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Temp-sensitive lethality male silkworm breeding method

A breeding method and lethal technology, applied in the field of breeding male silkworm varieties, to achieve the effect of good economic traits and strong operability

Inactive Publication Date: 2003-05-28
CHENGDU TIANCHUANG BIO TECH
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Problems solved by technology

[0014] Using sex-linked temperature-sensitive lethal genes to control the sex of silkworms is a relatively active topic in domestic research in recent years. Southwest Agricultural University has done a lot of work in this area and bred Xiafang×Autumn SCH male silkworm varieties, but the economic traits still need to be further developed. to improve

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  • Temp-sensitive lethality male silkworm breeding method
  • Temp-sensitive lethality male silkworm breeding method
  • Temp-sensitive lethality male silkworm breeding method

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Embodiment Construction

[0028] 1. Breeding of 871sch and 872sch purebreds

[0029] (1) Select the current silkworm varieties 871 and 872 for both spring and autumn as female parents, and their genotype is Z + W; the sex-linked red ant-marked temperature-sensitive lethal variety sch from the XT mutant system was used as the male parent, and its genotype was Z schh Z sch (sch is a recessive gene). see picture 1.

[0030] (2) Using 871 and 872 as reincarnation parents, using F 2 The method of combining "backcross introduction" and "generation directional selection" in the selection of reserved seeds focuses on the selection of moth plots and individuals with excellent performance and biased female traits.

[0031] As can be seen from Figure 1, F 1 The female silkworms of the generation are all red ants, and have the characteristics of temperature sensitivity and death; the male silkworms are all black ants, which are not sensitive to the temperature of greening. In order to restore complete hatchi...

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Abstract

A temp-sensitive lethal method for breeding the variety of male silkwork is characterized by high-silk-output variety "871" or "872" and the temp-sensitive lethal variety "sch" are used as raw materials, the combination of "backcross introduction" with "directional generation breeding" is performed to obtain excellent variety "871 sch" or "872 sch" of male silkworm, and the "871 sch" and "872 sch" are hybridized with "872" and "871" to obtain the hybridized variety "871x872 sch" of male silkworm. Its advantage is high output and quality of silk.

Description

technical field [0001] The invention relates to a method for cultivating male silkworm varieties; in particular, it relates to a method for controlling the sex of silkworms, even if the eggs of female silkworms are lethal, the eggs of male silkworms hatch normally. Background technique [0002] Silk is a great invention of our ancestors. The silk industry is a traditional industry with a history of more than 5,000 years in my country. With the rapid development of the world economy driven by high-tech in recent years and the changes in the demand for silk worldwide, the traditional silk industry is facing severe challenges. The shortcomings of my country's silk products such as irrational structure, low quality and low technical content have been highlighted. The reasons are mainly manifested in the following two aspects: one is that the technical level is backward, and there is little breakthrough in the selection and breeding of silkworm varieties; 2A, 3A); Second, the p...

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Application Information

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IPC IPC(8): A01K67/04
Inventor 白燕川朱勇赵力宾
Owner CHENGDU TIANCHUANG BIO TECH