冬小麦品种间旗叶衰老特性的比较

本文研究冬小麦开花后旗叶净光合速率的变化规律，分四种类型：急降型、快降型、稳降型、缓降型。进行系统聚类分析，18个品种可分为三类－－正常衰老、轻度衰老、严重衰老。又根据旗叶与籽粒灌浆成熟的关系，比较两个典型品种鲁麦14、215953，得出结论：①根据小麦的不同品种特性，采取相应的栽培措施。②提高小麦产量关键不是一味延长生育期，而是要采取诱导延长高水平的净光合速率。

Comparison of Flag Laves' Senescence Among Winter Wheat Varieties

This paper deals with varing rules of flag leaves photosynthetic rate after winter wheat's f1owering, which can be divided into four patterns:sharp decreasing, rapid decreasing, stable decreasing and slow decreasing.after cluster analysis, 18 varieties can be divided into three kinds:normal senescence,low grade senescence and serious senescence. According to the relationship between flag leaf and grain's filling and maturing, we compared two typical varieties,Lumai l4 and 215953, and drew the conclusion: Appropriate cultivation measures should be adopted in accrordance with different traits between Wheat varieties. The key factor of increasing wheat yield is not extend the growing stage,and is to take appropriate means to induce extending the photosynthetic rate of high level.