Nude hybrid rice and breeding method thereof

Abstract

The invention discloses nude hybrid rice and a breeding method thereof, and belongs to the technical field of the utilization of rice heterosis. The nude hybrid rice can be obtained through mutagenesis according to the characteristics that the nude character of rice is controlled by a pair of recessive genes. A maintainer line (B line), a two-line sterile line (S line) and a restorer line (R line) of hybrid rice which has excellent performance on the production is subjected to direct irradiation mutagenesis to obtain nude gene mutants corresponding to the maintainer line, the two-line sterile line and the restorer line of the hybrid rice. A nude maintainer line 'nude B' is hybridized and backcrossed with a corresponding A line to obtain a nude sterile line 'nude A' with the nude character. The 'nude A' can be assembled with 'nude R' to obtain nude three-line hybrid rice; and 'nude S' can be assembled with the 'nude R' to obtain nude two-line hybrid rice. The nude hybrid rice is high in photosynthetic efficiency, and is easy to manually harvest, mechanically harvest and thresh; and the characteristics of increasing the storage capacity of the rice, reducing working dust and the like ensure that the nude hybrid rice has relatively strong market competitiveness.

Description

technical field [0001] The invention specifically relates to a naked hybrid rice and a breeding method thereof, and belongs to the technical field of rice heterosis utilization. Background technique [0002] Leaf hairs are a unique structure of plant leaf epidermis. The morphology and mechanical properties of plant leaf hairs directly or indirectly affect many aspects of plant physiology and ecology. People call the whole rice plants such as blades, stems, leaf sheaths and grains in cultivated rice all smooth and hairless types called "light body rice", also known as "light leaf rice" and "light husk rice". Naked rice can reduce skin itching and skin damage during manual harvesting and threshing, and naked rice is also of great value in increasing rice storage capacity and reducing dust from mechanized harvesting and factory processing. At present, naked rice varieties have initially been paid attention to and promoted in my country. Naked rice is a valuable germplasm reso...

AI Technical Summary

Problems solved by technology

However, the method of introducing naked genes into maintainer lines, sterile lines, and restorer lines through traditional hybrid backcrossing methods not only requires a lot of work, but also has a long breeding period. It usually takes 5-7 years to breed naked hybrid rice combinations that can be used in production. Time-consuming, labor-intensive, low-efficiency