亚种间杂交稻干物质生产积累及转换与籽粒充实度的研究

Study on Dry Matter Production,Accumulation, Transportation and Grain Plumpness in Intersubspecific Hybrid Rice

对亚种间、品种间杂交稻和常规稻的干物质生产积累、运转和籽粒充实度进行了比较研究。结果表明，亚种间杂交稻穗大粒多，增产潜力大。在整个生育过程中，一直具有较强的干物质生产优势；在抽穗至成熟期，干物质运转率高，其干重颖花比值小；籽粒充实度差的主要原因是“库大源不足”。

The dry matter production,accumulation,transportation and grain plumpness of intersubspecific hybrids,intervarietal hybrids and ordinary varieties of rice were studied comparativelyThe results showed the yield-increasing potential of intersubspecific hybrid rice was greater than that of intervarietal hybrid rice because of its larger paniclesTherefore,the former is better than that of intervarietal hybrid rice because of its larger paniclesAnd the former had stronger vigour of dry matter producing than that of the later during the whole growing periodFrom heading to ripeness time,the intersubspecific hybrids performed high ratio of dry matter transfering and low ratio of dry matter weight to spikeletsThe main reason for the illness of grain plumpness was big sink and few source