Studies on the Developmental Genetics of Tiller Number in Three-line Indica Hybrid Rice
LIANG Kang-jing, LIN Wen-xiong, WANG Xue-ren, CHEN Zhi-xiong, GUO Yu-chun, LIANG Yi-yuan, CHEN Fang-yu and LI Ya-juan ( College of Crop Science, Fujian Agriculture and Forestry University, Fuzhou 350002, P. R . China )
Following NCI design, the developmental genetic behavior of tiller number (TN) in three-line indica hybrid rice was studied using additive-dominance developmental genetic models and the corresponding statistical methods. The results showed that dominance effects were predominant for TN. The expression of those additive effects were affected by environment and genotype interaction, but the expression of dominance effects were not affected. Heterosis was the strongest in the middle developmental periods of TN. Additive effects and dominance effects were selectively expressed throughout in the entire tillering developmental stage. Analysis of genetic correlation between TN at different stages and the productive panicles indicated that a close correlation appeared earlier in the populations with higher heterosis than in those with less heterosis. Utilization of heterosis at the middle tillering stage might enhance the final biomass but reduce the percentage of productive panicles.
【CateGory Index】： S511.21