A kind of breeding method of all-fragrant soft rice three-line hybrid rice

Abstract

The invention discloses a full-aroma soft-rice high-quality hybrid paddy rice breeding method. The method comprises the specific steps that: aromatic soft-rice paddy rice maintainer variety I with a genotype of aabb and aromatic soft-rice paddy rice restorer variety VI with a genotype of aabb are screened; aroma-controlling gene a and low grain straight-chain starch content gene b in the aromatic soft-rice paddy rice maintainer variety I and the aromatic soft-rice paddy rice restorer variety VI are respectively introduced into a maintainer line and a restorer line; an obtained maintainer line is transferred to a sterile line, such that an aromatic soft-rice maintainer line III, an aromatic soft-rice high-quality restorer line VIII, and an aromatic soft-rice high-quality male sterile line V with genotype of aabb are obtained; the aromatic soft-rice high-quality male sterile line V is adopted as a female parent, and is matched with the aromatic soft-rice high-quality restorer line VIII, such that the full-aroma soft-rice high-quality hybrid paddy rice Z with the genotype of aabb is obtained. The full-aroma soft-rice high-quality hybrid paddy rice Z has high quality, and is aromatic in every single grain. The rice is soft rice, such that cooked rice is prevented from returning underdone after cooling.

Description

technical field [0001] The invention relates to a hybrid rice breeding technology, in particular to a method for selecting a whole-fragrant soft rice three-line hybrid rice. Background technique [0002] The successful invention and application of indica hybrid rice breeding methods in my country has created huge economic and social benefits, and has been highly appraised at home and abroad. However, hybrid rice is a segregated F 2 Generation seeds, the quality traits are between the parents, the combination of high-quality preparation of both parents, especially the allelism of high-quality trait genes such as fragrance genes, can fundamentally prevent F 2 Genetic segregation of rice grains, so that the internal quality of rice grains does not separate or the separation is controlled to a minimum. Since the physical and chemical indicators of the parents of high-quality three-line hybrid rice in my country have all reached the national excellent level 3 or above, it is di...

AI Technical Summary

Problems solved by technology

However, there are some defects in these fragrant hybrid rice breeding methods: first, the quality of the paired parents is not good, such as high amylose content, not soft rice type, although the paired breeding can obtain full-fragrant hybrid rice varieties or natural ginseng type However, due to the high content of amylose, the rice will regenerate after cold, harden and taste bad; the second is to match the parents, that is, the quality of the sterile line and the restorer line are inconsistent, such as the content of amylose is inconsistent , leading to hybrid rice (F 2 Genetic segregation occurs in the quality and shape of the generation seed) to form mixed rice with different softness and hardness, which is of poor quality and is not easy to cook; third, although both parents of the mating group have fragrance, but because the genes that control fragrance are often unequal, hybrid mating Most of the hybrid rice varieties obtained are not full-flavored varieties

However, compared with hybrid rice varieties, due to the lack of richer genetic basis of hybrid rice varieties, the recombination of more good genes, and the expansion of genetic differences, the yield has always been reduced by more than 20% compared with hybrid rice varieties, resulting in indica in rice production. High-yield hybrid rice, but poor quality, while high-quality aromatic soft rice conventional rice is good in quality, but the situation is low, which cannot meet the increasing requirements of domestic and foreign markets for rice quality, let alone adapt to the national food security strategy and the international market. competing needs of

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