Efficient japonica rice breeding method

Abstract

This invention belongs to the technical field of plant variety breeding, and provides an efficient japonica rice breeding method. The method comprises the steps that after obvious disadvantaged plants are eliminated through an F2 generation of a high yield combination, mixed harvesting of optimized groups and intermediate groups is performed, and mixed seeds of the optimized groups and intermediate groups are reserved according to the ratio of 3:1; when an F3 generation tends to become a stable generation, greenhouse facilities and a Hainan southward propagation generation-adding technology are adopted to perform intensive improvement and mixed selection treatment. By adopting modes of low nitrogen fertilizer, thick direct seeding, dark treatment or warming, rice paddy selecting, chaff shearing and seed reserving during heading period, dormancy breaking and the like, the method realizes that three generations in one year can effectively shorten 1 to 2 years of the breeding cycle, and simultaneously also has the advantages that the colony compatibility of a breed variety, the resistance to high and low temperature and the quality of rice are improved, and the like, and effectively improves the breeding efficiency.

Description

technical field [0001] The invention relates to a plant seed breeding test technique, in particular to a high-efficiency japonica rice breeding method. Background technique [0002] Rice is the most important food for our people, and the rice breeding project is a strategic measure to ensure food security; breeding and substituting are an indispensable part of breeding work and an important measure to shorten the breeding cycle. The effective accumulated temperature (ΣT≥10°C) in the middle and lower reaches of the Yangtze River is 4500-7000°C·d, and double-cropping rice (mostly indica rice in the first crop and japonica rice in the second crop) can be planted. At present, in the middle and lower reaches of the Yangtze River, only one generation is completed in the main season every year. Combined with the addition of off-site breeding in the south, two generations can be realized in a year. [0003] There are pedigree methods and mixed selection methods to deal with hybrid ...

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: In order to solve the problems in the prior art that there will be a large deviation between the breeding effect and the expectation, and even the entire breeding program fails, the purpose of the present invention is to provide a japonica rice that can shorten the breeding period and improve the breeding effect Breeding method