Silkworm breeding method capable of realizing whole male silkworms after two successive generation hybridization through controlling sex ratio

Abstract

The invention relates to the technical field of genetic breeding of silkworms, in particular to a silkworm breeding method capable of realizing whole male silkworms after two successive generation hybridization through controlling a sex ratio. According to the method, a silkworm sex-linkage balanced lethal system and a Z chromosom linkage condition lethal system are used, and through hybridized combination of two strains, F1-genearion female silkworms are all dead, F1-genearion male silkworms are all survived, after the F1-genearion male silkworms hybridize with other conventional female silkworms, F2-genearion female silkworms are all dead, and F2-genearion male silkworms are all survived, so that whole male silkworms after two successive generation hybridization is realized. By adopting the method, the silkworm breeding cost is reduced and economic benefits for silkworm breeding are increased.

Description

technical field [0001] The invention relates to the technical field of silkworm genetics and breeding, in particular to a method for controlling the sex ratio of all males of silkworm successive two-generation hybrid offspring, which reduces the cost of silkworm breeding and improves the economic benefits of silkworm breeding. Background technique [0002] Bombyx mori belongs to female dimorphic insects, the sex chromosome of female silkworm is ZW, and the sex chromosome of male silkworm is ZZ. If there is a recessive lethal mutation gene on its Z chromosome, then in the female individual, the recessive lethal mutation gene will play a role and cause the female individual to die ; and in male individuals, since there are two Z chromosomes, if only one Z chromosome has a recessive lethal mutation and the other Z chromosome is a normal gene, then such a male individual is still alive. [0003] As far as a silkworm species is concerned, the cocoon layer rate and fresh silk prod...

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Problems solved by technology

[0005] However, these excellent silkworm sex linkage balance lethal practical silkworm varieties, in the process of breeding the original species, half of the males and females died and the other half survived, and the female silkworms cannot be used for production, and generally do not need to be reared, although egg color can be used to distinguish males and females However, manually distinguishing silkworm eggs is time-consuming and laborious, which increases the cost of silkworm breeding

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