Breeding method for rapidly polymerizing cold resistance and rice blast resistance of rice

Abstract

The invention discloses a breeding method for rapidly aggregating cold resistance and rice blast resistance of rice, relating to a rice breeding method. The invention aims to solve the problem of long breeding time in the existing cold-resistant and blast-resistant rice breeding methods. Methods: 1. Northeast japonica rice varieties are used as the female parent, and cold-resistant and rice blast-resistant japonica rice varieties are used as the male parent. F1 is obtained by crossing, and F2 is planted; 2. The field phenotype of F2 is initially selected, tested, and used as the F3 generation Three, the F3 generation is planted, tested and planted, as the F4 generation; Four, the F4 generation is planted, and the excellent strains are screened as the F5 generation; Five, the F5 generations are alternately planted, and the screened strains are the F6 generation; The cold-damaged rice area and rice blast disease-infested area are planted, and excellent strains are selected to obtain cold-resistant and rice blast-resistant rice. The method can lock target traits earlier, continuously track dominant traits and obtain rapid aggregation, advance and save the time for aggregation of ecological advantageous traits, and achieve early determination of breeding goals and early aggregation. For rice variety breeding.

Description

technical field [0001] The invention relates to a rice breeding method. Background technique [0002] There are 4.7 million mu of paddy fields in the mid-mountainous area of ​​the eastern mountainous area of ​​Jilin Province, mainly distributed in Jilin, Tonghua, Liaoyuan, Yanbian, Baishan and other areas, accounting for nearly 50% of the paddy field area in the province. It is a high-quality rice production area in Jilin Province. The soil in this area is mainly meadow-type white pulp soil and peat soil. The annual active accumulated temperature of ≥10°C is 2400-3000°C, the frost-free period is 120-150 days, the temperature difference between day and night is large, and the ecological microclimate is diverse; in general, the average sunshine hours from May to September are 1000-1200 hours, and the sunshine percentage is 50%. It is an area with low sunshine in Jilin Province; the annual rainfall is 600-700 mm. Low temperature and chilling damage occurs frequently in mid-Ju...

AI Technical Summary

Problems solved by technology

For a long time, there has been a shortage of rice varieties that are both resistant to cold and blast in Jilin Province

For example, Tong 95-74, a rice variety approved in 2002, was planted in Jiaohe City, Jilin Province in 2005. Serious obstructive chilling damage occurred, with a seed setting rate of 30-50%. At the same time, rice blast occurred, resulting in a serious reduction in production.