汕优63再生稻结实率与叶片结构的关系

杂交中稻汕优６３主茎和再生芽顶部三叶片的比较解剖表明：同位叶中，再生稻气孔器面积指数稍高，叶肉细胞层和胞壁皱折成瓣较多而增加了内面积和胞间隙．侧脉密度大，与形成籽粒数有关的导管数和横面积及筛管数和韧皮部横面积均比头季稻的多，这是再生稻提高光合输导效率、籽粒饱满、结实率高的内部结构基础．再生稻叶片较小，这与其发育过程叶原基细胞分裂数量减少有关．

The Relationships Between Seed Setting Rate and Leaf Structure of Ratoon Crop of Hybrid Rice Shanyou 63

Threc upper leaves of main stems and ratoon stems of medium hybrid rice Shangou 63 were anatomized comparatively. As compared with main-crop,ratooning rice posessed a litter larger area indices of stomatal apparatuses of leaves on the same positions, more mesophyll cell layers and folds of cell walls which made more petais and increased inner area and intercellular spaces, as well as higher density of lateral veins, the number of vessels, crosswise area of xylems,the number of sieve tubes and crosswise area of phloems, which were required for forming one plump kernel,were found to be more in ratooning rice than in main-crop. It was suggested to be the inner structural bases for getting plump kernels and higher seed setting rates by promoting the efficiency of photosynthesis and conduction.Leaves of ratooning rice were smaller in comparison with those of main-crop for the reductions of numbers of dividing cells of leaf primordia during development.