穗重差异型两系法杂交水稻灌浆期若干源库指标动态变化的比较

Difference of the Dynamic of Source and Sink and their Correlations during Grain Filling for the Different Panicle-weight Types in Two-Line Hybrid Rice

从单茎水平上比较了重、中、轻3种不同穗重型两系法杂交水稻灌浆期若干源库及其相互关系指标的动态差异。结果表明,相对于中、轻型两系法杂交稻,重型具有如下特点:单穗粒多、实粒数多、千粒重重、单茎库容量大;抽穗后叶绿素含量前期高、中期衰减慢、后期较迅速;籽粒灌浆速度快,持续期长;抽穗后前期比叶重大,后期持续缓慢衰减;粒叶比高、物粒比和颖花茎鞘重较低。

Differences of the dynamic of source and sink and their correlations of the heavy, middle and light panicle-weight types in two-line hybrid rice from the level of per stem during grain filling were studied. The results showed that the traits for the heavy panicle type in two-line hybrid rice comparing to those of middle and light panicle types were as followed： More grains and filled grains per panicle, heavier 1 O00-grains, grea- ter per panicle sink, higher chlorophyll content in the early stage and decreasing more slowly in the middle stage while faster in the late stage, more rapidly and longer duration of the grain filling, higher leaf dry matter weight/leaf area in the early stage and decreasing more slowly in the late stage , higher Leaf area/spikelets, lower matter weight/spikelets, lower stem and sheath weight/spikelets.