Intersubspecific indica type three-line hybrid rice restorer line breeding method

Abstract

The invention discloses an intersubspecific indica type three-line hybrid rice restorer line breeding method, which employs the indica type three-line hybrid rice restorer line as female parent and the japonica-clinous intermediate type wide-compatible variety as male parent for hybridization; F2 and filial generations are sown during May 20th-25th, and the colouring at later period is used as a first elimination index, and a pedigree method with other integrated agronomic characters is applied for selection till a stable line with good colouring at later period and excellent integrated agronomic characters are acquired; a 2-3 years combining ability determination is carried out for the stable line, and colouring of the test cross F1 at later period is observed; the selected indica type intersubspecific three-line hybrid rice restorer line is required to have good colouring at later period with excellent integrated agronomic characteristics, and the corresponding test cross variety is required to have superior advantages and good colouring at later period. The invention has the advantages that the restorer line and the hybrid rice combination configured using the restorer have strong vitality of root, lasting vitality of functional leaf, difficult premature senility, good colouring at later period, good strain shape, and superior advantage.

Description

technical field [0001] The invention belongs to the technical field of plant variety breeding, and in particular relates to a breeding method for an inter-subspecies indica three-line restorer line. Background technique [0002] Rice is the largest food crop in my country. Since the 1970s, Chinese scientists have successfully bred rice nuclear-cytoplasmic male sterile lines and photothermo-sensitive genic male sterile lines, and successfully realized three-line and two-line matching. The rapid promotion of hybrid rice has increased the average yield of rice in my country by 20%, making an important contribution to the grain production in my country and the world. However, in the past 10 years, my country's rice production has been stagnant. The reason is, to a large extent, that the breakthroughs in hybrid rice breeding are hybrid breeding between varieties within a subspecies, and the germplasm resources and breeding potential within a subspecies have been fully utilized a...

AI Technical Summary

Problems solved by technology

However, some of the indica restorer lines selected by the existing breeding methods have too little introgression and japonica, which leads to insufficient advantage of the hybrid combination, and some have too much introgression and japonica, which leads to the configuration of a hybrid combination that is super-parental, late-maturing, and low in fertility. It is difficult to grasp the "degree" of indica and japonica introgression, and it is difficult to improve the breeding efficiency

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