Method for creating weak-photosensitivity japonica rice germplasm

Abstract

The invention provides a method for creating weak-photosensitivity japonica rice germplasm. The method comprises the following steps: (1) selecting a japonica rice line 1 with the genotype of hd1 + ehd1 + sdg725 and a japonica rice line 2 with the genotype of Hd1 + Ehd1 + SDG725 in the heading stage as parents; (2) performing continuous selfing after hybridization, and obtaining a recombinant selfing line group by using a single seed transmission method; and (3) screening homozygous families of different genotype combinations by using a molecular marker technology, and selecting families with small variation amplitude of full-heading period (days from sowing to full heading) and yield increasing potential under long-day and short-day conditions to obtain a new japonica rice strain with the genotype of hd1 + ehd1 + sdg725 (late-maturing line) or hd1 + ehd1 + SDG725 (early-maturing line) in the heading period. According to the low-sensitivity japonica rice strain cultivated by the method, the planting adaptability in southern rice areas can be improved, and the complex crop rotation requirements in different popularization areas can be selectively met. In addition, phenotypic selection of important agronomic traits in shuttle breeding and high-throughput genotyping of target genes Ehd1 and SDG725 are facilitated, and the breeding efficiency is improved.

Description

technical field [0001] The invention belongs to the field of crop genetics and breeding, and in particular relates to a method for creating germplasm of weakly light-sensitive japonica rice. Background technique [0002] The area of ​​japonica rice in China is about 150 million mu per year, almost 100% of which directly guarantees "food security"; it is mainly distributed in the Northeast rice region and the Jianghuai rice region. The planting areas of the three northeastern provinces and Jiangsu account for about 43.0% of the total area of ​​japonica rice in the country. and 26.0%. With the development of the economy and the improvement of people's living standards, the area of ​​japonica rice consumption has rapidly expanded from the original Northeast, Beijing, Tianjin, Shanghai, and Jiangsu and Zhejiang areas to large and medium-sized cities in Central South and South China. The south has become the largest japonica rice consumption area in China. In order to better mee...

AI Technical Summary

Problems solved by technology

[0005]However, only creating a simple hd1+ehd1 weakly photosensitive japonica rice germplasm cannot meet the intricate stubble needs in different promotion areas, such as local farming systems, The safe full heading period and the best filling period have more specific requirements on the heading date of varieties, and more precise molecular regulation of the heading date (sowing full period) is required

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