Breeding method for cultivating Huang-Huai japonica rice variety by utilizing cold region rice germplasm resources

Abstract

The invention discloses a breeding method for cultivating a Huang-Huai japonica rice variety by utilizing cold region rice germplasm resources. Northeast cold region japonica rice variety with higher temperature sensitivity and Jiangsu early-maturing late japonica rice variety with higher light sensitivity are hybridized as parents, F1, F5 and more generations are transplanted, F2 and F4 middle and low generations are directly seeded, by reasonable seeding time, the seedling height, the full heading stage, the plant height and the maturing rate are taken as selection pressure, mixed harvesting is performed on F1-F4 to reserve seeds, single harvesting is performed on F5 and more generations to reserve seeds, strains are established from F6, and an optimal strain is selected according to a pedigree method until a stable strain is obtained and is promoted to participate in each stage of intermediate test. The japonica rice variety cultivated by the method is relatively weak in light sensitivity, relatively high in temperature sensitivity and relatively early in ripening period, has excellent characteristics of two different japonica rice varieties in rice cropping ecological regions, has wider adaptability, and is suitable for being planted in Huang-Huai japonica rice regions in China.

Description

technical field [0001] The invention relates to the field of breeding methods, in particular to a breeding method for cultivating Huanghuai japonica rice varieties by utilizing rice germplasm resources in cold regions. Background technique [0002] my country is the country with the largest japonica rice planting area and the highest total yield in the world. Although the planting area of ​​japonica rice only accounts for 1 / 4 of the total planting area of ​​rice, almost 100% of it is directly consumed as rations. Therefore, in a certain sense, the core of ensuring food security is rations, and the focus of ration supply is rice. The key is japonica rice, and the cultivation of japonica rice varieties is of great significance. Japonica rice varieties can be divided into early-maturing japonica rice, middle-maturing japonica rice and late-maturing japonica rice according to their growth stages. The japonica rice varieties mainly planted in Jiangsu's coastal and southern Jian...

AI Technical Summary

Problems solved by technology

However, due to the distant relationship between the parents, F 2 -F 4 The mid- and low-generation segregation is large and rich in types, and the frequency of excellent individuals that meet the breeding goals is extremely low. For a long time, the efficiency of directly using the pedigree method to deal with the mid- and low-generation breeding is not high. Japonica rice varieties

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