以我国大面积种植的典型旱地作物甘薯为研究对象,进行可控条件的不同水分处理的盆栽试验,研究了水分胁迫下甘薯各典型生育期各器官碳同位素判别值(Δ13C)、水分利用效率(WUE)及其之间的关系。试验设3个水分条件:分别为田间持水量的50%(W...以我国大面积种植的典型旱地作物甘薯为研究对象,进行可控条件的不同水分处理的盆栽试验,研究了水分胁迫下甘薯各典型生育期各器官碳同位素判别值(Δ13C)、水分利用效率(WUE)及其之间的关系。试验设3个水分条件:分别为田间持水量的50%(W1),75%(W2),100%(W3)。结果表明,各生育期各器官生物量均随着水分增加而增加,在W3处理时达到最大,各生育期WUE则在W1处理时达到最大。尽管W3处理最终总生物量积累及产量最高,但高水分处理下将降低光合同化物向地下部的分配比例;同时,甘薯光合速率和Ru Bis CO活性之间呈正相关关系;甘薯不同生育期不同部位的Δ13C各不相同,其中根的Δ13C最小,然后依次为叶柄、茎秆、叶片,表明甘薯叶片光合同化物质在各器官中分配时发生碳同位素的分馏作用;在甘薯的各生育期,各器官Δ13C和瞬时WUE呈一致性的负相关关系。综上所述,碳同位素可以作为灵敏简单、快速准确的甘薯WUE的评价方法。展开更多
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 ...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.展开更多
文摘以我国大面积种植的典型旱地作物甘薯为研究对象,进行可控条件的不同水分处理的盆栽试验,研究了水分胁迫下甘薯各典型生育期各器官碳同位素判别值(Δ13C)、水分利用效率(WUE)及其之间的关系。试验设3个水分条件:分别为田间持水量的50%(W1),75%(W2),100%(W3)。结果表明,各生育期各器官生物量均随着水分增加而增加,在W3处理时达到最大,各生育期WUE则在W1处理时达到最大。尽管W3处理最终总生物量积累及产量最高,但高水分处理下将降低光合同化物向地下部的分配比例;同时,甘薯光合速率和Ru Bis CO活性之间呈正相关关系;甘薯不同生育期不同部位的Δ13C各不相同,其中根的Δ13C最小,然后依次为叶柄、茎秆、叶片,表明甘薯叶片光合同化物质在各器官中分配时发生碳同位素的分馏作用;在甘薯的各生育期,各器官Δ13C和瞬时WUE呈一致性的负相关关系。综上所述,碳同位素可以作为灵敏简单、快速准确的甘薯WUE的评价方法。
基金supported by the State Key Basic Research & Development Plan of China (2010CB951501)the CGIAR Generation Challenge Program (G7010.02.01)
文摘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.
