Quick cultivation method of sterile line of three-line hybrid rice

Abstract

The invention discloses a quick cultivation method of a sterile line of three-line hybrid rice. The quick cultivation method comprises the steps of hybridizing F1, which is generated by hybridizing a new rice species P and an improved maintainer line B and serves as a male parent, and a test cross offspring of the new rice species P and a sterile line A when the fertility of the test cross offspring of the new rice species P and the sterile line A is identified and the fertility of the test cross offspring sterile line is kept, and selecting single plants tending to target characters from F2, which is generated by hybridizing the new rice species P and the improved maintainer line B, and later generations to be continuously hybridized in pairs with selected sterile plants generated by re-hybridization of the test cross offspring of the new rice species P and the sterile line A so as to continuously feed genetic components of the single plants of the maintainer line into the sterile line, so that the sterile line can be quickly stabilized, and the yielding ability of the sterile line is improved. According to the method, a parent is subjected to restoring and maintaining relationship detection in the initial stage and transformation of sterile cytoplasms is executed at the same time; during selection of segregative generations, the transformation of the sterile cytoplasms is also executed, so that the breeding period is greatly shortened.

Description

technical field [0001] The invention relates to a rapid breeding method for three-line hybrid rice sterile lines, and belongs to the technical field of rice heterosis utilization. Background technique [0002] Chinese hybrid rice was discovered in 1964 when the wild sterile strain was discovered. In 1973, the three-line matching was realized. In 1976, it began to be widely promoted across the country. China's rice production has continued to reach new levels. According to statistics, in the 30 years from 1976 to 2005, a total of 5.6 billion mu of hybrid rice was planted across the country, increasing rice production by more than 520 billion kilograms. The increased rice production of hybrid rice in the country can feed 70 million more people every year. The three-line hybrid rice accounts for 70% to 80% [1] . However, in the late 1990s, the production of hybrid rice in my country was in a state of hesitation. The reason is mainly the aging of the male sterile line [2] ....

AI Technical Summary

Problems solved by technology

However, most of the sterile lines are still the conventional early indica in the 1970s and 1980s, which seriously restricts the development of three-line hybrid rice

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