Method for Breeding Widely Compatible Indica CMS Lines with Dian-type Cytoplasm

Abstract

The present invention relates to a method for breeding a wide-compatibility indica-type sterile line with Dian-type cytoplasm. In the method, the maintainer material of japonica rice with wide-compatibility gene, dwarf stem, disease resistance and high-quality is selected as the female parent, and has been selected by indica-japonica hybridization. The middle indica, dwarf, and early-maturing maintainer materials are used as the male parent for crossing, and the F1 generation of the hybrid is backcrossed with the above male parent material; the ideal plant type of indica is selected in the middle generation after backcrossing, and the Dian type is used. In the Dian-type cytoplasmic transfer plots, select the plots with complete sterility or high sterility rate, and focus on the corresponding indica-type maintainer line materials that meet the breeding objectives. For the stable CMS materials, carry out test crossing at the recovery surface, select and match strong dominant hybrid rice combinations, and carry out plot propagation and seed production. The method has fast transfer speed and stability, and the obtained sterile line has wide recovery range, high seed reproduction and seed production yield, and good stress resistance.

Description

technical field [0001] The invention relates to the field of rice breeding, in particular to a method for breeding wide-compatibility indica-type sterile lines by using Dian-type cytoplasm. Background technique [0002] Three-line hybrid rice is a great achievement in rice breeding and promotion. The so-called three-line is: (1) male sterile line: the pistil develops normally, but the development of the stamen degenerates or aborts, and cannot self-pollinate and bear fruit; (2) maintain Line: the pistil of the male sterile line develops normally, and its pollen is given to the pistil of the male sterile line, not only can form seeds, but also can still obtain male sterile plants after sowing; (3) restorer line: its pollen is given to the pistil of the male sterile line, After the resulting seeds are sown, the grown plants regain their fertility. [0003] Rice is the same as other crops, the strength of heterosis is subject to the genetic molecular level of parental genes. ...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a method for breeding a wide-compatibility indica-type sterile line with Dian-type cytoplasm in view of the prior art. Physiological and reproductive barriers such as insufficiency, insufficient grains, etc., so as to breed indica-type sterile lines with high yield, good resistance, and high quality, laying the foundation for the cultivation of super-high-yield hybrid rice combinations

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