New bacterial-blight-resisting japonica rice breeding method

Abstract

The invention discloses a new bacterial-blight-resisting japonica rice breeding method. The new bacterial-blight-resisting japonica rice breeding method comprises the following steps that 1, a japonica rice variety / strain to be improved and a bacterial-blight-resisting indica type rice source are selected; 2, coarse toxin tolerance concentration authentication is conducted on the selected japonica rice variety / system; 3, crossbreeding is conduced, and a three-way cross F1 hybrid is obtained; 4, row indica type rice culture medium anther culture is conducted on the three-way cross F1 hybrid; 5, the anther cultured seedlings are planted in a field, a plurality of japonica rice anther cultured strains with improved bacterial blight resistance are harvested and obtained from singular plants, the japonica rice anther cultured strains are further planted in a field, a japonica rice variety / strain parent to be improved is used as a comparison standard, and a new japonica rice strain with good agronomic property and improved bacterial blight resistance is obtained through screening. By the adoption of the new bacterial-blight-resisting japonica rice breeding method, the bacterial blight resistance is specifically and effectively introduced into japonica rice, a bacterial-blight-resisting japonica rice variety can be bred within about three years, the period of conventional bacterial-blight-resisting japonica rice breeding is remarkably shortened, and the new bacterial-blight-resisting japonica rice breeding method has high breeding application 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 a bacterial blight-resistant gene of indica rice into japonica rice, specifically a new breeding method for bacterial blight-resistant japonica rice. 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...

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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