Method for breeding natural color pod new-strain using quick purifying silkworm and wild silkworm distant hybridization generation charater

Abstract

The present invention provides a process for rapidly breeding novel strains of colorful silkworm cocoons, particularly a process for breeding novel strains of natural colorful silkworm cocoons by utilizing selection of gene expression of multi-phenotype special character tags and quickening homozygosity of characters of offspring from wide cross of cultivated silkworms and wild silkworms. Based on the expressive characteristics of a plurality of appreciable morph character stigmata genes (such as ovum color, mottled grain of larvas, skin redness of larvas, volume color of scalewings, color of cocoon fibers, etc.) of offspring from wide cross of cultivated silkworms and wild silkworms at different development phases for the same generation, the wide cross color incunabulum strain syngen is constructed with the goal of precocity, easy cultivation, strong disease resistance, high yield, high feeding efficiency, thin titer and colourful cocoon fibers; the genetic amelioration of multi-phenotype tag character assistant selection and economic character orthoselection is carried out continuously for many years to stabilize the homozygosity of each system character from wide cross of silkworms; simultaneously, desired practical characters of silkworms can be sufficiently recombined and converged to obtain novel strains of natural colorful silkworm cocoons.

Description

technical field [0001] The invention belongs to a method for rapid breeding of new strains of colored silkworm cocoons, in particular to a method for speeding up the homozygous breeding of new strains of natural colored silkworm cocoons by utilizing the expression of multi-phenotype special trait marker genes to speed up the homozygous breeding of the traits of offspring of distant hybrids between silkworms and wild silkworms strain method. Background technique [0002] China is the birthplace of silk and the largest silk producer in the world. Silk is a precious variety of natural fibers. The breeding goals of silkworm varieties focus on the improvement and breakthrough of economic traits such as high quality, high yield, and strong resistance. The progress of silkworm varieties is also mainly reflected in the improvement of body constitution, silk quantity and silk quality. At present, my country's current silkworm varieties are already at the leading international level...

AI Technical Summary

Problems solved by technology

Distant hybridization is very difficult, the main reasons are: the biological compatibility of different species is very poor, and it is extremely difficult to hybridize with each other; hybrids have weak viability, and hybrid offspring are sterile or low in fertility; Long time, not easy to stabilize

[0006] Silkworms are insects with economic traits. In general, distant hybridization segregation is more crazy, homozygous algebra takes longer, and breed selection is more difficult; new practical varieties have not been reported yet, and excellent trait genes are fast and stable homozygous silkworm distant hybrids Key to Breeding and Utilization

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