Breeding method for densely planted high-yield Brassica napus hybrid varieties and application of obtained rapeseed hybrid varieties

Abstract

The invention provides a breeding method of close-planting-resistant high-yield cabbage type rape hybrid varieties. The breeding method includes the following steps that existing n1 cabbage type hybrid rape sterile lines and n2 cabbage type rape restoring lines are used for incomplete diallel cross, and F1-generation hybrids are obtained; the F1-generation hybrids are subjected to a field randomized block multiplicating variety comparison cultivation test, obtained test varieties are subjected to grain yield measurement, and high-yield varieties with the yield increased by 5% or above are screened out; the obtained test varieties are subjected to harvest index measurement, and high-harvest-index varieties with the harvest indexes being 3.0 or above are screened out; the varieties meeting the yield increase and harvest index requirements at the same time are determined as high-yield cabbage type rape hybrid varieties; finally the F1-generation hybrids corresponding to the varieties are subjected to high-density planting, and the varieties with the plant save numbers larger than or equal to 80% of the final seedling number are screened out and determined as the close-planting-resistant high-yield cabbage type rape hybrid varieties. The method has the remarkable advantages of being high in product yield, high in applicability, high in universality and the like.

Description

technical field [0001] The invention relates to the technical field of agricultural planting, cultivation and breeding, in particular to a breeding method for Brassica napus hybrid varieties. Background technique [0002] Since the use of rapeseed heterosis to successfully solve the contradiction between high quality and high yield, my country's rapeseed industry has developed rapidly, and the planting area ranks first in the world, and the rapeseed oil production accounts for more than 50% of the domestic edible vegetable oil. However, traditional rapeseed production in my country mostly adopts seedling cultivation and transplanting, mainly in low-density and sparse planting methods. Most of the selected varieties are tall and large plant types, aiming to obtain high yields through the individual advantages of hybrid rapeseed. [0003] In recent years, with the increasingly tense rural labor force, rapeseed production has gradually shifted from traditional seedling raising ...

AI Technical Summary

Problems solved by technology

For a long time, this concept has guided the breeding of rapeseed varieties to mainly focus on plant type traits with large biomass. The harvest index of cultivated rapeseed varieties is generally low, generally only about 2.4, failing to make use of the contribution of light and temperature to yield. Rate