Efficient japonica hybrid rice selective-breeding method capable of reducing seed production cost

Abstract

The invention relates to an efficient japonica hybrid rice selective-breeding method capable of reducing seed production cost. The method comprises the steps of irradiating a bone restorer line and amaintainer line of japonica hybrid rice with 350Gy of 60Co gamma-rays, carrying out parcel planting, carrying out genetic background selecting on a mutated line of a heading stage by using 48 SSR markers, constructing heading stage libraries of the bone restorer line and the maintainer line of the japonica hybrid rice with regard to pressurized screening of major breeding characters, and subjecting the maintainer line and a corresponding BT japonica rice sterile line to backcross transferring, so as to establish a bone sterile line library of the japonica hybrid rice. Through matched screeningof a test-cross sterile line / restorer line and a restorer line / sterile line close to a heading stage in the heading stage library, a high-quality high-yield disease-resistant japonica hybrid rice newcombination is selectively bred. According to the method, the efficiency of library establishing is high, the heading stage library of the bone restorer line can be established generally in 3 to 4 generations, the heading stage library of the bone sterile line can be established generally in 5 to 6 generations, and library establishing parents reserve major characteristics and excellent combiningability of original parents.

Description

technical field [0001] The invention relates to the technical field of crop breeding, in particular to a high-efficiency breeding method for hybrid japonica rice which reduces the cost of seed production. Background technique [0002] Rice is one of the most important food crops in the world, providing food for more than half of the world's population. At the same time, rice is also the largest grain crop in my country, and rice is the staple food for the survival of our people. The research and application of hybrid rice has greatly improved my country's rice production capacity and made outstanding contributions to ensuring my country's food security. With the improvement of people's living standards, the consumption demand for japonica rice is increasing day by day. The development of hybrid japonica rice has the double effect of improving the national grain output and the quality of life of the whole people. However, compared with hybrid indica rice, the planting ratio...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of low yield and high seed cost of hybrid japonica rice combined seed production, the present invention develops a high-efficiency breeding method for hybrid japonica rice that reduces the cost of seed production. The method utilizes 350Gy 60 The backbone parents of hybrid japonica rice were treated with Coγ-ray irradiation, combined with genetic background molecular marker selection and pressurized screening of main breeding traits, and the heading stage library of hybrid japonica rice sterile lines and restorer lines was quickly constructed, and the heading stage library constructed could be used to efficiently breed A new combination of hybrid japonica rice with similar or the same heading date of the parents to achieve the purpose of reducing the cost of seed production and increasing the yield of seed production

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