Breeding method of three-line sterile line of indica type rice with high combining ability

Abstract

The invention discloses a breeding method of a three-line sterile line of indica type rice with high combining ability. The method comprises the following steps of firstly, preparing 25 homogeneous restorer lines with different cytoplasm types, then hybridizing the 25 homogeneous restorer lines as a female parent with a newly bred maintainer line, measuring the general combining ability of the maintainer line and the special combining ability of cytoplasm of the maintainer line and the sterile line, determining a donor sterile line providing sterile cytoplasm according to the measurement result of the combining ability, performing transfer breeding of the sterile line by taking the sterile line as a transfer breeding female parent and the maintainer line as a male parent, and after the breeding of a new sterile line, performing combing ability verification by virtue of restorer lines with different sources. According to the breeding method disclosed by the invention, the homogeneous restorer lines prepared in one step can be used for a long time, and can be used as early as possible to determine the combining ability of the maintainer line, and the optimum sterile cytoplasm can be selected to perform transfer breeding of the sterile line so as to ensure that the newly bred sterile line has high combining ability, so that the possibility of idle work and shooting at random of the transfer breeding of the sterile line are reduced. Corresponding measures can be taken for the lines with high combining ability to accelerate the breeding process and improve the breeding efficiency.

Description

technical field [0001] The invention belongs to the technical field of plant variety selection and breeding, and in particular relates to a breeding method for a three-line male sterile line of indica rice with high combining ability. Background technique [0002] Rice is the largest food crop in my country. In the 1970s, Chinese scientists successfully bred the male sterile line of rice nuclear-cytoplasmic interaction, and successfully realized the three-line matching. The rapid promotion of three-line hybrid rice has increased the average yield of rice in my country by 20%, making important contributions to the grain production of my country and the world. However, in the past 10 years, the three-line hybrid rice breeding in my country has been stagnant. The reason, to a large extent, is that the selection and breeding of the new three-line male sterile line has progressed slowly, and there has been no new breakthrough for a long time. [0003] The breeding process of th...

AI Technical Summary

Problems solved by technology

It can be seen that the selection of three-line male sterile lines is not only time-consuming, expensive, and laborious, but also has low breeding efficiency, which is the focus and difficulty of three-line hybrid rice breeding.

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