Efficient breeding method for early-maturing, high-yield and multi-resistant Brassica campestris L.

Abstract

The invention discloses an efficient breeding method for early-maturing, high-yield and multi-resistant Brassica campestris L. and belongs to the field of crop genetic breeding. As resistance and yielding capacity of the tetraploid Brassica napus L are introduced to early-maturing and eurytopic diploid Brassica campestris L. through hybridization, selfing, recombination and rearrangement of genomes, the variety of Brassica campestris L. with superiority such as early-maturity, stress resistance, quality and yielding capability of the two types of parents is bred by means of phenotype and cytology investigation. The early-maturing, high-yield and multi-resistant variety of Brassica campestris L. bred by the method has the advantages of early-maturity, high disease resistance, high lodging resistance, high yielding capacity and the like, can substitute for local early-maturing Brassica campestris L. with low lodging resistance and disease resistance and low yield in double cropping rice planting regions, the bottleneck of early blossoming without early maturing in terms of early-maturing breeding of the Brassica napus L. at present is broken, and the difficulty in breeding of early-maturing brassica campestris is overcome effectively.

Description

technical field [0001] The invention relates to a method for selecting a cabbage-type rape with early maturity, good resistance, excellent quality and high yield, belonging to the field of crop genetic breeding. Background technique [0002] Rapeseed is an important oil crop in my country. The rapes cultivated in my country mainly include Brassica napus, AACC, 4x=2n=38, Brassica rapa, AA, 2x=2n=20 and Brassica juncea, AABB, 4x=2n=20. 36) Three types. Among them, Brassica napus is formed by natural hybridization and chromosome doubling of Chinese cabbage and Brassica oleracea (CC, 2x=2n=18). China is one of the largest rapeseed producers and consumers in the world. Rapeseed oil accounts for 40% of my country's edible oil and is the most important edible vegetable oil in China. In recent years, the planting area of ​​rapeseed in China has been 7.3 million hectares per year 2 Above, the total output of rapeseed remained at more than 12 million tons. In recent years, Chi...

AI Technical Summary

Problems solved by technology

Possibly due to the influence of flowering genes in the C genome on early maturity, there has been no breakthrough in the breeding of early-maturing (early flowering and early-maturing) Brassica napus with the same early maturity as Brassica napus, that is, it is difficult to breed to the same level as Brassica napus precocious

As a result, there are very few excellent early-maturing varieties that can meet the national requirements and have great potential in rapeseed production in double-cropping rice areas.