小麦抗旱品种的遗传多样性分析及株高优异等位变异挖掘

为了解北方冬麦区小麦抗旱品种的遗传多样性,筛选株高相关标记的等位变异,选用117个均匀分布于小麦各条染色体的SSR标记,对136份小麦抗旱品种进行分析。共检测到1484个等位变异,平均每个标记12.6个等位变异,变化范围为2～42个,供试材料的多态性遗传信息含量(PIC)变化范围为0.016～0.941,平均为0.640。聚类分析把同一地区或育种单位育成的品种、具有共同亲本的姊妹品种聚为一类,部分相近年代选育的品种也分别聚在一类,国外材料的基因导入对育成品种的遗传基础产生了影响。关联分析表明,在旱地条件下与株高显著相关的标记有19个(P0.01),其中6个极显著相关(P0.001);在水地条件下与株高显著相关的标记也有19个,其中7个极显著相关。水、旱两种条件下共检测出与株高极显著相关的标记9个,分别是Xbarc125(7D)、Xbarc168(2D)、Xgwm126(5A)、Xgwm130(2B)、Xgwm212(5D)、Xgwm285(3B)、Xgwm495(4B)、Xgwm95(2A)和Xwmc396(7B),其中Xgwm285的220bp、Xgwm495的181bp、Xgwm212的99bp和Xbarc125的167bp等位变异是与矮秆关联的优异等位基因。

Analysis of Genetic Diversity and Tapping Elite Alleles for Plant Height in Drought-Tolerant Wheat Varieties

To make advances in wheat breeding,it is important to study germplasm diversity of winter wheat accessions,and identify SSR markers associated with important agronomy traits,for example plant height.Plant height reduction has observably contributed to the lodging resistance and yield increase of wheat in the last decades.In this study,we selected 136 historical winter wheat accessions planted in northern China and 117 SSR markers evenly distributing on the chromosomes of wheat to reveal the genetic diversit...