Bt基因抗虫棉几个主要经济性状遗传参数估算及分析

Estimation of Genetic Parameter and Analysis of Several Main Economic Characteristics of Cotton Variety with Bt Gene

通过遗传参数的估计和相关分析,讨论了BT基因抗虫棉常规种品种间几个主要经济性状的差异和相关关系,计算了其遗传力和相关遗传力,结果表明:单株皮棉产量的提高主要通过衣分和单株结铃数的提高来实现;各性状遗传力值的顺序为单株皮棉产量>衣分>株高>单株结铃数>铃重>果枝数,株高与单株结铃数、衣分之间的相关遗传力较大;单铃重与纤维伸长率、单株结铃数与纤维整齐度呈显著正相关。通径分析表明:衣分、单株结铃数与皮棉产量的直接通径都较大。提高单株结铃数可实现高产与优质相结合的育种目标。

According to the estimation of genetic parameter and correlation analysis,the diverse and correlative relationship among several main economic characteristics of the different cotton varieties with Bt-gene was discussed and these economic characters heritability and correlation beritability were calculated. The result showed the lint yield could be improved with the improvement of lint percentage and number of balls per plant. The order of heritability was as follows： lint percentage 〉 plant height 〉 boll number 〉 boll weight. The correlation heritability between plant height and number of boll per plant,plant height and lint percentage was significant,respectively. The remarkable positive correlation between boll weight and fiber elongation was existed. The path analysis indicated that there was bigger straight path between lint percentage or number of boll per plant and the lint yield.The breeding goal of high yield and good quality can be achieved based on the improvement of number of bell per plant.