A kind of bacterial blight resistance japonica rice breeding method

Abstract

The invention discloses a bacterial blight-resistant japonica rice breeding method. The steps of the breeding method are as follows: (1) selecting a japonica rice variety / line to be improved and an indica rice resistance source resistant to bacterial blight; Improve japonica rice varieties / lines for crude toxin tolerance concentration identification; (3) cross breeding to obtain three-cross F1 hybrids; (4) anther culture for three-cross F1 hybrids; (5) field planting of flowers and seedlings , a number of japonica rice cultivar families with improved resistance to bacterial blight were harvested from a single plant, and different flower culture families were further planted in the field. Using the japonica rice variety / line parent to be improved as a control, the agronomically good shape and bacterial blight resistance were screened. A new strain of japonica rice with improved sex. The breeding method of the present invention can specifically and efficiently introduce the resistance to bacterial blight of indica rice into japonica rice, and the breeding for resistance to bacterial blight can be completed in about 3 years, which significantly shortens the conventional breeding cycle for resistance to bacterial blight, and has greater breeding efficiency. Value.

Description

technical field [0001] The invention relates to the field of agricultural science and technology, in particular to a rice breeding method for specifically and efficiently infiltrating an indica rice bacterial blight resistance gene into japonica rice, in particular to a bacterial blight-resistant japonica rice breeding method. Background technique [0002] Rice is one of the most important food crops in the world, its cultivated area and total output are second only to wheat. Rice production is particularly important to developing countries, as four-fifths of Asia's 200 million people and one-third of Africa's and Latin America's nearly one billion people depend on rice as their main source of food. my country is the largest rice producing country in the world. According to statistics in the past ten years, the average annual rice production accounts for 36.9% of the world's total rice production, ranking first in the world; the rice sown area accounts for 22.8% of the worl...

AI Technical Summary

Problems solved by technology

However, the transgenic breeding of the rice bacterial blight resistance gene and other superior genes for specific elite main cultivars could have accurately achieved the improvement of indica and japonica crosses. Gene mapping also requires multi-generation hybrid backcrossing in the field, which cannot solve the problem of indica and japonica crossing. In addition, molecular technology breeding has the problems of high cost and high technical threshold, and it is difficult for ordinary breeders to master

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