Breeding method for improving hybrid rice quality

Abstract

The invention discloses a breeding method for improving the hybrid rice quality. The method comprises the following steps of: (1) selection of resource materials: selecting X21 introduced from Vietnam as genetic resources of the amylase content, screening out a molecular marker controlling the Wx gene in the amylase content, wherein a maintainer line Q2B with excellent comprehensive agronomic characters bred by Chongqing Municipality Seeds Company is taken as maintainer line backbone parents, and Q2A is taken as a wild abortive type sterile cytoplasm donor, a restorer Shuhui 527 bred by a Rice Research Institute of Sichuan Agricultural University is taken as restorer backbone parents, a restorer R818 bred by Jiangsu Lixia River Agriculture Science Institute is taken as as a bacterial blight resistance donor, and a restorer Chenghui 047 bred by the Crop Research Institute of Sichuan Academy of Agricultural Sciences is taken as a rice blast resistance donor; (2) breeding of a restorer; (3) breeding of a sterile line; and (4) cross combination: taking the cross combination of a sterile line 1A and a restorer R78 to participate a regional trail of Chongqing Municipality in the tenth year, and a continuous trail and a production testing in the eleventh year, and passing the examination of Chongqing Municipality in the twelfth year to receive the name Qingyou 78.

Description

technical field [0001] The invention relates to a breeding method for improving the quality of hybrid rice. Background technique [0002] Hybrid rice is obtained by crossing the female parent with the male parent to obtain hybrid seeds, and then using the first generation of hybrids (F 1 ) to produce rice, hybrid rice has heterosis, which significantly increases yield compared with conventional pure line varieties. The premise of obtaining heterosis is that there is a large genetic gap between the female parent and the male parent, which requires that the female parent and the male parent have different genetic backgrounds and breeding goals. There are large differences in quality traits between the parents bred by the existing hybrid rice breeding technology, because the first generation of hybrids (F 1 ) produced rice is actually the second generation (F 2 ) individuals, their quality traits must be separated. The hybrid rice eaten is a mixture of grains of different qu...

AI Technical Summary

Problems solved by technology

[0005] There are differences between the test quality and the actual quality of the hybrid rice cultivated by the existing technology, and it is impossible to produce high-grade and high-quality varieties with uniform quality among different grains

Due to the inconsistency of the genotypes determining rice quality in the sterile line (female parent) and the restorer line (male parent), the quality traits of the rice produced by the hybrid combination are separated between different grains, and the current legal quality testing method is Take 500 grams of mixed samples for testing. The test value cannot represent the true quality of the grains. The varieties that meet the quality of high-quality rice are actually not high-quality rice. The cooking and eating quality is not as good as that of conventional pure-line varieties with the same test quality, and it is difficult to breed high-quality rice. hybrid rice