Cabbage hybrid breeding method

Abstract

A method for selectively culturing the cytoplasmic male sterility line of Chinese cabbage includes such steps as choosing the cytoplasmic male sterility line of cabbage-type rape (or radish) RC97-1 as female parent and the selfing line of Chinese cabbage '1138' as male parent, hybridizing, choosing excellent plant as the female parent for backcrossing, backcrossing by continuous 7 generations while choosing the high-yield and disease-resistant plants for backcrossing to obtain RC7, and hybridization between the resultant RC7 as female parent and selfing line of Chinese cabbage 03 S1207.

Description

technical field [0001] The invention relates to the technical field of crop heterosis utilization, and relates to a method for breeding hybrids, in particular to a method for breeding Chinese cabbage hybrids. Background technique [0002] Chinese cabbage (Brassica campestris L. ssp. pekinensis (Lour) Olsson), also known as head cabbage, yellow sprouts, and stuffed cabbage. It belongs to the subspecies of Brassica Brassica species that can form leaf balls, and is a biennial herb. Originating in my country, it is the staple vegetable with the widest distribution, the largest cultivation area and the largest number of people in my country. In the mid-1980s, my country's Chinese cabbage production has basically achieved heterogeneous optimization, although in recent years, the variety of Chinese cabbage varieties has continued to increase, and new varieties have emerged in an endless stream. But at present, the breeding of the first generation of Chine...

AI Technical Summary

Problems solved by technology

But at present, the breeding of the first generation of Chinese cabbage hybrids mainly adopts self-incompatibility lines. This method has the disadvantages of high production cost of the original species, easy decline of the viability of the parents and the occurrence of false hybrids, and the purity of the variety cannot be guaranteed; secondly , is to use nuclear gene interaction male sterile line and Polima cytoplasmic male sterile line to produce hybrid generation

The sterility degree and sterile plant rate of the nuclear gene interaction male sterile line can reach 100%, and dominant hybrids can be formulated, and the seed collection amount is also high. The disadvantage is that the transfer of the male sterile line is quite difficult. The prepared hybrid is a three-cross species, and the purity of the hybrid is also affected to a certain extent; the Polima cytoplasmic male sterile line often has a small amount of pollen under certain temperature and humidity changes, showing unstable fertility, which also affects the quality of the hybrid

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