Distribution, habitat, morphological diversity and genetic interrelations of native Vigna in the Pilbara, Western Australia
R. J. Lawn
A B C and A. Cottrell B
A CSIRO Agriculture, ATSIP, James Cook University, Townsville, Qld 4811, Australia.
B Science and Engineering, James Cook University, Townsville, Qld 4811, Australia.
C Corresponding author. Emails: bob.lawn@csiro.au; robert.lawn@jcu.edu.au
Crop and Pasture Science 69(10) 985-998 https://doi.org/10.1071/CP18110
Submitted: 22 March 2018 Accepted: 21 August 2018 Published: 5 September 2018
Abstract
A 2-week road trip was made through the Pilbara region to collect seed of native Vigna species. Thirty-two new accessions were collected, all of which were within what can be broadly described as the V. lanceolata Benth. complex. All 32 accessions were amphicarpic, rhizomatous, trailing or vining perennials. The largest and most widely distributed group of 21 accessions belonged to the Silverleaf morphotype and a further nine accessions belonged to the Central morphotype. Two accessions from the Karratha region were of a recently described diminutive species, V. triodiophila. The Silverleaf accessions were all collected from grassy woodlands on river levees and alluvial floodplains. The Central accessions were collected from a more diverse range of habitats, albeit again mostly in wetter or ‘run-on’ parts of the landscape. Measurements of selected traits on a subset of accessions grown for seed increase in Townsville indicated that the Pilbara Silverleaf and Central accessions were comparable with accessions of these morphotypes from elsewhere in northern Australia. Healthy, viable F1 hybrids were readily obtained from crosses between accessions from all three Vigna groups collected from the Pilbara, indicating that all belong to same primary gene pool. This includes V. triodiophila, notwithstanding its taxonomy. Healthy, viable and fertile F1 hybrids were also obtained between the Pilbara accessions of both the Silverleaf and Central morphotypes and respective accessions of these morphotypes from elsewhere in northern Australia. The F1 hybrids between V. triodiophila and both the Silverleaf and the Central accessions exhibited near-normal plant phenotype in terms of the size of their vegetative and reproductive structures, indicating that the diminutive size of V. triodiophila is a recessive trait. The most plausible explanation is that V. triodiophila is a dwarf variant of the Central morphotype, which it most closely resembles apart from its size. The fact that the F1 hybrids between V. triodiophila and two Pilbara Central accessions were fully self-fertile supports that conclusion, while the recovery of dwarf segregants from small numbers of F2 and backcross progeny from one of the crosses indicates that the dwarf trait may involve just a single gene. These 32 new accessions extend the range of climatic and edaphic environments, especially at the harsher end, from which accessions of V. lanceolata have been collected and seeds conserved.
Additional keywords: biodiversity, crop wild relatives, dwarfism, forage legumes, germplasm resources, native pasture legumes.
References
Atlas of Living Australia (2017) Atlas of living Australia. NICRIC/CSIRO. Available at: http://www.ala.org.au/species-by-location/ (accessed 8 May 2017)BoM (2017) Climate Data Online. Bureau of Meteorology, Australian Government. Available at: http://www.bom.gov.au/climate/data/index.shtml (accessed 8 May 2017).
Busov VB, Brunner AM, Strauss SH (2008) Genes for control of plant stature and form. New Phytologist 177, 589–607.
| Genes for control of plant stature and form.Crossref | GoogleScholarGoogle Scholar |
Butcher R, Dillon SJ (2016) Vigna sp. central (M.E. Trudgen 1626) is not distinct from V. sp. Hammersley Clay (A.A. Mitchell PRP 113). Nuytsia 27, 31–32.
Cocks PS (1999) Reproductive strategies and genetic structure of wild and naturalised legume populations. In ‘Genetic resources of Mediterranean pasture and forage legumes’. Ch. 2. (Eds SJ Bennett, PS Cocks) pp. 20–28. (Kluwer Academic Publishers: Dordrecht, The Netherlands)
Department of Agriculture & Water Resources (2017) Australia: Country Report on the implementation of the International Treaty on Plant Genetic Resources for Food and Agriculture (ITPGRFA), 27 Feb 2017. Food and Agriculture Organization of the United Nations. Available at: http://www.fao.org/3/a-br584e.pdf (accessed 15 October 2017)
Dreber N, Esler KJ (2011) Spatio-temporal variation in soil seed banks under contrasting grazing regimes following low and high seasonal rainfall in arid Namibia. Journal of Arid Environments 75, 174–184.
| Spatio-temporal variation in soil seed banks under contrasting grazing regimes following low and high seasonal rainfall in arid Namibia.Crossref | GoogleScholarGoogle Scholar |
Fery RL (2002) New opportunities in Vigna. In ‘Trends in new crops and new uses’. (Eds J Janick, A Whipkey) pp. 424–428. (American Society for Horticultural Science Press: Alexandria, VA, USA) Available at: https://www.hort.purdue.edu/newcrop/ncnu02/v5-424.html (accessed 15 October 2017)
Holland AE, Butcher R (2016) Vigna triodiophila (Fabaceae: Phaseoleae), a new conservation-listed species from the Pilbara, Western Australia. Nuytsia 27, 77–83.
