Novel indica-japonica hybrid gene introgression sheath blight resistance breeding method

Abstract

The invention discloses a novel indica-japonica hybrid gene introgression sheath blight resistance breeding method. The novel indica-japonica hybrid gene introgression sheath blight resistance breeding method includes the following steps that (1), an indica-japonica variety/system to be improved and a sheath blight resistance indica-japonica resistance source are selected; (2), the toxin tolerance concentration of the selected indica-japonica variety/system to be improved is roughly identified; (3), a three-way cross F1 hybrid is acquired through cross breeding; (4), row indica culture medium anther culture is conducted on the three-way cross F1 hybrid; (5), anther-cultured seedlings are planted in a large field, multiple indica-japonica anther culture families with the improved sheath blight resistance are acquired through single-seedling harvesting and planting, the different anther culture families are further sown in the large field, a parent of the indica-japonica variety/system to be improved serves as a contrast, and the new indica-japonica strain with the good agronomic character and the improved sheath blight resistance is screened out. By the adoption of the novel indica-japonica hybrid gene introgression sheath blight resistance breeding method, indica-japonica sheath blight resistance genes can specially and efficiently seep into indica-japonica, sheath blight resistance breeding can be finished about three years, a conventional indica-japonica hybrid sheath blight resistance breeding period is remarkably shortened, and the high breeding application value is achieved.

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 sheath blight resistance gene into japonica rice, specifically a new indica-japonica cross gene introgression resistance to sheath blight breeding method. Background technique [0002] Rice sheath blight (rice sheath blight), commonly known as rotten feet, flower stalks, and foot blight, is one of the important diseases in rice production and is a disease of rice all over the world. The disease was first discovered in Japan in 1905, and was reported in my country in 1934, and then spread rapidly and spread to Africa, Europe and the Americas. At present, the disease has generally occurred in rice-growing countries in Asia, Africa, Europe, and the United States. It generally reduces production by 10% to 30%, and can reach 50% in severe cases. It poses a great threat to rice produc...

AI Technical Summary

Problems solved by technology

However, the transgenic breeding of the sheath blight resistance gene and other superior genes for specific elite main cultivars could have accurately achieved the improvement of indica and japonica crosses. , which 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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