Abstract: A large-panicle cultivar Chaofengzao and a medium-panicle cultivar Xiangzaoxian 13 were used, by means of leaf-cutting and spikelet-thinning treatments in order to make different sink/source ratio, to study the characters of source-sink interaction, dry matter production and its partitioning, the change trends of activities of source, sink and transport organs. The results indicated that the treatments with higher sink/source ratio and sink capacity had a higher net assimilating rate (NAR), less nonstructural carbohydrate content in stem and leaf, higher transport rate of 14C-assimilate into grains, and higher activities of sink and transport organs.

Key words: assimilate partitioning, physiological index, biochemical index, source-sink relationship, yield components

摘要： 大穗型水稻品种超丰早和中穗型品种湘早籼13，齐穗后进行剪叶疏粒处理创造不同的库源比例，重点考察了源库互作关系，干物质生产和分配，源、库、流活性的动态变化和产量性状等。结果表明，库对源具有反馈促进作用，库／源比高和库容量大的处理净同化率（NAR）较高，茎鞘和叶中非结构碳水化合物滞留量少，14C同化物向籽粒输送比例增加，输导组织和库器官活性趋于增强。

关键词: 源库关系, 同化物分配, 生理生化指标, 产量性状