乳熟期淹水对两系杂交水稻源库特性的影响

选择两系杂交水稻培两优特青和培两优２８８进行乳熟期模拟淹水胁迫处理，研究了两系杂交秀乳熟期受淹后的源库特征，其结果如下，１）两系杂交稻乳熟期 绿叶数减少，剑叶叶绿素含量和叶绿素ａ／ｂ比值及光合速率均显著降低，剑叶光合速率与叶绿素含量呈显著正相关；２）乳熟期受淹期间 基本停止，甚至出现负增长，当解除胁迫后，随之出现一补偿灌浆高峰；（３）乳熟期闰的组成结构发生变化，比重大于１．３的谷粒所占比例显著减少

Effect of Complete Submergence at Milky Stage on Source and Sink of Two-line Hybrid Rice

Two line rice hybrids Peiliangyou Teqing and Peiliangyou 288 were submerged at milky stage and the influence of submergence on source and sink was studied. The results were as follows: a) The number of green leaves, photosynthesis rate, chlorophyll content and rate of Chlorophyll a/b in flag leaves decreased significantly after submergence, and the photosynthesis rate was significantly correlated to chlorophyll content. b) Grain filling almost ceased or even negatively increased during submergence, but it was followed immediately by a high grain filling peak after the stress. c) Submergence stress elongated the length, diminished the width and thickness of grains, and resulted in fewer grains with the specific gravity above 1.3 and more grains with the specific gravity below 1.1. d) The reason of yield loss was mainly because submergence at milky stage damaged the source, which resulted in decrease of seed setting percentage and grain fillingness.