Method for purifying and propagating three-line sterile line of water-saving and drought-resistant rice

Abstract

The invention relates to a method for purifying and propagating a three-line sterile line of water-saving and drought-resistant rice. The method comprises the following steps: (S1) carrying out single plant selection, paired backcross and test cross; (S2) carrying out A*B fertility identification nursery and heterosis identification; and (3) carrying out plant row (line) comparison and mixed propagation. Compared with the prior art, the method has the beneficial effects that B is selected by virtue of the heterosis of a maintainer line B*a restorer R, and the purifying efficiency is improved through selection by virtue of the backcross between the selected maintainer line B with obvious heterosis and a sterile line A, so that the cultivation procedure is simplified, the contradiction among crop rotation, seasons and water sources is relieved, the labor strength is reduced, and meanwhile, the contradiction of labor stress is relieved. The method has the advantages that rice fields, labor, water and cost are saved, the effect is enhanced, and the like.

Description

technical field [0001] The invention relates to the technical field of rice cultivation, in particular to a method for purifying and propagating a three-line sterile line of water-saving and drought-resistant rice. Background technique [0002] Rice is a kind of herbaceous Oryza genus, and it is also the most important and oldest kind of grain in Oryza genus. It is also called Asian cultivated rice, and it can be said to be rice in simple terms. It is an annual, gramineous plant, monocotyledonous, sexually warm and humid, about 1 meter high when mature, with slender leaves, about 50 to 100 cm long and 2 to 2.5 cm wide. The flowers of rice are very small. When blooming, the main flowering branches will be arched, and small flowers will bloom between 30 and 50 cm below the branches. Most of them are self-pollinating and set seeds, which are called rice spikes. Generally, the size of the rice ear is 5 to 12 mm long and 2 to 3 mm thick. [0003] In the existing rice cultivat...

AI Technical Summary

Problems solved by technology

[0003] In the existing rice planting, the purity of the sterile line is directly related to the yield and quality of hybrid rice seed production. All localities attach great importance to the purification of the sterile line. The traditional method of purification of the sterile line has a large workload and management procedures. It is cumbersome and the technical complex cycle is long. It only pays attention to the purity of the sterile line and ignores the performance of its heterosis (F1) generation. The result is that the purity of the sterile line is very good but it loses its heterosis and its application value.