粳稻不同生态型杂种F_2产量性状表现及遗传传递的比较分析

The Comparative Analysis of Yield Characteristics and Genetic Transmit of F_2 from Different Ecotype Crosses in Japonica Rice

在分析盐粳68与粳亚种中的东北粳、华北粳、日本粳3种生态型杂种F2产量性状的表现及不同类型个体出现频率的基础上,初步认为与日本粳品种组配的F2群体出现穗数型个体频率较多,与华北粳品种组配的F2群体出现穗重型个体频率较多。同时对不同生态型产量性状的相关、通径、遗传参数分析表明,由于不同生态型产量性状对单株产量影响程度和遗传传递特点的不同,因此,在杂种早期世代在与东北粳组配的后代群体中应把总粒数和穗数作为选择重点,在与华北粳和日本粳组配的后代群体中应把穗数和总粒数作为产量形成的主要途径。

The performance of yield characteristics of F2s from different japonica ecotype crosses including northeast China ecotype, north China ecotype and Japan ecotype and the frequency of individuals were analyzed. The resulted showed that the F2s between Yanjing 68 and Japan types had better frequency in number of panicles per plant, while the F2s between the Yanjing 68 and north China types had better frequency in 1000-grain weight and grains per panicle. The results of correlation analysis, path analysis and genetic parameter analysis of yield characteristics of F2s from different ecotype crosses showed that due to the differences of influence degree of yield characters to the yield per plant and inheritance transmit characteristics, the selection of progenies from cross between Yanjing 68 and northeast China types at early generation should be emphasized on total grains and panicle number. The panicle number and total grains should be paid more attention at early selection of progenies from crosses between Yanjing 68 and north China type and Japan type.