QTL identified for stay-green in a multi-reference nested association mapping population of wheat exhibit context dependent expression and parent-specific alleles

A stay-green phenotype is useful for adaptation of wheat to end-of-season drought conditions. We identified quantitative trait loci (QTL) traits, as well height, days anthesis and yield, in a multi-reference nested association mapping (MR-NAM) population (Triticum aestivum L.) two environments differing degree stress experienced post-anthesis. The MR-NAM consisted three inter-related populations developed by nesting 11 diverse donors within common reference parents, adapted the northern, southern western cropping regions Australia, respectively. construction enables assessment effect on multiple alleles at any particular locus, different genetic backgrounds, facilitates concurrent QTL germplasm development. This approach enabled identification parent-specific context dependent expression. Using new statistical method specifically identify populations, we 65 traits. Co-location was observed between (i) associations some (ii) environments, (iii) plant height grain yield. Some co-located with those other studies however, others are likely novel. Genetic markers associated can be applied breeding enrich traits early generations selection, prior field testing yield plots, development cultivars targeted drought-stressed environments. information important breeders, because it sources most promising specific backgrounds growing