杂交稻高产群体干物质积累运转Ⅱ．碳水化合物的积累运转

Storage Carbohydrate Accumulation and Transportation Pattern of High Yielding Colony of Hybrid Rice

杂交稻高产群体贮藏碳水化合物（ＳＣ）的积累动态呈Ｌｏｇｉｓｔｉｃ生长曲线，积累半量期在开花期。其中的淀粉积累动态也呈Ｌｏｇｉｓｔｉｃ生长曲线，积累半量期在乳熟期；可溶性糖的积累动态呈单峰曲线，积累高峰在齐穗期，营养器官特别是叶鞘和茎秆，中期积累了大量ＳＣ，抽穗后源源运转到穗部，构成籽粒ＳＣ的３０％～３３％，其间齐穗后１０ｄ内运出的ＳＣ最多，等于当时籽粒ＳＣ净积累量的一半，对籽粒初期生长起了重大作用。在龙海县生产条件下，杂交早稻抽穗前茎鞘积累的ＳＣ和抽穗后叶片光合生产的ＳＣ都较多，因而产量显著高于杂交晚稻。

Storage carbohydrates(SC)accumulation and transportation pattem in high yielding colony of hybrid rice appeared as Logistic curve with the highest accumtilation speed at flowring stage.Among storage carbohydrates, the starch assumulation trends also appeared as Logistic curve with the highest ac-cumulation soeed at earlier stage of milk mature, However,the accumulation trends of monosaccharides and oligosaccharides appeared as single kurtosis curve with the highest accumulation amount at heading stage From initative panicle differentiation to heading,a lot of SC waS accumulation in vegetati ve or-gans especially in sheaths and stems After heading the SC ws transported to panicles,which composed 30 %～33 % of the SC accumulated in grains.Most of transportable SC was transportion to panicles in ten days after heading,which was about the half of seed SC accurnulated in the same period. Under the production condition of Longhai City,the SC accumulation of earlier crop hybrid rice was higher in sheaths and stems before heading and form leaf photosynthesis after heading Therefore,the grain yield of earlier crop rice showed greatly higher than that of later crop rice.