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The Breeding Method of Double Backcrossing to Breed Multiple Hybrids of Bombyx mori

A hybrid and backcross technology, applied in animal husbandry and other directions, can solve problems such as difficult to integrate economic traits, and achieve the effects of ensuring purity and hybridization rate, improving scientific and technological content, and reducing chain burden.

Inactive Publication Date: 2015-12-02
GUIZHOU SERICULTURE RES INST GUIZHOU PEPPER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the similarity of the variety materials, it is difficult to reach a better level of comprehensive economic traits even if the varieties bred by hybridization methods. For this reason, breeders are looking for various methods to solve the shortcomings in the breeding work.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: the breeding method of double backcross selection multivariate hybrid of silkworm:

[0032] The cross combination before breeding is: (M · N) × (S · T) This is the (middle · middle x day · day) four-way cross combination pattern of silkworm.

[0033] 1. The breeding process is

[0034] (1) (M×A) After backcrossing A for more than five generations×C

[0035] (2) (N×A) After backcrossing A for more than five generations×C

[0036] (3) (S×B) After backcrossing B for more than five generations×D

[0037] (4) (T×B) After backcrossing B for more than five generations×D

[0038] Among them, there are two hybridizations, continuous backcrossing, establishment of multiple systems, selection, directional breeding, combining ability test, and combination of new combinations (new varieties).

[0039] 2. Final breeding:

[0040] ﹛(M×A)×C·(N×A)×C)﹜×﹛(S×B)×D·(T×B)×D)﹜, the bred combination is still (中·中× Day · Japan) Quaternary hybrid combination mode. The bred va...

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Abstract

The invention provides a breeding method of multivariate hybrids of double backcross breeding silkworm. The method comprises the following steps of: selecting a double-limit quaternary hybrid combination as a carrier variety; firstly, carrying out continuous back-crossing after a basic material with strong resistance is hybridized with the carrier variety, hybridizing the basic material with excellent silk quality with the same carrier variety which firstly guides in a resistance gene in the hybridizing manner, then carrying out continuous back-crossing to obtain pure breed with strong resistance and excellent silk quality, and finally breeding the multivariate hybrid practical variety by a combining ability test.

Description

technical field [0001] The invention relates to a silkworm breeding method, in particular to a multiple cross breeding method for silkworm selection by double backcrossing. Background technique [0002] Hybrid breeding is the most widely used and most mature breeding method in breeding methods. It is widely used in silkworm breeding, and it is also a technology that constantly makes breakthroughs and new methods emerge in an endless stream. [0003] The present invention selects breeding materials, which are varieties with double-limited markings, fast development and wide adaptability, and simultaneously select 4 purebreds of the same hybrid combination for production as carrier varieties, that is, to select for use in production but some traits need to be improved The quaternary hybrid combination variety: M·N×S·T, and the combination mode is Zhong·Zhong×日·日. The imported basic material for double backcrossing is also to select pairs of Chinese and Japanese varieties with...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01K67/04
Inventor 罗朝斌黄桂辉孙运朋
Owner GUIZHOU SERICULTURE RES INST GUIZHOU PEPPER RES INST