Method for breeding three-line rice strong restoring line H570

Abstract

The invention discloses a method for breeding a three-line rice strong restoring line H570. The method comprises the steps of taking an inbred line of a hybrid generation F4 of 422 turns of hybridizing of a javanica rice material WL1312 and a japonica type wide compatible material as a female parent; the female parent is hybridized with a strong restoring line Minghui63 which is popularized and applied in a large area in production; a wide compatible strong restoring line DI508 is successfully bred through system selection of a plurality of years and generations and resistance evaluation of different ecological regions; DI508 dried seeds are subjected to radiation and mutagenesis, and a traditional breeding concept that seed breeders usually select early ripe single plants from variation groups for a long period is changed. Ultra-compatible and late-ripe varied single plants are selected from the variation groups HK2 of radiation and mutagenesis generations of the DI508, and are directionally selected in Hainan and Zhejiang, so that the restoring line H570 is finally bred. The H570 is strong in restoring capability, good in matching ability, excellent in agronomic characters, and high in post-period functional leaf photosynthetic efficiency.

Description

technical field [0001] The invention belongs to the technical field of three-line hybrid rice breeding, and in particular relates to a method for breeding three-line strong restorer line H570 of rice. Background technique [0002] One of the main contents of the research on three-line hybrid rice breeding is the selection of parental restorer lines. The restorer genes of hybrid rice are mainly derived from low-latitude indica rice in South Asia. The methods for breeding restorer lines of three-line hybrid rice mainly include testcross screening, cross breeding and radiation mutagenesis. Traditional breeding techniques generally introduce restorer genes directly into varieties with excellent comprehensive traits through sexual hybridization technology, and then breed stable restorer lines through multiple generations of testing and restoration selection. The selection and breeding of restorer lines can be divided into two periods of development: one is in the early stage of...

AI Technical Summary

Problems solved by technology

But at present, the leaves of indica-type three-line hybrid rice are generally soft, thin, draped, and loose, and the plant type has not changed much.

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