穗部光照条件的改变对水稻产量及物质生产与分配的影响

对两个穗型差异明显的粳稻品种做穗部遮光处理。试验结果显示：抽穗后任何时期穗庶光处理对产量均有影响，表明良好的光照对穗发挥其功能是必要的，水稻对穗庶光反应的敏感期是在抽穗期至穗弯曲阶段。穗庶光既影响水稻植株同化产物的总积累量，又影响光合产物向穗部籽粒的分配，对光合产物分配的影响更为显。穗遮光对直立穗型品种光合产物分配的作用大于对弯穗型品种。

Effects of Covering Panicle on Yield, Biomass Accumulation and Its Partition in Rice

Covering panicle treatment was made in two rice (Oryza sativa ssp. japonica) varieties with different panicle types. The experimental results showed that the yield decreased with the treatments at any stage after heading, suggesting that good illumination was essential for function performance of rice panicles. The sensitive stage in response to covering panicle was from heading to panicle curving. Covering panicle affected both the accumulation of photosynthate and its partition to grains. The effect of covering panicle on partition of photosynthate was higher in variety with erect panicles than that with curved panicles.