Humphreys LR (1980) Deficiencies of adaptation of pasture legumes. Tropical Grasslands 14, 153–158.
Landsberg J, Lavorel S, Stol J (1999) Grazing response groups among understorey plants in arid rangelands. Journal of Vegetation Science 10, 683–696.
| Grazing response groups among understorey plants in arid rangelands.Crossref | GoogleScholarGoogle Scholar |
Lawn RJ (2015) The Australian Vigna species: A case study in the collection and conservation of crop wild relatives. In ‘Crop wild relatives and climate change’. Ch. 18. (Eds R Redden, SS Yadav, N Maxted, Md E Dulloo, L Guarino, P Smith) pp. 318–335. (John Wiley & Sons: Hoboken, NJ, USA)
Lawn RJ, Bielig LM (2016) Expression of amphicarpy in Vigna lanceolata morphotypes and their hybrids and implications for breeding improved cultivars. Crop & Pasture Science 67, 978–987.
| Expression of amphicarpy in Vigna lanceolata morphotypes and their hybrids and implications for breeding improved cultivars.Crossref | GoogleScholarGoogle Scholar |
Lawn RJ, Cottrell A (1988) Wild mungbean and its relatives in Australia. Biologist 35, 267–273.
Lawn RJ, Holland AE (2003) Variation in the Vigna lanceolata Benth. complex for traits of taxonomic, adaptive or agronomic interest. Australian Journal of Botany 51, 295–308.
| Variation in the Vigna lanceolata Benth. complex for traits of taxonomic, adaptive or agronomic interest.Crossref | GoogleScholarGoogle Scholar |
Lawn RJ, Watkinson AR (2002) Habitat, morphological diversity and distribution of the genus Vigna Savi in Australia. Australian Journal of Agricultural Research 53, 1305–1316.
| Habitat, morphological diversity and distribution of the genus Vigna Savi in Australia.Crossref | GoogleScholarGoogle Scholar |
Lawn RJ, Vu HTT, Bielig LM, Kilian A (2016) Genetic compatibility among morphotypes of Vigna lanceolata and implications for breeding improved cultivars. Crop & Pasture Science 67, 739–750.
Maxted N, Mabuza-Diamini P, Moss H, Padulosi S, Jarvis A, Guarino L (2004) ‘Systematic and ecogeographic studies on crop genepools: 11. An ecogeographic study African Vigna.’ (International Plant Genetic Resources Institute: Rome)
Norton SL, Khoury CK, Sosa CC, Castañeda-Álvarez NP, Achicanoy HA, Sotelo S (2017) Priorities for enhancing the ex situ conservation and use of Australian crop wild relatives. Australian Journal of Botany 65, 638–645.
| Priorities for enhancing the ex situ conservation and use of Australian crop wild relatives.Crossref | GoogleScholarGoogle Scholar |
Nwokolo E, Smartt J (Eds) (1996) ‘Food and feed from legumes and oilseeds.’ (Chapman and Hall: London)
Ross JJ, Murfet IC, Reid JB (1997) Gibberellin mutants. Physiologia Plantarum 100, 550–560.
| Gibberellin mutants.Crossref | GoogleScholarGoogle Scholar |
Saravana Kumar P, Lawn RJ, Bielig LM (2012) Comparative studies on reproductive structures in four amphicarpic tropical Phaseoleae legumes. Crop & Pasture Science 63, 570–581.
| Comparative studies on reproductive structures in four amphicarpic tropical Phaseoleae legumes.Crossref | GoogleScholarGoogle Scholar |
Van Vreeswyk AME, Payne AL, Leighton KA, Hennig P (2004a) An inventory and condition survey of the Pilbara region, Western Australia. Technical Bulletin No. 92. Department of Agriculture, Western Australia, South Perth, W. Aust.
Van Vreeswyk AME, Payne AL, Leighton KA (2004b) Pastoral resources and their management in the Pilbara region of Western Australia. Miscellaneous Publication 21/2004. Department of Agriculture, Western Australia, South Perth, W. Aust.
