Breeding method of brassica napus capable of being specially adopted as green manure

Abstract

The invention relates to a breeding method of brassica napus variety capable of being specially adopted as a green manure. The method comprises that brassica oleracea type hybrid brassica campestris is selected as the female parent and is subjected to interspecific hybridization with white brassica parachinensis to obtain a F1 generation hybrid species; the F1 generation hybrid species and the female parent are subjected to backcrossing to obtain BC1F1 seeds; the seeds are cultivated and are subjected to selfing to obtain BC1F2 seeds; the single plant having the chromosome number close to the brassica campestris female parent is selected to carry out selfing to obtain BC1F3 seeds; the single plant having the chromosome number n of 19 is further selected to carry out selfing to obtain BC1F4 seeds; and the BC1F4 seeds are subjected to subsequent multi-generation selfing, wherein the short growth period of the plant is adopted as the main limiting target character during the multi-generational selfing process and the consistent directional system selection in the line is performed until the brassica napus variety capable of being specially adopted as the green manure is obtained. With the breeding method of the present invention, the brassica napus variety capable of being specially adopted as the green manure and with characteristics of short growth period, strong adaptability, high biological yield and low seed production cost can be bred out.

Description

technical field [0001] The invention relates to the technical field of agricultural planting, cultivation and breeding, in particular to a method for breeding rapeseed. Background technique [0002] In my country's traditional agriculture, green manure is one of the important sources of biological nitrogen and organic fertilizer, and its cultivation and utilization have an important position and significance. The 1970s was the peak period of green manure planting in my country, and the planting area reached more than 200 million mu. After that, due to the adjustment of the planting industry structure, the reform of the crop rotation system, the increase of the multiple cropping index, and the substantial increase in the amount of chemical fertilizers, the green manure area decreased year by year. However, due to the large-scale application of chemical fertilizers, the amount of organic fertilizers has been greatly reduced, which has led to the deterioration of the physical a...

AI Technical Summary

Problems solved by technology

However, in modern agriculture, green manure has less and less significance as a source of crop nutrients, but it has very important strategic significance in improving soil, fertilizing soil, ensuring high-quality and stable crop yields, developing sustainable agriculture, and protecting the ecological environment.

[0003] At present, the green manures used in production mainly include leguminous crops such as milk vetch and cruciferous crops such as common rapeseed, which generally have defects such as narrow sowing period, slow growth, small biomass, poor adaptability, and high seed cost. How to select and breed a kind of green manure that more meets the requirements of modern agriculture is of great significance to those skilled in the art

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