家蚕茧荧光色的遗传研究

STUDIES ON THE INHERITANCE OF FLUORESCENT COLOUR OF COCOONS IN SILKWORM, Bombyx mori

以纯黄荧光茧色品种龙限A和纯紫荧光茧色品种龙限B为材料，将蚕茧荧光色量化．分析了蚕茧荧光色在不同世代的表现，发现F1代蚕茧的荧光分值介于两亲本之间，偏向荧光分值低的亲本，回交后代表现取决于回交亲本，估算出控制茧荧光色的基因在3对以上。家蚕茧荧光色主要受加性效应、显性效应、加性×加性效应及显性×显性效应控制，确定了茧荧光色的位点互作属于重叠型。发现家蚕茧荧光色的遗传是一种部分性连锁遗传。讨论了家蚕茧荧光色判性的可能机制。此外，还估算了家蚕茧荧光色的平均显性度和广义遗传力分别为0．5005、74．94。

Using strains spinning pure yellow and pure purple fluorescent cocoons Longxian A(p1)and Longxian B(p2), as raw materials, and converting cocoon fluorescent colour into its value, the results showed that the value of F1 was between its two parental stocks, and colse up that of p2. The value of the cocoon fluorescent colour of backcross generations was decided by recurrent parent. It was estimated that there were at least 3 pairs of genes that controlled the cocoon fluorescent colour. The cocoon fluorescent colour was mainly controlled by additive effects, dominant effects, additive × additive effects and dominant × dominant effects. Its interacting effects belonged to overlapping type. The cocoon fluorescent colour was inherited in a partial sex - linkage type. Its potential usage in distinguishing the female from the male was discussed. Additionally, broad heritability and average dominant ratio of the cocoon fluorescent colour were estimated to be 74. 94 and 0. 5005 respectively.