Cross breeding process of Hailu cotton hybrid utilizing cytoplasmic male sterile

Abstract

The present invention is cross breeding process of cotton hybrid utilizing cytoplasmic male sterile. Pest and disease resisting gene is transferred into sterile line to breed sea island cotton type cytoplasmic male sterile line and upland cotton type cytoplasmic male sterile with resistance to cotton blight, bollworm and pink bollworm separately. Through further hybridization and backcross, the sea island cotton type restoring line and the upland cotton type restoring line with strong cytoplasmic male sterility restoring capacity are produced separately. Through test cross and screening with sea island cotton type sterile line and upland cotton type restoring line or upland cotton type sterile line and sea island cotton type restoring line, combined advantageous hybrid F1 with high yield, high quality and high resistance is bred. The present invention has relatively low cost of producing hybrid.

Description

technical field [0001] The invention relates to genetic breeding of crops, in particular to a method for breeding sea-land hybrid cotton using cytoplasmic male sterility. 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 have made great contributions to world food security. [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 ...

AI Technical Summary

Problems solved by technology

In the 1960s, male sterile types with abnormal cotton (G.anomalumWaWara & 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

As a result, the existing cotton varieties are generally of poor quality, and it is difficult to meet the requirements of the textile industry for cotton fiber quality