Breeding method of multi-resistance rice germplasm

Abstract

The invention relates to a breeding method of multi-resistance rice germplasm, belonging to the technical field of biology. The breeding method is as follows: a parent P1 simultaneously carrying anti-xanthomonas oryzae gene Xa21 and Xa23 and a parent P2 simultaneously carrying anti-rice blast disease gene Pi-Kh and Pi-1 as parent raw materials, and Pi1, PiKh, Xa21 and Xa23 dispersed in different resistant sources are guided into the same rice germplasm by convergent cross and molecular marker-assisted selection technology, so that the new rice germplasm carrying multi-resistance-section is created, and the resistance of the parent of good hybrid rice can be improved rapidly by utilizing the multi-resistance germplasm. The germplasm can be directly used for preparing anti-disease hybrid rice combination, and also can be taken as the resistant source of the parent of a new circle of anti-disease hybrid rice. More importantly, a plurality of multi-disease genes can be guided into the same one breeding group by one-time hybridization of the multi-resistance germplasm, so that the breeding time is shortened greatly, and the breeding efficiency is improved.

Description

technical field [0001] The invention relates to a method for breeding multi-resistant rice germplasm, which belongs to the field of biotechnology. Background technique [0002] Rice plays an important role in food production, but the problem of disease resistance of rice is still very prominent. Most of the approved varieties or combinations are not strong resistant, and few varieties are resistant to two major diseases at the same time. The main reasons for the above situation are as follows: 1. At present, most breeding units adopt traditional breeding methods for disease resistance breeding, and the breeding efficiency is low; 2. There is a lack of resistance sources with excellent comprehensive traits, and the breeding period is long; 3. The lack of simultaneous carrying There are germplasms with multiple known disease resistance genes, and the breeding efficiency is low. Therefore, creating rice parents carrying multiple disease-resistant genes is of great significance...

AI Technical Summary

Problems solved by technology

At present, there have been a few research reports on the introduction of 2-3 disease resistance genes into rice by marker-assisted selection technology, but they are all aggregated for resistance genes scattered on different chromosome segments, and no rice disease resistance genes have been found. A report on the creation of multi-resistance rice germplasm based on the characteristics of "cluster distribution"