Breeding method for sterile line with high outcrossing rate of two-line japonica rice

Abstract

The invention discloses a breeding method for a sterile line of two-line japonica rice with high outcrossing rate, belonging to the technical field of plant breeding. The breeding method is characterized by breeding a sterile line of japonica rice with high stigma exsertion rate firstly, and then crossbreeding the sterile line with a sterile line of two-line japonica rice with excellent characters, thereby breeding a sterile line of two-line japonica rice with high stigma exsertion rate, high outcrossing rate and excellent characters. The breeding method comprises the following steps: (1) breeding a sterile line of japonica rice with high stigma exsertion rate and high outcrossing rate; and (2) crossbreeding the sterile line of japonica rice with high stigma exsertion rate with a sterile line of two-line japonica rice with excellent characters, thereby breeding a sterile line of two-line japonica rice with high stigma exsertion rate, high outcrossing rate and excellent characters. The breeding method has the advantages that the high stigma exsertion rate and high outcrossing rate are obtained, multiplication production and seed production obtain great breakthrough, the innovation of breeding of the sterile line of two-line japonica rice is realized, the sterile line is low in fertility temperature, stable in infertility, excellent in outcrossing property, good in restorability and strong in combining ability and can be widely applied to matching and breeding of new combinations of hybrid japonica rice, and at present, a combination of Li japonica rice 52S is subjected to regional trial in many provinces.

Description

technical field [0001] The invention relates to the technical field of plant breeding, in particular to a method for breeding a two-line japonica male sterile line with high outcross seed setting rate. Background technique [0002] Compared with conventional japonica rice, two-line hybrid japonica rice has strong heterosis, strong stress resistance and high yield. However, the promotion and planting area of ​​two-line hybrid japonica rice is not large, mainly because the yield of two-line hybrid japonica rice is low and the cost of seeds is high, which farmers cannot accept. [0003] The reason for the low yield of seed production is that the stigma exposure rate of the two-line CMS lines of japonica rice is low, generally 0-20%, resulting in low outcross seed setting rate and low yield. The two-line japonica male sterile line is an effective way to increase the yield of seed production. Contents of the invention [0004] The object of the present invention is to provide...

AI Technical Summary

Problems solved by technology

However, the promotion and planting area of ​​two-line hybrid japonica rice is not large, mainly because the yield of two-line hybrid japonica rice seed production is low, and the cost of seeds is high, which farmers cannot accept

[0003] The reason for the low yield of seed production is that the stigma exposure rate of the two-line CMS lines of japonica rice is low, generally 0-20%, resulting in low outcross seed setting rate and low yield. Two-line japonica male sterile line is an effective way to increase seed production yield