Breeding method of rice blast-resistant soft fragrant japonica rice

Abstract

The invention relates to a breeding method of rice blast-resistant soft fragrant japonica rice. The breeding method comprises the steps that a japonica rice material which is resistant to rice blast and high in yield is selected as a parent A, a japonica rice material which is resistant to rice blast and early maturing is selected as a parent B, and a material which is low in amylose content, fragrant and not resistant to rice blast is selected as a parent C. Compared with the prior art, a rice blast-resistant rice variety and a soft rice variety which is not resistant to rice blast are hybridized and matched, through the excellent performance of two-time hybridization, multiple-time selfing, parent polymerization and parent stabilization, a molecular marker-assisted breeding technology is used for screening strains which simultaneously carry a rice blast-resistant gene, a soft rice gene and a fragrance gene and consider ripe stage and yield, the existing japonica rice variety is rapidly and accurately improved, and the required rice blast-resistant soft fragrant japonica rice variety is obtained; and the rice variety is high in disease resistance, excellent in rice quality, good in agronomic characters and good in yielding ability.

Description

technical field [0001] The invention relates to the field of rice breeding, in particular to a breeding method for blast-resistant Ruanxiang japonica rice. Background technique [0002] Breeding high-quality, disease-resistant and high-yielding rice varieties is the main goal of modern rice breeding. Among the many rice traits, rice blast resistance, good taste and aroma characteristics have always been the focus of rice breeding experts. Rice blast is one of the most serious diseases that affect the high and stable yield of rice. Breeding multiple blast-resistant gene varieties with different resistance spectrums is one of the effective measures to prevent and control rice blast. At present, Huang Xuan et al. have confirmed that the main resistance genes Pi2, Pi-ta and Pi-b are widely used in rice breeding and production in Zhejiang Province; He Haiyan et al. have proved the resistance frequency of Pi2 gene to physiological races of rice blast in Zhejiang Province 58.87%, ...

AI Technical Summary

Problems solved by technology

[0003]In recent years, Jiangsu, Shanghai and other regions have successively bred a batch of rice varieties with low amylose content and good eating quality, such as "Nanjing 46", "Nanjing Japonica 9108", "Huruan 1212", etc. These soft rice varieties have a better taste and are very popular in the Zhejiang market. However, these varieties have the problem of poor resistance to rice blast

In addition, Zhejiang Province belongs to the mixed indica and japonica rice planting area, and the rice blast bacteria group is complex and diverse. As a result, the local planting of the above-mentioned foreign varieties in Zhejiang often leads to the outbreak of rice blast and serious yield loss.

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