Molecular breeding method of new varieties of cynoglossus semilaevis

Abstract

The invention discloses a molecular breeding method of new varieties of cynoglossus semilaevis and solves the problems that in current cynoglossus semilaevis breeding and cultivation, an intraspecific hybridization method has high randomness and low good variety breeding probability and a group breeding method causes inbreeding easily and thus causes reduction of economic traits and productivity. The method comprises breeding steps as follows: 1, selecting phenotypic characters; 2, detecting and analyzing genetic composition of male and female parents; 3, selecting parents in different breeding family trees, and performing grouping with the genetic distance between the parents of 0.7-1.0 as the threshold range; 4, breeding offspring until sexual maturity; 5, with cynoglossus semilaevis offspring as a new generation of parents, repeating operation in steps 1 to 4 until meeting the design requirement of the new varieties of cynoglossus semilaevis. According to the method, during breeding of the new varieties of cynoglossus semilaevis, the breeding family tree of each generation of parents is detected all the time, grouping is performed with the genetic distance between the parents of 0.7-1.0 as the threshold range, inbreeding can be avoided, the characters of the new varieties of cynoglossus semilaevis can be selected in the set direction, the economic characters and productivity can be significantly improved, and the probability of occurrence of superior new varieties can be increased.

Description

Technical field: [0001] The invention relates to a method for breeding a new fish variety, in particular to a method for molecular breeding of a new variety tongue sole. Background technique: [0002] Tongue sole semismooth is one of the leading fish species in marine culture in my country. It has the characteristics of large body, fast growth, delicious meat and high economic value. At present, the commonly used breeding methods are mainly intraspecific hybridization and group selection. Because the genetic information of the selected parents is not known before breeding, and the randomness of intraspecific hybridization is large, the probability of breeding good varieties is low, and group selection is easy to use. The inbreeding of the parents will lead to the degradation of germplasm, resulting in the degradation of traits such as hatching rate, emergence rate, growth rate, and poor stress resistance, which will reduce the economic traits and production performance of to...

AI Technical Summary

Problems solved by technology

At present, the commonly used breeding methods are mainly intraspecific hybridization and group selection. Because the genetic information of the selected parents is not known before breeding, and the randomness of intraspecific hybridization is large, the probability of breeding good varieties is low, and group selection is easy to use. The inbreeding of the parents will lead to the degradation of germplasm, resulting in the degradation of traits such as hatching rate, emergence rate, growth rate, and poor stress resistance, which will reduce the economic traits and production performance of semi-smooth tongue sole