Cross breeding process of color trilinear cotton hybrid

Abstract

The present invention is cross breeding process of color trilinear cotton hybrid. Pigment gene is led into restoring line to be improved to breed color cotton restoring line with strong restoring capacity to fertility of cytoplasmic male sterile line. Pest and disease resisting gene and pigment gene are transferred into sterile line to breed color cotton cytoplasmic male sterile line with resistance to cotton blight, bollworm and pink bollworm separately. Through test cross and screening with color cotton type sterile line and white cotton restoring line or white cotton sterile line and color cotton restoring line, combined advantageous hybrrid F1 with high yield, high quality and high resistance is bred. The present invention can express the heterosis sufficiently.

Description

technical field [0001] The invention relates to crop genetic breeding, in particular to a method for breeding colored three-line hybrid cotton. Background technique [0002] Heterosis is a common phenomenon in the biological world. Crops have obvious heterosis, and hybrids often increase yield by more than 15% than purebreds, which is an important means to improve crop yield, quality and resistance. The high yield and high quality brought about by the heterosis of crops such as corn, rice, rapeseed, sorghum, etc. have made great contributions to the world's food production. [0003] Three lines, namely male sterile line, maintainer line and restorer line, are systems for hybrid seed production (seed production) using plant cytoplasmic male sterility. The three lines should be fertile. The sterile line itself cannot produce active pollen grains. Its reproduction is realized through the supply of pollen by the maintainer line. The males of the mainta...

AI Technical Summary

Problems solved by technology

In the 1960s, male sterile types with abnormal cotton (G.anomalum WaWara & Peyr) and Asian cotton (G.arboreum L.) cytoplasm were bred, but due to unstable fertility, the "three-line" matching was not realized

In the 1970s, Meyer (1973) bred and released a male sterile line with Harknessii Cotton (G.harknessii Brand.) cytoplasm, but due to the defects of the restorer line such as weak recovery, it has not been able to realize the three-line hybrid cotton industrialization of seeds

At present, cotton hybrid seeds in the world are mainly obtained through the "artificial castration method", but it is labor-intensive, time-consuming and expensive, and its application in large areas is limited

[0005] Common problems in the application field of colored cotton are: low yield, short fiber, low clothing content, unstable pigment, etc., and it is difficult to cultivate