Cyclic breeding method of cotton varieties

Abstract

The invention discloses a cyclic breeding method of cotton varieties. Cyclic selection is performed through a cotton bud yellow-light-sensitive male sterile line, cyclic operation is achieved through a hybrid colony, a separation and recombination colony and a stable selecting colony, and new cotton varieties which can be naturally bred are selected through one or more cyclic breeding; the hybrid colony is established with batch hybridization of the cotton bud yellow-light-sensitive male sterile line and multiple cotton varieties which are in different types, have the target trait, can be normally and naturally bred and do no contain sterile genes or hybrid materials as a basis. The cotton bud yellow-light-sensitive male sterile line serves as a basic material to perform cyclic selection, and early-stage separation and identification of offsprings are facilitated; the bud yellow-light-sensitive male sterile line serves as a bridge tool (a platform or a reactor) to perform batch hybridization, labor intensity can be lowered, a large amount of is saved, work efficiency is improved, many breeding materials or resources which are in different types and meet requirements can also be created, and the method is an innovative cotton variety breeding method.

Description

technical field [0001] The invention relates to the field of cotton breeding, in particular to a method for recurrent breeding of cotton varieties. Background technique [0002] Plants in nature are divided into three types according to the pollination methods: one is self-pollination → beneficial to gene maintenance, not conducive to gene recombination → hybridization is difficult; the second is cross-pollination → beneficial to gene recombination, not conducive to gene maintenance → difficult to stabilize; For the intermediate type of the above two types, frequent cross-pollination (cotton is a frequent cross-pollination crop) → mainly self-pollination, with a certain proportion of cross-pollination → easy hybridization, long stable time. [0003] Conventional cotton breeding includes pedigree method and utilization of heterosis (crossbreeding of two superior lines utilizes heterosis of the first generation). The pedigree method is to select two target parents for hybridiz...

AI Technical Summary

Problems solved by technology

[0003] Conventional cotton breeding includes pedigree method and utilization of heterosis (crossbreeding of two superior lines utilizes heterosis of the first generation). The pedigree method is to select two target parents for hybridization, and then through pedigree selection, finally conduct a strain comparison test to breed new varieties. Its advantages: hybridization The pedigree is clear and the 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, the genetic basis is narrow, the types of offspring are limited, and seed production requires manual detasseling and pollination, which is labor-intensive , complicated process and high cost

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