甘蓝型低芥酸油菜单株产量基因效应的研究

用5×5半双列杂交研究甘蓝型低芥酸油菜单株产量的遗传,结果表明:供试的甘蓝型低芥酸油菜品系中,单株产量的遗传符合加性显性模型,显性性质为超显性,平均显性度为1.404。显性基因约为隐性基因的3倍多,并且多数增效基因表现显性,但也有显性的减效基因存在。单株产量的广义遗传力h_B~2=71.4％,狭义遗传力h_N~2=33.18％。供试亲本显性效应的强弱依次为81007>81006>81018>81004>81033,增效基因的多少依次为81018>81006>81007>81004>81033。一般配合力的大小依次为81018>81006>81004>81033>81007。

Genetic Analysis of seed Weight per Plant in Low Erucic Acid Rape (Brassica napus,L.)

Gene action studies for seed weight per plant were undertaken in a 5 x 5 diallel cross progenies of rape (Brassica napus, L.) with low erucic acid . Statistical analysis was carried out by using methodology of Jinks and Hayman (1963), as well as Ferreira's(1988). Absence of nonallellic interaction was observed in the inheretance of seed weight per plant. Additive and dominant gene effects were important with the preponderance of dominant gene effect. Average degree of dominance was in the overdominance range. Heritabitities in broad sense and in narrow sense are 71.41% and 31.18%, respectively. Among the population tested, the frequency of positive genes was 0.783 and dominant genes were more than 3 times as much as the recessive genes.The order of 81007 > 81006 > 81018 > 81004 > 81033 was observed according to the effect of dominance, in which 81033 showed more recessive genes than dominant and other parents had predominantly more dominant genes than recessive. In addition, the sequence of 81018>81006>81007>81004>81033 wai lound according to their effects of positive genes and also 81018 > 81006 > 81004 > 81033 > 81007 according to the effect of g.c.a.Summing up the results, it is recommended that heterosis breeding be used for seed weight per plant in rape (B. napus) , based on the development of superior inbred lines with high accumulation of positive genes. Reciprocal recurrent selection and haploid breeding approaches should be paid more attention to .