Breeding method for new disease-resistant cotton variety

Abstract

The present invention discloses a breeding method for a new disease-resistant cotton variety. The process includes: selecting a high-yield variety R resisting to fusarium wilt and verticillium wilt asa parent to be hybridized with a aphid-resistant variety Chuankang 77 to obtain an F1 generation; selfing the F1 generation to obtain an F2 generation, planting the F2 generation, and screening a disease-resistant plant; back-crossing the screened disease-resistant plant with the disease-resistant variety R to obtain a BC1F1 generation; selfing the BC1F1 generation to obtain BC2F1 to BC7F1 generations, and selecting the stably inherited BC7F1 generation; and hybridizing the BC7F1 generation and a saline-alkaline-resistant variety Shannong N02 to obtain a BU1C7F1 generation, and selfing BU1C7F1 generation until obtaining a new disease-resistant variety which is stably inherited. The variety simultaneously has various disease resistances and improves the yield and quality of cotton.

Description

technical field [0001] The invention relates to the technical field of cotton breeding, in particular to a breeding method for a new cotton disease-resistant variety. Background technique [0002] Cotton is the main economic crop in our country. my country's cotton yield per unit area and total output both rank first in the world. In recent years, my country's cotton area has exceeded 50 million mu. Xinjiang is rich in light, hot water and soil resources, and has a vast area suitable for cotton. In recent years, the cotton planting area in Xinjiang has exceeded 30 million mu, and its per unit yield and total output rank first among cotton-growing provinces (autonomous regions) in the country. Xinjiang is also the main high-quality cotton production area with the most development potential in my country. Among them, the early-maturing cotton-planting area in northern Xinjiang has about 8 million mu of cotton fields. It is one of the important cotton-growing areas in Xinjian...

AI Technical Summary

Problems solved by technology

However, most of the current cotton breeding techniques are limited to resistance to a specific disease, and it is impossible to integrate multiple disease-resistant genes into one variety at the same time. In addition, there are many types of cotton diseases, so only specific diseases are selected. Variety resistant to one cotton disease isn't enough for mass production