Analysis on Dynamic Heterosis for Allelopathy in Rice Under Different Environment Conditions

摘要

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_1 s. The dynamic heterosis for 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 effects 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 differental environmental conditions, showing 1/2 HMP in F_1. The heterosis in rice allelopathy was much higher under the field environmental conditions with lower temperature and weaker sunlight than that under favorable environment, implying that the allel-opthic potential could be increased by stress environment. This finding interpreted the genetic reason that plant could produce more allelochemicals under unfavorable environment.