A kind of breeding method of broccoli

Abstract

The invention discloses a breeding method for broccoli. The method comprises the following steps: hybridizing original broccoli self-incompatible line (male parent) and broccoli (fertile, female parent) in a castration flowering period, and then backcrossing for four generations in the next castration flowering period and freely pollinating by bees between the plants in the flowering period. On the one hand, the original parent is purified and rejuvenated, on the other hand, through the repeated pollination in the flowering periods of various generations, the original self-incompatible property of the parent is weakened, the selfing affinity is enhanced, the self-incompatible line is gradually converted into the selfing line, the breeding efficiency is improved for the breeding by utilizing the cytoplasm male sterility line, the defect of bud-peeling pollination in manual bud stage required by the self-incompatible line breeding is overcome and a new method for purifying and rejuvenating broccoli is found on the basis of the character degrading phenomena of the perennial selfing parent due to the purification and rejuvenation, such as strong plant growth, low bud losing rate, high pollen quantity and high setting percentage.

Description

technical field [0001] The invention relates to a breeding method for broccoli, and belongs to the technical field of broccoli breeding. Background technique [0002] Broccoli (Brassica deracea L.var italic P), also known as green cauliflower and broccoli, belongs to a variant of the Brassica cabbage species of the cruciferous family that uses green curds as the product. Its edible parts are green young stems and buds. It is rich in nutrients, contains protein, sugar, fat, vitamins and carotene, and contains glucosinolates, which have anti-cancer effects and are well received by consumers. It has now become a high-end green vegetable in the international market. Broccoli is a kind of high-quality, high-grade functional green vegetables with a perfect combination of deliciousness and health care. At present, the vegetable base is planting broccoli on a large scale to supply domestic and foreign markets. [0003] Since the late 1990s, my country has introduced some foreign v...

AI Technical Summary

Problems solved by technology

The previously accumulated good self-incompatibility line parent materials are facing elimination or upgrading. For example, long-term continuous self-trading will cause viability degradation, and some excellent traits will be lost, such as weak plant growth, high bud failure rate, and less pollen. The hybridization rate of hybrids is difficult to reach 100%, especially the self-incompatible lines need to be artificially pollinated at the bud stage, the workload is heavy, and the parents are difficult to reproduce.

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