小白菜硝酸盐含量基因型差异的遗传行为研究

Genetic behavior of nitrate concentration genotype differences in pak-choi

对硝酸盐含量有明显差异的2个小白菜品种江苏矮脚黄(P1)、上海青(P2)及其杂交一代(F1)、杂交二代(F2)和回交一代(B1、B2)6个群体共计460株进行了硝酸盐含量的检测,并采用联合尺度检验法分析其硝酸盐含量性状的遗传规律。结果表明,小白菜硝酸盐含量属于数量性状,其遗传表现符合加性 显性遗传模型,小白菜高硝酸盐含量对低硝酸盐含量性状为部分显性,显性度为0.45。通过对遗传力的估计值计算结果表明,小白菜硝酸盐含量广义遗传力为56.1%,狭义遗传力为21.6%,显性作用和环境影响都较大。因此,选育低硝酸盐含量的品种,应注重在高世代(如F5或F6)进行选择,不宜采用个体选择。

Study on additive-dominant genetic model and gene effects were conducted on the date of 6 Paki-choi (\%Brassica campestris\% L. ssp. \%Chinensis\%(L.) Makino)population including high nitrate concentration cultivar 'Jiangsu Aijiaohuang'(P1), low nitrate concentration cultivar 'Shanghaiqing'(P2), F1 population(P1×P2), F2 population(F1×F1) and B1 population(F1×P1), B2 population(F1×P2)。The result of joint scaling test showed that the population means for the nitrate concentration was 3028mg/kg, The additive effects of the genes on the nitrate concentration in 'Jiangsu Aijiaohuang' was 2207mg/kg, more than the corresponding allele in 'Shanghaiqing'. The gene on the nitrate concentration in 'Jiangsu Aijiaohuang' was dominant to the corresponding allele in 'Shanghaiqing' with the degree of dominance of 0.45. The results of test of fitness indicated that additive-dominant genetic model was adequate for nitrate concentration in pak-choi. The result also showed that the heritability of nitrate concentration in pak-choi was 21.6%-56.1%.