholarGoogle Scholar |
Liao M,
Fillery IRP, Palta JA
(2004) Early vigorous growth is a major factor influencing nitrogen uptake in wheat. Functional Plant Biology 31, 121–129.
| Crossref | GoogleScholarGoogle Scholar |
López-Castañeda C, Richards RA
(1994) Variation in temperate cereals in rainfed environments III. Water use and water-use efficiency. Field Crops Research 39, 85–98.
| Crossref | GoogleScholarGoogle Scholar |
López-Castañeda C,
Richards RA,
Farquhar GD, Williamson RE
(1996) Seed and seedling characteristics contributing to variation in early vigor among temperate cereals. Crop Science 36, 1257–1266.
Pandey MP,
Seshu DV, Akbar M
(1994) Genetics of embryo size and its relationship with seed and seedling vigour in rice (Oryza sativa L.). Indian Journal of Genetics and Plant Breeding 54, 258–268.
Peterson CM,
Klepper B, Rickman RW
(1982) Tiller development at the coleoptilar node in winter wheat. Agronomy Journal 74, 781–784.
Rawson HM
(1971) Tillering patterns in wheat with special reference to the shoot at the coleoptilar node. Australian Journal of Biological Sciences 24, 829–841.
Rebetzke GJ,
Appels R,
Morrison A,
Richards RA,
McDonald G,
Ellis MH,
Spielmeyer W, Bonnett DG
(2001) Quantitative trait loci on chromosome 4B for coleoptile length and early vigour in wheat (Triticum aestivum L.). Australian Journal of Agricultural Research 52, 1221–1234.
| Crossref | GoogleScholarGoogle Scholar |
Rebetzke GJ,
Botwright TL,
Moore CS,
Richards RA, Condon AG
(2004) Genotypic variation in specific leaf area for genetic improvement of early vigour in wheat. Field Crops Research 88, 179–189.
| Crossref | GoogleScholarGoogle Scholar |
Rebetzke GJ, Richards RA
(1999) Genetic improvement of early vigour in wheat. Australian Journal of Agricultural Research 50, 291–301.
| Crossref | GoogleScholarGoogle Scholar |
Rebetzke GJ,
Richards RA,
Fettell NA,
Long M,
Condon AG, Botwright TL
(2007) Genotypic increases in coleoptile length improves wheat establishment, early vigour and grain yield with deep sowing. Field Crops Research 100, 10–23.
| Crossref | GoogleScholarGoogle Scholar |
Regan KL,
Siddique KHM,
Tennant D, Abrecht DG
(1997) Grain yield and water use efficiency of early maturing wheat in low rainfall Mediterranean environments. Australian Journal of Agricultural Research 48, 595–603.
| Crossref | GoogleScholarGoogle Scholar |
Richards RA, Lukacs Z
(2002) Seedling vigour in wheat-sources of variation for genetic and agronomic improvement. Australian Journal of Agricultural Research 53, 41–50.
| Crossref | GoogleScholarGoogle Scholar |
Skinner RH, Nelson CJ
(1994) Role of leaf appearance rate and the coleoptile tiller in regulating tiller production. Crop Science 34, 71–75.
Stapper M, Fischer RA
(1990) Genotype, sowing date and plant spacing influence on high-yielding irrigated wheat in southern New South Wales. I Phasic development, canopy growth and spike production. Australian Journal of Agricultural Research 41, 997–1019.
| Crossref | GoogleScholarGoogle Scholar |
Whan BR,
Carlton GP, Anderson WK
(1991) Potential for increasing early vigour and total biomass in spring wheat. I. Identification of genetic improvements. Australian Journal of Agricultural Research 42, 347–361.
| Crossref | GoogleScholarGoogle Scholar |
Wilkins DE,
Klepper BL, Rickman RW
(1989) Measuring wheat seedling response to tillage and seeding systems. Transactions of the American Society of Agricultural Engineers 32, 795–800.
Williams RF, Metcalf RA
(1975) Physical constraint and tiller growth in wheat. Australian Journal of Botany 23, 213–223.
| Crossref | GoogleScholarGoogle Scholar |
