小麦孕穗期湿害对产量性状的影响

Analysis of the Effects of Waterlogging at Bootting Stage on Wheat Yield Characters

对 12个小麦品种 (系 )孕穗期遭受湿害后的产量性状进行了分析。结果表明 :孕穗期湿害使小麦穗粒数与穗粒重发生变化 ,有的品种如华麦 8号穗粒数及穗粒重均下降很小 ,有的如 92 14粒重下降很大但粒数下降较小 ,且不同小麦品种 (系 )对湿害的防御机制不尽相同。逐步回归分析表明 :湿害对主穗与分蘖穗的伤害机理并不相同 ,对主穗而言 ,湿害主要影响主穗粒重 ,对分蘖穗则是影响分蘖穗穗粒数。由于各产量性状的变化对产量的影响程度不同 。

Twelve varieties of wheat treated with waterlogging at booting stage and their yield characters were analysed. The results showed that waterlogging had great effects on wheat yield characters and wheat had different defence mechanisms. By regression analysis, we found that the damaging principle of stem ,s ears was different from that of branch's ears and changes of all yield characters had different effect on yield. Therefore, we can choose proper indexes when we evaluate the waterlogging effect on wheat.