不同环境下水稻对受体植物化感作用的动态遗传研究

Study on Developmental Inheritance of Allelopathy in Rice (Oryza sativa L.) under Different Environment

采用包括基因型与环境互作的数量性状加性 显性发育遗传模型 ,研究了按双列杂交设计 (5× 6 ) 2配制的 1套包括亲本、F1 2个世代的水稻遗传材料对受体植物莴苣幼苗根长化感作用的动态遗传及与环境互作效应。遗传方差分析表明 ,控制水稻不同叶龄期化感作用的加性效应与显性效应呈交替表达趋势 ,叶龄在 7叶期受加性效应控制 ,在 3叶期和 6叶期由显性效应控制 ,在 5叶期和 8叶期加性和显性效应共同作用 ,以显性效应为主。这解释了在化感作用研究过程中发现的间断性表型表现的遗传原因。普通狭义遗传率随叶龄增大趋于下降。基因型与环境互作效应对水稻化感作用的影响较大 ,据此讨论了如何结合应用水稻化感作用的加性和显性遗传效应 。

rice varieties with different allelopathic potential were employed in a diallel cross (5×6)/2. Developmental inheritance of rice allelopathy on the root length of receiver plant lettuce ( Lactuca sativa L.) and its genotype×environment effects were analyzed by using additive dominance genetic models. The results showed that additive and dominant effect were found alternatively during 3-8 leaf stage of seedling. Additive effect was dominative at 7 leaf stage, and dominance effect appeared to play the most important role at 3 leaf stage and 6 leaf stage, but the two effects were equally important at 5 and 8 leaf stage. Heritability analysis indicated that H 2 N decreased as leaf stage increasing. Rice allelopathy was significantly affected by genotype×environment (GE) interaction. Accordingly,it was further discussed how to integratedly use the additive and dominant effects of rice allelopathy and rice heterosis in the breeding for weed resistance.