Proteomic

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Five parental rice varieties with differentt allelopathic potentials were used for diallel cross based on [P P+1 /2] design to get genetic materials including parental lines and two generations of F1s. The dynamics of heterosis for allelopathy in rice at different leaf stages was analyzed using additive-dominant developmental genetic model. The results showed that heterosis in both F1 and F2 was inhibitory to shoot and root length of lettuce (Lactuca sativa L). The heterotic effects in allelopathy varied with the leaf stage of rice accession. Simultaneous backcrossing and selfing breeding method was used to develop the hybrid rice with allelopathic activity and the isogenic hybrid rice with non-allelopathic effect on weeds. It was also indicated that heterotic effect on allelopathy in rice was positively-significant, showing higher heterosis over midparent. This hybrid rice had the additive suppressive effect on the target weed barnyardgrass, exhibiting a large deviation from the resource competition curve. Thus we improved the genetic performance of the trait in this hybrid combination for commercial use.

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