Germplasm resource capable of accelerating homozygosis of rice varieties

Abstract

The invention relates to a germplasm resource capable of accelerating homozygosis of rice varieties and belongs to the technical field of rice genetic breeding. The resource comprises a gene type material H224 which can accelerate the homozygosis of the rice varieties. The material belongs to a partial japonica type conventional rice germplasm resource. The gene material is hybridized with the rice varieties with different plant types and different sub-species (nonglutinous rice and japonica rice); all combinations receive a single spike in F1 generation; a group with more than 100 plants is formed on each single spike in F2 generation; more than 98% of the homozygosis state is represented in 10% of a single spike group in each family; F3 generation has 20% of mono-system homozygosis and F4 generation has 30% of the mono-system homozygosis; and the homozygosis possibility is the lowest numerical value in all the combinations. With the adoption of the gene germplasm resource, the homozygosis speed of rice filial generations is accelerated, the breeding cycle is shortened and the breeding efficiency is improved; the production varieties are usually changed and new; and the occurring possibility of large-scale diseases is reduced, the safety of national grains is guaranteed and the high yield and high efficiency are further realized.

Description

technical field [0001] The invention relates to an accelerated homozygous germplasm resource of rice varieties, belonging to the technical field of rice genetics and breeding. Background technique [0002] Conventional rice breeding methods mainly include pedigree method, group method, etc. At present, various breeding units mainly adopt conventional breeding methods, and the offspring involve gradual and slow homozygous steps. In order to speed up the homozygous speed of new rice lines, breeders have used many One method, such as haploid technology, uses chromosome doubling to make the material directly homozygous in theory, but the results obtained are not satisfactory. Haploid technology can only obtain dominant effects, epistatic effects, etc. in genetics, as Key plant types such as rice yield are all quantitative traits, which play a greater role in the genetic additive effect of genes, while the direct homozygosity of haploid technology ignores the additive effect of g...

AI Technical Summary

Problems solved by technology

The technical breeding of existing rice varieties has a long period of time, requires a large amount of land resources, and invests too much manpower and material resources, resulting in low economic benefits