Abstract: Investigations were carried out on the changes of leaf-sheath and stem reserve contents and effects of leaf-cutting, spikelet-thinning and hormones on the contents, translocation and residual ratio of these reserves during grain filling in rice varieties of Yanjing 235(sink-limiting type) and Shanyou 63 and Yayou 2(source-limiting type). The leaf-cutting and spikelet-thinning treatments delayed or accelerated the grain-filling processes of weak grains in all tested varieties, respectively, but had little influences on those of strong grains. The accumulation peaks of leaf-sheath and stem reserves of Yanjing 235 were about 5 days earlier than those of Shanyou 63 and Yayou 2, and the amount of reserves per unit sink capacity of Yanjing 235 was also higher. The translocation of reserves of Yanjing 235 to grains took place at heading stage, which was about 5 days earlier than the other two varieties, and ended at about 10 days after heading. The stimulation of spikelet-thinning on starch accumulation of leaf-sheath and stem of Yanjing 235 was higher than that of Shanyou 63 and Yayou 2, but its effects on translocation and residual ratio of stem-sheath reserves of Shanyou 63 and Yayou 2 were much significant than that of Yanjing 235. The effects of leaf-cutting were contrary to those of spikeletthinning. The contents,translocation and residual ratio of leaves,sheaths and stem of all rice tested varieties were markedly influenced by ABA treatments, depending on the treated sites of rice. 4-Pu 30 treatment significantly enhanced the accumulation, translocation and residual ratio of stem-sheath reserves irrespectives of the treated sites. The roles of stem-sheaths reserves in the early development of grains were also discussed.

Key words: Grain filling, Hormones, Reserve materials, Source-sink relation

摘要： 以库限制型水稻品种盐粳235和源限制型水稻品种汕优63和亚优2号进行研究，水稻籽粒的灌浆因品种源库关系而有很大差异，剪叶或疏花对强势粒的灌浆影响不大，但显著地延缓或加速弱势粒的灌浆进程，库限制型品种盐粳235抽穗前叶鞘和茎秆中临时性贮存物质积累高峰出现迟，单位库容占有贮存性物质比例低，两类型品种茎鞘中贮存物质均在籽粒发育早期输出，但盐粳135的输出持续时间长于汕优63和亚优2号的。疏花、剪叶和激素处理主要通过改变库源大小，增加或减少单位库容占有光合同化物比例及改变茎鞘贮存物质在整个籽粒灌浆物质中的比例来影响籽粒生长和发育。还就茎鞘贮存物质在籽粒早期发育中的作用进行了讨论。

关键词: 灌浆 贮存物质 水稻