源库对直立穗型水稻品种结实率的影响

Effects of Treatments of Source and Sink on Seed-setting Rate of Varieties with Different Panicle Type

通过减源减库处理对直立穗型水稻辽粳5号、辽粳454和弯曲穗型品种辽盐16的结实率与库源的关系进行了比较研究。研究表明:不同品种间结实率差异较大,直立穗型品种辽粳5号低于弯曲穗型辽盐16,而直立穗型品种辽粳454结实率最高;不同部位籽粒结实率不同,上部结实率高于中下部,一次枝梗结实率较高,主要是中下部二次枝梗结实率低;减源后结实率降低,剪去剑叶辽盐16、辽粳5号结实率下降明显,剪去一半倒二叶或倒三叶则有利于结实率提高;去库后结实率提高,剪去一定部位的一次枝梗则整穗及其相应部位的二次枝梗结实率有较大程度的提高;穗轴各部一二次枝梗结实率受源库处理的影响不同,中下部所受的影响大于上部,二次枝梗所受的影响大于一次枝梗,这种趋势在直立穗型辽粳5上表现较明显。

The erect panicle type variety Liaojing 5, Liaojing 454 and curved panicle type variety Liaoyan 16 were chosen to study the seed-setting rate （SR） and its relationship with source and sink by reducing source or sink. The results indicated that significant differences of SR exist among the varieties, the SR of Liaojing 5 is lower than that of Liaoyan 16, but Liaojing 454＇s is higher than Liaoyan 16＇s; SR varies along the panicle axis, the SR of the upper part is higher than that of the lower part, the SR of primary branch （PB） is high and uniform along the panicle axis, and the SR of secondary branch （SB） is mostly low; source reduced, SR fell, the SR of Liaojing 5 and Liaoyan 16 fell distinctly after being dipped flag leaf, whereas SR rose by clipping half the 1st or 2ed below the flag leaf; sink reduced, SR rose, by clipping PB of certain part of the panicle the SR of SB of corresponding part and total panicle rose evidently; SR of different part of the panicle axis, PB and SB respond diversely to treatment of source and sink, the lower and middle part of the panicle axis were more sensitive than the upper part, and SB were more sensitive than PB, Liaojing 5 has the most visible trend.