Hybrid rice breeding method using parents with close duration from seeding to heading

Abstract

The invention discloses a hybrid rice breeding method using parents with close duration from seeding to heading and belongs to the breeding field of hybrid rice. The hybrid rice breeding method disclosed by the invention comprises: improving a rice sterile line and a restorer line by using different rice parents with close duration from seeding to heading and relatively remote genetic distance; carrying out sowing in different stages under different ecological environmental conditions to obtain a sterile line and a restorer line with close duration from seeding to heading and stable agronomic traits; then carrying out a test cross, planting a test cross F1 generation, and selecting a hybrid combination with excellent traits to obtain the hybrid rice with parents having close growing duration. The method ensures flower synchronization when the male parent and the female parent are sowed at a same stage, so that the reliability of production of hybrid seeds is improved; meanwhile, the mechanical operation in the field is further facilitated, the dependence on the labor force is reduced, the cost is lowered, and the efficiency of production of hybrid seeds is improved.

Description

technical field [0001] The invention relates to a hybrid rice breeding method, in particular to a hybrid rice breeding method whose parents have similar sowing start periods, and belongs to the field of hybrid rice breeding. Background technique [0002] Rice is the main food crop in China. At present, the annual rice planting area is about 430-440 million mu, of which the annual planting area of ​​hybrid rice is about 220 million mu, accounting for more than 50% of the total rice area, which contributes to the substantial increase in rice production and food security in China. made a great contribution. [0003] At present, most of the hybrid rice combinations promoted in China have a relatively large difference in the sowing start period (the number of days from sowing to the beginning of heading) between the male parent (restorer line) and the female parent (sterile line) (generally, the male parent period is long, and the reproductive period of the female parent is shor...

AI Technical Summary

Problems solved by technology

On the one hand, this leads to out-of-synchronization of the transplanting of the parents, and the field operation is basically dependent on manual labor, with a large amount of labor and high costs, and it is difficult to adapt to the current situation of reduced human resources engaged in agricultural labor; on the other hand, the sowing period of the parents It often fluctuates due to inter-annual climate differences. Even if the sowing time of the parents is adjusted according to historical experience, the phenomenon that the flowering time of the parents does not meet still occurs from time to time, and the seed production is difficult to guarantee.

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