杂交水稻收获指数与源库性状的遗传和相关分析

Genetic Correlation Analysis of Harvest Index and Source-Sink Characters in Hybrid Rice

用６个不育系与６个恢复系组成不完全双列杂交，对杂交水稻收获指数和源库性状进行了遗传和相关分析。结果表明，收获指数与源库性状均以基因加性效应起主导作用，其中收获指数、千粒重和穗粒数表现出较高的遗传力，而生物产量、籽粒源容和单株粒重的遗传力则较低。相关分析表明，收获指数与单株粒重呈极显著的正相关，与生物产量呈极显著的负相关，通径分析表明，收获指数、生物产量和籽粒源容对单株产量的通径系数分别为０．７６２１、０．５０３３和０．７１８８。

A 6×6 incomplete diallel cross was used to analyse genetic correlations of harvest index and source-sink traits in hybrid rice. The results showed that the additive gene effects mainly governed in harvest index and source-sink traits in hybrid rice.Harvest index,1000-grain weight, grains per panicle,had higher heritabilities and biomass,grain source-sink and grain weight per plant had lower heritabilities. The correlations between the harvest index and grain weight per plant were significantly positive and that between the harvest index and biomass were significantly negative.The direct path coefficients from the harvest index,the biomass and the grain source-sink to the grain weight per plant were 0.07621,0,5033 and 0.7188,respectively.