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Method for improving traits in sex-linkaged balanced lethal silkworm strain by hybridization

A technology of balanced lethality and interlocking, applied in animal husbandry and other fields, can solve the problems of complicated operation, large breeding scale, and difficult to correct errors, etc., and achieve the effect of simple operation

Inactive Publication Date: 2008-10-08
ZHEJIANG ACADEMY OF AGRICULTURE SCIENCES
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the defects of complicated operation, large breeding scale, and difficult correction of errors in the above-mentioned technology; or it can only improve the individual traits of the balanced lethal line, but has little effect on the improvement of the overall traits, and proposes A method for cross-improving the sex-linked balanced lethal line of silkworm, which is relatively simple to operate, can rapidly improve its overall character level, and at the same time maintain its sex control ability, and then can be used to combine it with conventional silkworm varieties. Hybrid Combination of Male Silkworm with Excellent Economic Traits

Method used

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  • Method for improving traits in sex-linkaged balanced lethal silkworm strain by hybridization
  • Method for improving traits in sex-linkaged balanced lethal silkworm strain by hybridization
  • Method for improving traits in sex-linkaged balanced lethal silkworm strain by hybridization

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Effect test

Embodiment 1

[0025] Embodiment 1: (Bombyx mori sex linkage equilibrium lethal line sex control gene structure and principle and the breeding process of Ping 60)

[0026] Since the sex-linked balanced lethal line of silkworm is a special silkworm species, for the convenience of explanation and understanding, a brief introduction to the sex control gene structure and principle of the sex-linked balanced lethal line of silkworm is given here. figure 1 It is the structure and schematic diagram of the lethal sex control gene of silkworm sex continuity balance. from figure 1 It can be seen that each of the two sex chromatids Z of the male of this system has a recessive homozygous embryonic lethal gene with a mutation, namely l1 and l2. The exchange rate of the two genes is 0.8%; there is a recessive homozygous third albumen gene w3 / w3 on the 10th autosome, so the male genotype structure is Z l1 Z l2 w3 / w3. On the W sex chromosome of the female, there are simultaneous translocations of the se...

Embodiment 2

[0033] Embodiment 2: (breeding and character test of flat 60)

[0034] Table 1 Breeding results of the newly bred silkworm sex-linked lethal line Ping 60 (autumn 2007)

[0035]

[0036] The silkworm balanced lethal line Ping 30 was used as the parent of the balanced lethal line, and the current variety 416 was used as the parent of the conventional silkworm variety. From the spring of 2001, after 4 years of research, a new silkworm sex-linked balanced lethal line was successfully crossed and bred; and then After 3 years and 6 generations of purification, a fixed balanced lethal new variety named Ping 60 was bred. The traits of Ping 60 have been significantly improved compared with its parent Ping 30. The breeding test results in the autumn of 2007 are shown in Table 1.

Embodiment 3

[0037] Embodiment 3: (the hybridization of flat 60 utilizes its male silkworm hybridization combined character test)

[0038] Modern silkworms have all adopted hybrids in production, so to measure the quality of an original species (parent), we must look at the economic traits of the first generation of hybrids. The male silkworm rate of the F1 generation of Ping 60 crossed with the silkworm variety Huajing was over 99%. It can be seen from Table 2 that the performance of the male silkworm hybrid combination is better than that of Huajing × Ping 30 on the one hand, indicating that the new sex-linked lethal line of silkworm Ping 60 bred with Ping 30 as the starting parent has better traits. On the other hand, the results of Huajing × Ping 60 have surpassed the current silkworm variety Jingsong × Haoyue in terms of cocoon silk quality and vitality, and have reached the level of the male population of current silkworm varieties, which is of practical value.

[0039] Table 2 Coco...

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Abstract

The invention discloses a method for hybridizing and improving silkworm sex linkage balanced lethal system characters and belongs to the technical field of silkworm breeding. The method is used for culturing an intermediate material with translocation gene on a sex chromosome W by the continuous backcross of the male of ordinary breed and the parent strain female silkworm of the balanced lethal system; the female of the intermediate material and the male silkworm of the balanced lethal system are hybridized and continuously selfed, and the balance 60 of a new balanced lethal system breed is selected and cultured by the phenotype difference of lethal genes. The method has simple operation and small breeding scale, which keeps the gene for controlling sex of a new silkworm sex linkage balanced lethal system and also improves the economic character comprehensively. The male silkworm production of the male silkworm hybridization combination of Huajing is multiplied by the balance 60 is more than 99 percent; compared with the current main bred female-male silkworm breed of Jingsong is multiplied by Haoyue, the cocoon filament quality and the vitality of the invention are much better, thus achieving the male population level in current breed, which can be applied in silkworm breeding organizations.

Description

technical field [0001] The invention relates to the technical field of silkworm breeding, in particular to a method for improving the economic traits of male silkworm hybrids formed by mating the silkworm with conventional silkworm varieties by improving the traits of the silkworm sex-linkage equilibrium lethal line. Background technique [0002] Compared with female silkworms, male silkworms have the obvious advantages of eating less mulberry, lower cost of raising silkworms, high silk yield and excellent silk quality. The special breeding of male silkworms can increase the economic benefit by more than 20% compared with the current mixed breeding of males and females. Therefore, China, Japan, Russia and other countries have studied silkworm sex control technology from different angles, trying to realize exclusively male silkworm breeding in production. Satisfactory male silkworm varieties have not been obtained for half a century, so the technology of exclusively raising ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01K67/04
Inventor 何克荣祝新荣孟智启陈诗柳新菊
Owner ZHEJIANG ACADEMY OF AGRICULTURE SCIENCES
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