Abstract: The relation between axillary bud growth and matter accumulation of stem-sheath after full heading o f main crop were studied with hybrid rice combinations Shanyou 63, K-you 3 and K-you 5 in 1993-1995. During 15 days after full heading of main crop, most of photosynthates were transported to panicles, their axillary buds were stretched slowly under well light and N applied condition. At 20 days after full heading, or the grain filling at about 90% level, more photosynthates of the main crop were transported to their stems, the axillary buds were stretched quickly and effect of improving light condition as well as N application for accelerating axillary buds growth were appeared. Highly significant negative correlations were observed between the grain filling rate of main crop and stretching rate of their axillary buds, between amount of dry matter accumulation of panicles with harvest index of main crop and length of the axillary buds.

Key words: axillary bud, growth, hybrid rice, matter accumulation, stem-sheath

摘要： 1993～1995年，以汕优63、K优3号和K优5号为材料，研究了杂交中稻抽穗后再生芽生长与头季稻茎鞘物质积累的关系。头季稻齐穗后15 d内，叶片光合产物主要输送到穗部，以致再生芽生长缓慢，该期即使有较好的光照条件和氮素营养，对再生芽伸长也无作用；头季稻齐穗后20 d，即穗部籽粒充实度达90%左右，叶片较多光合产物逐渐向茎鞘输入，再生芽生长开始加快，此期光照和施氮促进再生芽伸长的作用才表现。头季稻籽粒灌浆速率与再生芽伸长速率呈极显著负相关，头季稻穗部物质积累量和收获指数分别与再生芽长呈极显著负相关。头季稻生长后期叶片光合产物的输送方向是影

关键词: 杂交中稻, 茎鞘, 物质积累, 再生芽