Breeding method of indica-cline type rice restorer line

Abstract

The invention discloses a breeding method of an indica-cline type rice restorer line, and is applied to the technical field of rice breeding. The method comprises the following steps of step S1, taking ordinary japonica rice as a female parent and a japonica-cline type restorer line as a male parent, and carrying out hybridization to obtain F1 seeds; step S2, planting F1 plants, carrying out composite hybridization with indica type rice to obtain F1 seeds; step S3, terminating the F1 seeds obtained in step S2, and performing inbreeding of multiple generations; and step S4, performing inbreeding of multiple generations on the seeds obtained in step S3 to obtain an indica-cline type single plant with a Cheng's index not lower than a preset value, and performing inbreeding of multiple generations to obtain the indica-cline type rice restorer line. According to the embodiment of the invention, conventional breeding is combined with molecular marker identification, the japonica rice consanguinity is infiltrated into the indica type rice, and the genetic difference is enlarged as much as possible to improve the heterosis.

Description

technical field [0001] The invention relates to the technical field of rice breeding, in particular to a method for breeding partial indica rice restorer lines. Background technique [0002] Rice is one of the most important food crops in China. Rice production plays an extremely important role in China's agricultural production, farmers' income increase and rural economic development. At present, the hybrid rice popularized in production mainly utilizes the heterosis between varieties and some subspecies. Studies have shown that the degree of heterosis in rice is related to the genetic distance between parents of hybrid rice. Theoretically, the greater the genetic distance, the stronger the heterosis. The genetic polymorphism among varieties within a subspecies is small, and the improvement of heterosis is limited. [0003] Therefore, in the prior art, there is no suitable breeding program for partial indica rice restorer lines, which is not conducive to further improvin...

AI Technical Summary

Problems solved by technology

Genetic polymorphism among varieties within a subspecies is small, and the improvement of heterosis is limited

[0003] Therefore, in the prior art, there is no suitable breeding program for partial indica rice restorer lines, which is not conducive to further improving the yield advantage of hybrid rice

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