Method for breeding cotton with greensickness-resistance

Abstract

The invention relates to a verticillium wilt resistant cotton breeding method, which comprises the following steps: (1) a disease nursery is established and the pathogenic seeds are annually updated; (2) the seeds are soaked, infected with pathogen and sowed; (3) the verticillium wilt resistant cotton material is bred. The method can also identify and screen out a cotton variety with compatible resistance by introducing a Bt gene. The variety which is accurately bred by the method and the breeding process provided by the invention has the advantages of strong and stable verticillium wilt resistance, high yield, wide applicability and remarkable economic benefits.

Description

technical field [0001] The invention belongs to the field of crop breeding, in particular to a cotton breeding method for Verticillium wilt resistance. Background technique [0002] Verticillium wilt is one of the most important diseases of cotton, known as the "cancer" of cotton, and it was introduced to China in 1935. Since Fusarium wilt was brought under control in the late 1980s, Verticillium wilt has become the number one disease of cotton. Since the 1990s, the disease has spread to all major cotton producing areas in my country, and the rate of diseased plants in seriously diseased cotton fields is often as high as 80%, resulting in serious yield loss. In 1993, 1995 and 1996, Verticillium wilt occurred in a large area continuously. Among them, in 1993, the national cotton Verticillium wilt disaster area reached 40 million mu (2.6667 million hm2), and the loss of lint was 2 million tons (100 million kg), especially in the northern cotton area. In many cotton fields, t...

AI Technical Summary

Problems solved by technology

After the 1970s, the occurrence of Fusarium wilt of cotton gradually increased, and breeding for resistance to Fusarium wilt began. However, the breeding technology basically used natural disease-susceptible test fields for disease resistance identification. The identification results of hybrid offspring materials are inaccurate, and the selection or elimination of materials is relatively blind

After the 1990s, the occurrence of Verticillium wilt became more and more serious, and there was an urgent need to breed varieties resistant to Verticillium wilt. However, methods similar to those for resistance to Fusarium wilt were still used in the identification and selection of disease resistance. The breeding efficiency was low, and the selection of offspring materials was inaccurate. Poor disease resistance and lower yields of resistant varieties

In the late 1990s, Bt genetically modified insect-resistant cotton was commercially planted in a large area in my country. Although it has a significant control effect on target pests such as cotton bollworm, the transgenic insect-resistant cotton currently on the market is basically not resistant to Verticillium wilt