摘要:
杂交稻高产群体干物质的积累动态呈Logistic生长曲线,积累半量期在减数分裂期,以中期积累最多,后期次之,前期较少。水稻各生育时期有其相应的干物质分配中心,前期为叶片和叶鞘,中期为叶片。叶鞘和茎秆,后期为穗。籽粒干物质的73%～75%来自抽穗后的光合作用,27%～25%由营养器官贮藏的干物质转运而来。在营养器官转运的干物质总量中,贮藏碳水化合物占86%,NPK占6%。杂交早稻中,后期的光温优势,促进了中。后期的于物质生产,产量显着高于杂交晚稻。
Abstract:
Dry matter accumulation pattern of high yielding hybrid rice colony appeared as Logistic curve with the highest accumulation speed at meiosis stage.The accumulation amount was the maximurn in middle period(panicle initiative differentiation to heading),the second in later period(after heading)and the little in earlier period(before oanicle initiative differentiation).There were relevantlv different dry matter distribution centers in various growth stageS of rice.The distribution center in earlier period was leaves and sheaths,in middle period was leaves,sheaths and stems,and in later period was panicles, About 73%～75% of panicle filling matter was from photosynthesis after heading,and 27%～25% from the transportable storage matter in vegetatibve organs.Among the total transporting matter of vegetative organs,about 80% was storage carbohydrates and 6% was N P K The advantageous light and temperature condition in middle and later periods of earller crop promoted the dry matter production of hybrid rice,which made the grain yield of earlier crop rice much higher than that of later crop rice.
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