寒地水稻品种成熟期叶片衰老过程差异

为探明不同寒地水稻品种成熟期叶片衰老过程的差异 ,试验分析了 11个寒地水稻品种成熟期叶面积和叶氮含量的动态变化过程。结果表明 ,水稻成熟期叶面积变化过程可分为 和 两个阶段 ,阶段 叶面积稳定不变 ,阶段 叶面积直线下降 ;成熟期叶氮含量直线下降。不同品种抽穗期叶面积、叶面积阶段 的持续时间、叶面积阶段 的叶面积降低速率、抽穗期叶氮含量、抽穗后叶氮含量降低速率等性关不同。寒地水稻品种抽穗期叶氮含量高、抽穗后下降快 ,功能露片持续时间就长。寒地超高产水稻品种应具有抽穗期叶氮含量高、叶厚、叶茎夹角小、叶面积适中 ,抽穗后功能叶片持续时间长、叶片姿态变化小等特征。

Varietal differences in the change processes of the leaf senescence of japonica rice in cold area

The change processes of the leaf area (LA) and leaf nitrogen content (LNC) during the ripening period were analysed with 11 varieties of japonica rice.The results indicated that the change process of the LA included 2 phases.The LA remained stable in phase 1 and deceased linearly in phase 2.There were differences in the LA during the heading stage,the duration of LA Phase 1,the decrease rate in LA Phase 2 in varietal japonica rice.The LNC of japonica rice decreased during the ripening period.