中文摘要：

在旗帜叶角度，解剖，光合作用，叶绿素内容，人口光合作用，和轻传播的动态变化在三小麦栽培变种被调查：在哪个标记叶角度的 Xiaoyan 81 ( Xy 81 )变化从对 draped 直立，在哪个标记叶角度的 Xiaoyan 41 ( Xy 41 )变化从对半 draped (中间的类型)直立，并且旗帜叶从 flowering 在仍然保持直立到充满谷物的舞台的 Xiaoyan 6 ( Xy 6 )。在叶厚度，叶区域，叶肉形态学，叠的 granal，光合作用，或叶绿素内容的明显的差别都没在三栽培变种之中被发现。它感兴趣发现 Xy 81 的旗帜叶角度变化从对 draped 直立在谷物期间—充满的舞台，但是在这个时期期间在叶绿素内容或光合的能力没有明显的变化，显示那在旗帜叶角度变化不源于老朽。而且，在 Xy 81 人口光合作用和光铺平传播的学习表演比在 Xy 41 和 Xy 6 高。总起来说，这些结果证明在 Xy 81 旗帜叶角度的动态变化提高人口光合作用并且可以因此改进小麦产量。

英文摘要：

Dynamic changes in flag leaf angle, anatomy, photosynthesis, chlorophyll content, population photosynthesis, and light transmission are investigated in three wheat cultivars： Xiaoyan 81 （Xy 81） in which flag leaf angle changes from erect to draped, Xiaoyan 41 （Xy 41） in which flag leaf angle changes from erect to half draped （middle type）, and Xiaoyan 6 （Xy 6） in which the flag leaf remains erect from the flowering to the grain-filling stage. No obvious differences in leaf thickness, leaf area, mesophyll morphology, granal stacking, photosynthesis, or chlorophyll content are found among the three cultivars. It is of interest to find that the flag leaf angle of Xy 81 changes from erect to draped during the grain - filling stage, but there are no obvious changes in chlorophyll content or photosynthetic capacity during this period, indicating that changes in flag leaf angle do not result from senescence. Moreover, the study shows that levels of population photosynthesis and light transmission in Xy 81 are higher than in Xy 41 and Xy 6. Taken together, these results demonstrate that dynamic changes in Xy 81 flag leaf angle enhance population photosynthesis and thus may improve wheat yield.