Breeding method of granular indica-japonica intermediate type wide-compatibility restorer line

Abstract

The invention relates to a breeding method of a granular indica-japonica intermediate type wide-compatibility restorer line, which comprises the following steps of: hybridizing one of conventional granular japonica rice, a restorer line or a maintainer line with the indica-japonica intermediate type wide-compatibility restorer line, then performing selfing to obtain a further generation, observing the grain type of each single plant of a segregation population, selecting granular single plants with excellent plant leaf morphology from the plants to harvest seeds, carrying out continuous multi-generation selfing, selecting the grain shape and the plant leaf morphology of each single plant of each plant line in each generation by taking the plant line as a unit, and carrying out continuous multi-generation selection to obtain the granular indica-japonica intermediate type wide-compatibility restorer line with genetic stability. The method is high in operability, does not need high-precision complex steps for cultivation, and is high in universality.

Description

technical field [0001] The invention relates to a breeding method for an indica-japonica intermediary wide-compatibility restorer line, belonging to the technical field of rice breeding. Background technique [0002] The use of heterosis has greatly increased the yield of rice in my country. At present, the planting area of ​​hybrid rice accounts for about 50% of the total planting area of ​​rice in my country. The breeding of new hybrid rice varieties is the original driving force for the development of the hybrid rice industry. In the early days, the hybrid rice varieties bred in my country were mainly intra-subspecies hybrid rice, and mainly concentrated in the indica subspecies; At the same time, due to the huge advantages in yield and resistance, more and more new hybrid rice varieties between indica and japonica subspecies have been approved in recent years, which has further improved the utilization level of rice heterosis in my country. It has improved and promoted th...

AI Technical Summary

Problems solved by technology

Most of the restorer lines of indica-japonica inter-subspecies hybrid rice are indica-japonica intermediary restorer lines selected through introgression crossing between indica and japonica. Between different grain types, the aspect ratio is about 2.4, and there are few recovery lines of aggregate type, which cannot meet the production needs of various grain types.