小麦叶片RuBP羧化酶活性对湿害逆境的响应能力及亲本效应分析

用＾１４Ｃ同位素示踪法研究了６个小麦品种叶片的ＲｕＢＰ羧化酶活性对孕穗期湿害逆境的响应能力及其产量性状表现；用完全双列杂交法测定了９个小麦亲本耐湿性的配合力。结果表明：在孕穗期湿害逆境下，不同品种间的ＲｕＢＰ羧化酶活性下降程度存在明显差异，这种差异与主茎绿色叶片数和产量性状的变化相一致，配合力分析结果表明，亲本之间一般配合力差异达极显著水平，组合间特殊配合力效应存在显著差异，说明小麦品种的耐湿性受

Response of Leaf RuBPcase Activity to Waterlogging and Parental Effect Analysis in Wheat

Effects of waterlogging on leaf RuBPcase activity and yield components were studied in wheat with 14C traced technique. Genotypes differed greatly in decrease in leaf RuBPcase activity after 25 days of waterlogging at the booting stage. Norin 46 and Shuilizhan were insensitive to waterlogging while Ningmai 3 and Zhening Xuan were sensitive in the term of decrease in leaf RuBPcase activity. This difference was in agreement with changes in the number of green leaves on main stem and yield components.Combining ability of waterlogging tolerance was studied by using diallele cross method 4 with 9 wheat genotypes. Results showed that general combining ability(G. C. A)among parents and their special combining abilitiy(S. C. A)differed significantly. Therefore, waterlogging tolerance was governed by both additive and non-additive effects, with additive effect as the principal factor. Parents were evaluated for their values in breeding based on their effect of G. C. A. and variance of S. C. A.. Compton, Xifeng, Shuilizhan and Norin 46 were elite parents in breeding for waterlogging tolerance.