Breeding method of high-quality three-line sterile line I2A

Abstract

The invention discloses a breeding method of a high-quality three-line sterile line I2A. Artificial hybridization is carried out by using D-aroma 1B as a female parent and gold 23B as a male parent, asingle plant with an excellent plant type, excellent comprehensive traits and resistance to rice blast is bred through three-generation systematic breeding, then the single plant and Gang 46A are subjected to multi-generation continuous backcrossing, in the backcrossing process, microscopic examination and selection are carried out generation by generation, a single plant which is completely abortive in fertility and has the plant type basically the same as that of the male parent is selected from a sterile line backcrossing group and backcrossed with the male parent, two-way selection is carried out, the breeding cycle is shortened, and the high-quality three-line sterile line which has stable fertility, excellent rice quality, a high reproduction and seed production yield, good resistance of a matched combination, high hybrid vigour and good comprehensive traits is finally bred and named as the high-quality three-line sterile line I2A and does not have aroma. The matched combinationof the high-quality three-line sterile line I2A is excellent in rice quality and high in yield, the organic combination of the high quality and the high yield is truly achieved, and the rice breedingproblem that hybrid rice is high in yield but not high in quality is solved.

Description

technical field [0001] The invention belongs to the technical field of rice heterosis utilization, and in particular relates to an I2A breeding method for high-quality three-line male sterile lines. Background technique [0002] Since the realization of three-line hybrid rice matching in 1973, it has been widely promoted across the country in 1976. China's rice production has continued to reach new levels, resulting in huge social and economic benefits. New CMS lines are constantly emerging, such as Zhenshan 97A, Dshan A, Gang 46A, Xieqingzao A, Ⅱ-32A, V20A, etc. These CMS lines have played a huge role in rice production. Because the rice quality of these sterile lines is poor, and has been used in production for many years, it is easy to be infected with the main diseases in production, and the yield of the assembled rice varieties is in a lingering situation. High-yield rice varieties often have poor rice quality, and good rice quality varieties have low yield. In order t...

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Problems solved by technology

[0005] In view of this, the present invention provides a high-quality three-line sterile line aiming at the problems of poor rice quality, aging, hesitant first-generation seed yield, and unsafe two-line sterile line in Sichuan seed production. The I2A breeding method of the line, the high-quality three-line CMS line has excellent resistance, excellent plant type, and environmental friendliness

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