Genetic ecology of rice allelopathy on receiver plant

In this study, 5 parental rice lines with different allelopathic potential were employed in partial diallel cross (4×5) to get 10 groups of F 1 seeds. After testing the inhibitory effects of 5 parents and 10 F 1s under different environment at different leaf stage on the shoot length of receiver plant lettuce( Lactuca sativa L.),dynamic genetics of rice allelopathy and its genotype×environment effects were analyzed by using additive dominant developmental genetic models. The results showed that additive and dominant effect genes expressed alternatively during 3 leaf stage to 8 leaf stage in rice seedling. As additive effect genes were pronounced at 7 leaf stage,dominant effect genes appeared to play the most important role at 3 leaf stage and 6 leaf stage but the two effect genes were equally important at 5 leaf stage and 8 leaf stage. Heritabilities analysis indicated that the general heritability in the narrow sense(H N 2) was significant at 5 ,7 and 8 leaf stage,and decreased with increasing leaf stage. Rice allelopathy was significantly affected by genotype×environment(GE) interaction,suggesting that the environment of allelopathic rice development must be controlled for practical use.