A kind of recurrent breeding method of cotton sterile line

Abstract

The invention discloses a recurrent selection method for a cotton sterile line. The recurrent selection method is characterized in that recurrent selection is performed on the basis of a yellow sprout photoperiod-sensitive male sterile line; an underlying group, a hybrid group, a fractionation and reconstitution group and a stabilizing selection group of the yellow sprout photoperiod-sensitive male sterile line form a cycle, and the yellow sprout photoperiod-sensitive male sterile line is selected by one or more cycles; the hybrid group is established on the basis of hybridizing the yellow sprout photoperiod-sensitive male sterile line of cotton with multiple cotton lines or hybrid materials which have different types and objective traits, can normally and naturally breed and do not contain sterile genes. According to the recurrent selection method disclosed by the invention, the yellow sprout photoperiod-sensitive male sterile line is selected as a base material for recurrent selection, so that early separation and identification of progenies are facilitated; the yellow sprout photoperiod-sensitive male sterile lines are taken as bridge tools (platforms or reactors) for hybridizing in batches, so that the labor intensity can be reduced, great labor is saved, and the working efficiency is improved, and sterile line breeding materials or resources which are different in type and meet the requirements can be created; the recurrent selection method is a creative selection method for the sterile line.

Description

technical field [0001] The invention relates to the field of cotton sterile line breeding, in particular to a method for recurrent selection of cotton sterile lines. Background technique [0002] Plant male sterile lines currently used in production (referred to as sterile lines) are divided into two categories: three-line sterile lines and two-line sterile lines (mainly including two-line recessive male sterile lines and photosensitive recessive nuclear sterile lines). use system). The sterility maintenance of the three-line and recessive GMS lines must be artificially pollinated by the maintainer line to maintain the sterility of the sterile lines; the sterility maintenance of the photosensitive recessive GMS dual-purpose lines only needs to adjust the sowing date The sterility can be maintained by making the flowering period fall within the fertile period of its pollen, without artificial participation. However, all male sterile line hybrid seed production uses restorer...

AI Technical Summary

Problems solved by technology

[0003] Conventional cotton sterile line breeding consists of two parts: paternal pedigree method and cross-pollination to maintain female sterility. The paternal pedigree method is to select two target parents (one or two parents contain genes for maintaining female sterility) and hybridize , and then through selection and testing (including sterility maintenance test cross backcross and hybrid fertility recovery test cross, paired with two or three lines) pedigree selection, and finally purify the maintainer line and then purify the sterile line, using Hybrids are used for strain comparison tests to select sterile lines and new varieties. Its advantages: the hybrid pedigree is clear and blood relationship can be checked, the breeding period is short, and it is easy to produce varieties; disadvantages: the number of parents is limited, the genetic background is simple, and the genetic basis is narrow. The types of separation of offspring are limited, and manual pollination is required to maintain sterility and reproduction of sterile lines, which is labor-intensive, multi-process and costly

Images