Breeding method for pest-resistant nigger-brown fibre new species of cotton

Abstract

The invention discloses a cotton bollworm resistant dark brown color cotton (dark brown fiber) breeding method. The transgene insect-resistant cotton strain SGK 9708 is used as basis material, and then the transgene insect-resistant cotton strain SGK 9708 improvement strain with insect-resistance homogeneity (100%), increased blight and verticillium wilt resistance, increased ginned cotton yield by about 15.0% than the raw material is obtained through breeding and identifying insect resistance. Then the transgene insect-resistant cotton strain SGK 9708 improvement strain is used as female parent to hybridize with the dark brown, high-yield, yellow anther new strain brown 263. After individual system selection for several years, a series of cotton bollworm resistant, dark brown color cotton new strains are bred, comprising B2K8, R12-1 or like. The bred dark brown color cotton not only has antlered larvae such as cotton bollworm resistance of dark brown color cotton, but also reduces pesticide consumption, protects environment, at the same time the fiber quality, ginned cotton yield are greatly increased.

Description

technical field [0001] The invention relates to a breeding method for new cotton varieties, in particular to a breeding method for new varieties of dark brown colored cotton which are resistant to cotton bollworms by transfecting Bt+CpTI bivalent genes. Background technique [0002] The cotton fibers of colored cotton have natural colors, and there is no need for chemical treatments such as dyeing, bleaching, and scouring during the textile process. production cost. Among the more than 7,000 cotton germplasm resources in the China Cotton Medium-term Bank, there are more than 170 colored cotton germplasms collected (more than 140 domestic germplasms and more than 30 foreign germplasms), of which 85 are upland cotton (green cotton 27 parts, 58 parts of brown cotton), 58 parts of 6 strains of upland cotton semi-wild species (brown), 27 parts of brown Asian cotton, 6 parts of brown sea-island cotton, and 2 parts of brown African cotton. However, these colored cotton germplasms...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of breeding method of Bt+CpTI bivalent gene anti-cotton bollworm, dark brown colored cotton for above-mentioned deficiency, this method can breed a series of anti-cotton bollworm, high-quality, high yield, green colored cotton new crops Germplasm, in order to overcome the current problems of dark brown colored cotton not resistant to cotton bollworm, poor fiber quality, low yield, etc.

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