A method for aggregate breeding of rice varieties with good taste and blast resistance

Abstract

The invention discloses a polymerization breeding method for rice varieties with good taste and resistance to blast disease. Wujing 13 and Kanto 194 are selected for cross-breeding; then F1 and Wujing 15 are used for recrossing, F2 and F3 generation single plants are mixed, and the It carried out molecular marker-assisted selection of dark endosperm mutant gene and rice blast resistance gene, and obtained three genes with dark endosperm mutant genotype Wx‑mqWx‑mq and rice blast resistance genotype Pi‑taPi‑ta and Pi‑bPi‑b. Gene homozygosity; Subsequent generations were selected for yield and agronomic traits, until the F7 generation was selected to produce high-yielding rice with stable and consistent agronomic traits, good taste, and resistance to rice blast. The rice not only has high yield, but is also resistant to rice blast and stripe leaf blight, combines the flexibility of glutinous rice and the elasticity of japonica rice, and has excellent eating quality. Application prospect.

Description

technical field [0001] The invention belongs to the field of rice genetic improvement and biotechnology application, and relates to a polymerization breeding method for rice varieties with good taste and resistance to rice blast. Background technique [0002] At the end of the 20th century, my country began to attach importance to the development of high-quality rice, and high-quality rice has become the primary goal of national japonica rice breeding (Wang Cailin et al., Journal of Jiangsu Agricultural Science, 2008, 24(2):199-203). But at that time, breeders mainly paid attention to the improvement of appearance quality, but little progress was made in the improvement of eating quality. Taking rice varieties in Jiangsu as an example, from 2001 to 2009, a total of 89 new varieties (combinations) of high-quality japonica rice above the national standard level 3 were cultivated. But the eating quality of most varieties can't meet the needs of consumers, and there is a lack o...

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Problems solved by technology

However, this method will not only be affected by factors such as plant growth and development stage and environmental conditions in the process of offspring selection, but also has many problems in the gene aggregation of multiple excellent traits, which is time-consuming and laborious, and the required breeding period is relatively long. long

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