不同环境下水稻化感作用的动态杂种优势分析

Analysis on Dynamic Heterosis of Rice Allelopathy Under Different Environmental Conditions

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 {P(P +1) / 2 }配制成 1套包括亲本、F1两个世代的水稻遗传材料在不同环境条件下化感作用的动态杂种优势。结果表明 ,杂种F1和F2 在大部分叶龄时期具有抑制受体植物茎长和根长的杂种优势。F2 的化感作用潜力与F1相比有所下降 ,在不同环境条件下其群体平均优势均为F1的 1/ 2。在温度较低、光照较弱的田间环境条件下 ,水稻化感作用杂种优势较大。暗示着环境胁迫会增强化感作用的性状表现 ,解释了植物在不利环境下产生化感物质数量有所增加的遗传原因。

In this study, 5 parental rice varieties with different allelopathic potentials were employed in diallel cross {P(P+1)/2} to get a set of genetic materials including parental lines and two generations of F 1s. The dynamic heterosis of allelopathy in rice under different environmental conditions was analyzed by using additive-dominant developmental genetic model. The results indicated that heterosis in both F 1 and F 2 showed inhibitory effect on shoot and root length of receiver plant (Lactuca sativa L.). Heterosis over mid-parent based on population mean(HMP) in F 2 was lower than that in under differental environmental conditions, showing 1/2 HMP in F 1. The heterosis of rice allelopathy was enhanced under the field environmental condition with lower temperature and weaker sunlight than that under favorable environment, implying that the allelopthic potential could be increased by stress environment. This findings interpreted the genetic reason that plant could produce more allelochemicals under unfavorable environment.