A method for recurrent selective breeding of water-saving and drought-resistant rice using dominant genic sterile materials

Abstract

The invention relates to a method for carrying out recurrent selection breeding on water-saving and drought-resisting rice by utilizing a dominant nuclear male sterile material. The method comprises the steps of hybridizing by using the dominant nuclear male sterile material as a female parent and the water-saving and drought-resisting rice as a male parent, and backcrossing by five times, thus obtaining a water-saving and drought-resisting rice dominant nuclear male sterile plant; then hybridizing by using the water-saving and drought-resisting rice dominant nuclear male sterile plant as the female parent and 15 to 30 kinds of good parents as the male parent, and equivalently mixing offsprings to form a first round of recurrent selection populations; planting the first round of recurrent selection populations in a dry land, carrying out artificial supplementary pollination during a heading stage, selecting seeds on good sterile plants during a maturing stage, and equivalently mixing the seeds to form a second round of recurrent selection populations; repeating the recurrent selection process; selecting good fertile individual plants from the recurrent selection populations at any time, entering a pedigree method, and breeding a new variety of the water-saving and drought-resisting rice. The method for carrying out the recurrent selection breeding on the water-saving and drought-resisting rice by utilizing the dominant nuclear male sterile material, disclosed by the invention, has the advantages that the dominant nuclear male sterile material is used as a carrier, materials of the water-saving and drought-resisting rice and materials of good rice are in wide hybridization, and the genetic basis of existing water-saving and drought-resisting rice is greatly enriched.

Description

technical field [0001] The invention relates to the field of plant breeding, in particular to a method for recurrent selective breeding of water-saving and drought-resistant rice by using dominant nuclear sterile materials. Background technique [0002] Rice is a typical self-pollinating crop. For a long time, the improvement of rice varieties has mainly relied on hybrid breeding methods. However, limited by traditional artificial hybridization techniques and breeding cycles, only a few excellent parents were used for hybridization in the rice breeding process, resulting in genetic The basis is narrowing day by day, and the newly bred varieties are similar with minor differences. With the continuous change of today's rice breeding goals, there are new requirements for the yield, rice quality, disease and pest resistance, drought resistance and light and simplified cultivation of rice varieties in production. Traditional breeding methods have been difficult to meet the needs ...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to propose a method to overcome the problem that water-saving and drought-resistant rice materials have good drought resistance but limited yield potential, while rice materials have high yield but poor drought resistance, and provide a method for reincarnation using dominant sterility materials. Selective Breeding Methods