杂交水稻干物质生产和光合特性与籽粒饱满度研究

对籼型和籼粳杂交稻干物质生产和光合特性及其与籽粒饱满度关系的研究表明，籼粳杂交水稻比籼型杂交稻具有更强的干物质４产优势，但器官间干物质分配率及其不同生长时期干物质积累率不平衡，导致茎叶干物质转换率和灌浆盛期群体净同化率较低，后期叶面积指数较大。影响籼粳杂交稻籽粒饱满度的主要因素是茎叶干物质转换率和孕穗后的群体净同化率以及群体生长率。

DRY MATTER PRODCTION AND PHOTOSYNTHETIC CHARACTERS AS RELATED TO KERNEL PLUMPNESS IN HYBRID RICE

The bcterosis of 37 crosses between indica and japonica rice was studied and correlation between the hybrids and their parents was estimated. Conspicuous heterobeltiosis was noticed in grains per plant, biomass weight per plant, growth duration, tillers per plant, plant height and grains per panicle. These parameters of the hybrids greatly exceeded those oF the greater parent and of Shan You 63, the check variety. Heterosis in 1,000-sccd-wcight was relatively small. Seed-setting rate showed a significant negative hcterosis. Corrclation and regression analyses indicated that plant height, tillers per plant, panicle length, grains per panicle, grain density, 1,000-seed-weight, biomass weight per plant, grain weight per plant and growth duration were significantly or hight significantly correlated with the mean values of the parents or with the values ofthe greater parent.