Abstract: Field experiments were conducted to investigate dry matter accumulation and translocation and grain filling after flowering with three indica rice Baguixiang (superior quality rice), Guihuazhan(good quality rice) and Zhenguiai(inferior quality rice, CK) as materials in the spring and summer seasons in 2007. Results showed that high quality rice (including superior and good quality rice varieties Baguixiang and Guihuazhan) had greater dry weight of leaves and culm and sheath per culm, as well as higher dry matter translocation ratio and rate of leaf after heading. However, little difference was found in dry matter translocation in culm after heading between high quality rice and the control. According to the simulation of dry matter accumulation of grain in the three rice varieties with the Richards′ equation, high quality rice showed earlier initial filling, longer active filling period and lower maximum filling rate. About 1/5 to 1/3 of dry matter in grains were from leaf and culm dry matter redistribution after heading and the postanthesis dry matter contribution to grain in high quality rice was 1.5 to 2.0 times of the control. Correlation analyses indicated that grain growth was correlated with dry matter redistribution of leaf. It can be concluded that great leaf dry matter accumulation and redistribution were one of the most important reasons of high quality in rice.

Key words: highquality indica rice, dry matter accumulation, dry matter translocation, grain growth, dynamic characteristics

摘要： 以品质优良、较好、较差的桂华占、八桂香、珍桂矮（CK）3个籼稻品种为材料，研究了优质稻花后干物质积累、运转与籽粒生长的动态特征及相互关系。结果表明，优质籼稻品种花后单株叶片和茎鞘干物质量大，花后叶片干物质的转运率和转运速率较对照高，但茎鞘的花后运转与对照的差异较小。3个水稻品种籽粒干质量的动态均可用Richards方程进行模拟，但优质品种的灌浆启动快、活跃灌浆期长、最大灌浆速率小。花后茎叶干物质的再运转占籽粒干质量的1/5~1/3，其中优质品种花后叶的再运转对籽粒生长的贡献是对照的1.5~2.0倍。相关分析表明，花后叶的干物质运转与籽粒生长的关系密切，因此，单株叶片干质量大、花后运转率高可能是优质水稻品质形成的重要生理原因之一。

关键词: 优质籼稻, 干物质积累, 干物质运转, 籽粒生长, 动态特征