Mapping of a gene (Vir) for a non-glaucous, viridescent phenotype in bread wheat derived from Triticum dicoccoides, and its association with yield variation
- 312 Downloads
The introgression of desirable genes or alleles from the wild relatives of hexaploid wheat can be a valuable source of genetic variation for wheat breeders to enhance modern varieties. The UK Group 1 bread making variety Shamrock is an example where the introgression of genetic material from wild emmer (Triticum dicoccoides) has been used to develop a modern cultivar. A striking character of Shamrock is its unique viridescent colour compared to other UK wheats, a trait that coincides with a non-glaucous phenotype. A doubled haploid population segregating for the trait (Shamrock × Shango) was examined to map the location of Vir, and analyse any associated pleiotropic effects. The viridescence gene located to the distal end of the short arm of chromosome 2B. QTL analysis of productivity traits shows an association between Vir and a significant delay in senescence, resulting in an extension of the grain filling period. A stable yield QTL, accounting for up to a quarter of the variation in one case, was also identified at or near Vir, indicating significant yield benefits either by linkage or pleiotropy.
KeywordsGlaucosity Stay-green Triticum dicoccoides Viridescence Wheat Yield
We would like to thank the Department for Environment, Food and Rural Affairs (DEFRA) and the Biotechnology and Biological Sciences Research Council (BBSRC) for their financial assistance through the LINK project “Investigating Wheat Functionality through Breeding and End-use” (FQS23). We are also grateful to Syngenta Crop Protection UK Limited and RAGT Seeds Ltd for their contributions to the phenotype data for this study. JIC is sponsored by the UK Biotechnology and Biological Sciences Research Council.
- Carver BF, Johnson RC, Rayburn AL (1989) Genetic analysis of photosynthetic variation in hexaploid and tetraploid wheat and their interspecific hybrids. Photosynth Res 20:105–118Google Scholar
- Evans LT (1993) Crop evolution, adaptation and yield. Cambridge University Press, Cambridge, UKGoogle Scholar
- Evans LT, Dunstone RL (1970) Some physiological aspects of evolution in wheat. Aust J Biol Sci 26:295–307Google Scholar
- Grama A, Gerechter-Amitai ZK, Blum A (1983) Wild emmer as a donor of genes for resistance to stripe rust and for high protein content. In: Sakamoto S (ed) Proc 6th Int Wheat Genet Symp, Kyoto, Japan: Plant Germplasm Institute, University of Kyoto, 187–192Google Scholar
- NIAB (2002) Pocket guide to varieties of cereals, oilseeds and pulses—Autumn 2002. Cambridge Marketing LimitedGoogle Scholar
- Richards RA, Rawson HM, Johnson DA (1986) Glaucousness in wheat: its development and effect on water-use efficiency, gas exchange and photosynthetic tissue temperatures. Aust J Plant Physiol 13:465–473Google Scholar
- Thomas H, Howarth CJ (2000) Five ways to stay green. J Exp Biol 51:329–337Google Scholar