Breeding method of rape with high-density siliques on main inflorescence and application

Abstract

The invention discloses a breeding method of rape with high-density siliques on a main inflorescence and application. The breeding method comprises the following steps: adopting double-2 in the variety of cabbage type rape and nepeta oil-2 in the variety of cabbage type rape as parents for hybridization to obtain F1, and conducting bagged selfing propagation to obtain a segregated population; selecting single plants in the segregated population to conduct identification on phenotypic characteristics in the field continuously for 4 years, selecting single plants with high-density siliques on the main inflorescence (number of effective siliques on the main influorescence / main-inflorescence length being greater than 2 pieces / cm); in a flowering period, selecting flower buds 2.5-3.5mm in length on the main inflorescence, using colchicine to double chromosomes, using microspores for culture to obtain a double-haploid population, and selecting single plants to breed into strain with high-density siliques on the main inflorescence and stable characters; using the strain and double 11 in the variety of cabbage type rape (the density of siliques on the main inflorescence is about 1.7 pieces / cm) to conduct hybridization, utilizing F2:3 populations to conduct genetic segregation analysis and finding that the characters of the high-density siliques are controlled by 2 pairs of additive-dominant-epistatic main genes. The breeding method and the application disclosed by the invention have the advantages that the variety of rape with high-density siliques on the main inflorescence can be bred by utilizing hybridization of the high-density silique materials on the main inflorscence and common rape, and the yield per unit of the rape can be greatly increased.

Description

technical field [0001] The invention relates to the technical field of rapeseed breeding, in particular to a breeding method and application of high-density silique rapeseed in the main inflorescence. Background technique [0002] Brassica napus belongs to the Brassicaceae ( Cruciferae ) Brassica ( brassica ), is the second largest bulk oil crop in the world, not only the main source of edible oil, but also an important economic crop that provides biodiesel and other industrial raw materials. China's annual planting area exceeds 7 million hectares (100 million mu), and the rapeseed output exceeds 10 million tons, ranking first in the world in both area and total output. In recent years, the gap between domestic supply and demand has been increasing. In 2014, under the condition of controlling the import volume, the import volume of rapeseed was as high as 5.081 million tons, and the rapeseed oil was 810,000 tons. It has become the world's major rapeseed importer. As the ...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is: to provide a kind of breeding method and application of rapeseed with high density of main inflorescence and high density of main inflorescence of rapeseed, which can be bred to obtain high density of main inflorescence of rapeseed variety, so as to solve the bottleneck problem of increasing production by close planting cultivation in current rapeseed production

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