不同类型的水稻组合(品种)干物质生产和光合特性与籽粒充实度的比较

Comparative Studies on Dry Matter Production, Photosynthetic Characters and Grain Plumpness Among Various Types of Rice

对亚种间杂交稻、品种间杂交稻和常规稻不同类型的水稻组合（品种）的干物质生产和光合特性及其籽粒充实度进行了比较研究。结果表明，在水稻生长发育前期，亚种间杂交稻比品种间杂交稻和常规稻具有更强的干物质生产优势，但生长发育后期干物质生产能力较差，群体净同化率和群体生长率较低，干物质分配不协调，库容量大，早衰，导致亚种间杂交稻的籽粒充实度差。并根据研究结果对如何提高籽粒充实度进行了探讨。

The dry matter production, photosynthetic characters and grain plumpness of intersubspecific hybrids, intervarietal hybrids and ordinary varieties of rice were studied comparatively. The results showed that the dry matter production of intersubspecific hybrids was greater than that of intervarietal hybrids and ordinary varieties in the early gtowth stage. But in the later growth period, the weak dry matter production ability, low net assimilation rate and the growth rate of the population,imbalance of dry matter partitioning among organs,big“sink”capacity and premature decay were considered factors to contribute to the ilness of grain plumpness. And how to improve the grain plumpness was also discussed according to the results.