摘要
Carbon isotope discrimination（△13C） is considered a useful indicator for indirect selection of grain yield（GY） in cereals.Therefore,it is important to evaluate the genetic variation in △13C and its relationship with GY.A doubled haploid（DH） population derived from a cross of two common wheat varieties,Hanxuan 10（H10） and Lumai 14（L14）,was phenotyped for △13C in the flag leaf,GY and yield associated traits in two trials contrasted by water availability,specifically,rain-fed and irrigated.Quantitative trait loci（QTLs） were identified by single locus and two locus QTL analyses.QTLs for △13C were located on chromosomes 1A,2B,3B,5A,7A and 7B,and QTLs for other traits on all chromosomes except 1A,4D,5A,5B and 6D.The population selected for high △13C had an increased frequency of QTL for high △13C,GY and number of spikes per plant（NSP） when grown under rain-fed conditions and only for high △13C and NSP when grown under irrigated conditions,which was consistent with agronomic performance of the corresponding trait values in the high △13C progeny;that is,significantly greater than that in the low △13C.Therefore,selection for △13C was beneficial in increasing grain yield in rain-fed environments.
Carbon isotope discrimination（△13C） is considered a useful indicator for indirect selection of grain yield（GY） in cereals.Therefore,it is important to evaluate the genetic variation in △13C and its relationship with GY.A doubled haploid（DH） population derived from a cross of two common wheat varieties,Hanxuan 10（H10） and Lumai 14（L14）,was phenotyped for △13C in the flag leaf,GY and yield associated traits in two trials contrasted by water availability,specifically,rain-fed and irrigated.Quantitative trait loci（QTLs） were identified by single locus and two locus QTL analyses.QTLs for △13C were located on chromosomes 1A,2B,3B,5A,7A and 7B,and QTLs for other traits on all chromosomes except 1A,4D,5A,5B and 6D.The population selected for high △13C had an increased frequency of QTL for high △13C,GY and number of spikes per plant（NSP） when grown under rain-fed conditions and only for high △13C and NSP when grown under irrigated conditions,which was consistent with agronomic performance of the corresponding trait values in the high △13C progeny;that is,significantly greater than that in the low △13C.Therefore,selection for △13C was beneficial in increasing grain yield in rain-fed environments.
基金
supported by the State Key Basic Research & Development Plan of China (2010CB951501)
the CGIAR Generation Challenge Program (G7010.02.01)
