Breeding method of upland cotton hybrid

Abstract

The invention relates to a method for breeding an upland cotton intervarietal hybrid, and belongs to the technical field of plant breeding. Multi-parents are crossbred through mixed pollination, and filial generation excellent plants are crossbred through mixed pollination to breed female parent line 29-8. The male parent 203-16 line is selected and bred through multi-parent hybrid, excellent plant mixed pollination hybrid, and combination of techniques such as identification of verticillium wilt disease and verticillium wilt hybrid disease nursery, space-flight induction and so on. The female parent line 29-8 and the male parent 203-16 line are prepared into a hybrid Ning 2058. The hybrid Ning 2058 belongs to middle-early ripen variety, the growth season is about 120 days, the plant height is 98.60 cm, the node position number of fruit branch is 6.38, the fruit branch number of single plant is 11.96, the boll number of the single plant is 22.66, the boll number per mu is 65,900, the single boll weight is 6.95g, the seed index is 10.88g, the gin turnout is 41.17 percent, the pre-frost lint percentage is 89.23 percent, and the hybrid is suitable to be planted in various cotton areas in Tianjin City.

Description

1. Technical field [0001] The invention relates to a breeding method for upland cotton hybrids, which belongs to the technical field of plant breeding and is specially used for breeding upland cotton hybrids with early maturity, high yield, disease resistance and pollen high temperature resistance. 2. Background technology [0002] Verticillium wilt is an important disease that affects cotton production in my country. In recent years, the incidence area has been relatively large, seriously affecting cotton production in this area. Verticillium wilt resistance of cotton varieties lacks the source of resistance, and the pathogenicity of pathogenic bacteria differentiates quickly, and the resistance of the source of resistance tends to degrade after use. Resistance is negatively correlated with yield, and the agronomic traits of resistant sources are often poor. It is difficult to breed cotton varieties with excellent traits such as Verticillium wilt resistance, Fusarium wilt ...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems of poor disease resistance and negative correlation between disease resistance and high yield in the production of cotton varieties in the prior art, the present invention provides a method of crossing multi-parent hybrids, intercrossing pollen of excellent single plants of hybrid offspring, and increasing the recombination of excellent genes Breeding method for cultivating early-maturing, disease-resistant and high-yielding cotton varieties by combining frequency, breaking bad correlation, disease nursery screening, space-flight mutagenesis (satellite carrying), pollen germination test at 33°C high temperature, and agronomic traits identification