Recurrent breeding method of cotton variety

Abstract

The invention discloses a recurrent breeding method of a cotton variety, and relates to the technical field of the breeding of cotton varieties. The recurrent breeding method of the cotton variety comprises the following steps of selecting multiple selfing-line materials, which are relatively broad in hereditary basis and high in general combining ability and belong to the same class group, as a base population to carry out recurrent selection; establishing a hybrid group on the basis of hybridizing the selfing-line materials with multiple cotton strains or coeno-species materials in a batch manner, wherein the cotton strains and the coeno-species materials belong to different types, have target traits, can normally and naturally reproduce and further do not contain sterile genes; obtaining an isolate recombination group and a stable selection group from the hybrid group; and forming one cycle by the four population groups of the base population, the hybrid group, the isolate recombination group and the stable selection group, and breeding a novel cotton strain which can naturally reproduce through one cycle or multiple cycles. Different types of breeding materials or resources meeting requirements can be obtained; the artificial castration, pollination and hybridization are not needed; the working procedure is simple; the labor intensity is low; and further, the work efficiency is high.

Description

technical field [0001] The invention relates to the technical field of cotton variety breeding, in particular to a cotton variety recurrent breeding method. Background technique [0002] Cotton is the seed fiber of the Malvaceae (Malvaceae) plant of the genus Gossypium, native to the subtropical zone. The plant is shrubby and can grow up to 6 meters high in tropical areas, generally 1 to 2 meters. The flowers are milky white, turn dark red shortly after flowering and then wither, leaving small green capsules called cotton bolls. There are cottonseeds in the cotton bolls, and the fluff on the cottonseeds grows from the skin of the cottonseeds and fills the inside of the cotton bolls. When the cotton bolls mature, they crack, exposing soft fibers. The fibers are white or white with yellow, about 2-4 cm (0.75-1.5 inches) long, containing about 87-90% cellulose, 5-8% water, and 4-6% other substances. The countries with the highest cotton production include China, the United S...

AI Technical Summary

Problems solved by technology

[0003] Modern cotton breed selection is not only to cultivate high-quality, high-yield, multi-resistant new crop varieties, but also to further enrich the genetic basis of crops so as to serve the long-term breeding goals in the future; conventional cotton breeding has Pedigree method and utilization of heterosis (crossbreeding of two excellent lines utilizes heterosis of the first generation), the pedigree method is to select two target parents to cross, and then through the pedigree selection, finally conduct a strain comparison test to breed new varieties. Its advantages: the hybrid pedigree clearly understands the blood relationship It can be checked, the breeding period is short, and it is easy to produce varieties; disadvantages: limited number of parents, simple genetic background, narrow genetic basis, limited types of offspring separation, seed production requires manual peeling and emasculation, pollination, high labor intensity, complicated procedures and cost high

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