Method for breeding cabbage type rape recessive epistasis interaction genic male sterility two type line

Abstract

The invention discloses a method for breeding two-type lines of recessive epistatic interaction genic male sterile in Brassica napus. The method selects excellent recessive genic male sterile two-line male sterile line B strains for self-bagging, and obtains self-bred sterile Fertility segregated rapeseed plants; the obtained self-sterility segregated rapeseed plants are recurrent parents, which are backcrossed with the recessive epistasis inter-GMS two-type line, and self-crossed and testcrossed in the backcrossed progeny population to obtain A new recessive epistatic interaction genic homozygous two-type line; the recessive epistatic interaction genic homozygous two-type line was test crossed with the Lingbao line, and a total sterile line with 100% sterile plants was obtained. The invention has the advantages of simple breeding procedure, fast speed and strong operability, and the obtained homozygous two-type line has stable genetics and high combining ability, and can be conveniently applied to the breeding of new varieties of recessive epistatic interaction sterility hybrid rapeseed.

Description

technical field [0001] The invention belongs to the technical field of rapeseed breeding, and in particular relates to a new method for breeding two-type lines of recessive epistatic interaction genic male sterile in Brassica napus. Background technique [0002] Rapeseed has strong heterosis, and good hybrid combinations can generally increase yield by 20% to 30%. Since the first approved and widely planted hybrid rapeseed Qinyou No. 2 was bred in 1985, the production of hybrid rapeseed has developed rapidly in my country. At present, the way of rapeseed hybrid utilization is mainly the male sterility of rapeseed. The key to the utilization of rapeseed male sterility is to obtain 100% sterile population during hybrid production, and the recessive nuclear sterile two lines can only obtain 50% during hybrid production. For sterile groups, the production of hybrids is time-consuming and labor-intensive, and the purity of the seeds is difficult to guarantee, and the yield of se...

AI Technical Summary

Problems solved by technology

The vast number of rapeseed breeding scientific and technological workers use this as the basic material to genetically improve the three-line recessive genetic male sterile material, but the breeding cycle of each rapeseed breeding unit is long, which is rare. Since researcher Chen Fengxiang discovered the recessive nuclear male sterile After 30 years of breeding practice, only a dozen of three-line male sterile varieties have been approved and promoted nationwide.

Images