Chinese cabbage hybrid breeding process

Abstract

The Chinese cabbage hybrid breeding process features that the process includes interspecific crossing with cabbage type rape radish cytoplast male sterile material RC97-1 as female parent and Chinese cabbage self-bred line 1138 as male parent to obtain transfer bred primary generation seed, selecting the excellent single plant as the backcross female parent for the next turn; continuous seven-generation backcross transfer breeding, economic character selection, disease resistance identification to obtain Chinese cabbage cytoplast male sterile material RC7 with stable sterility and economic character the same as that of corresponding maintainer line; and the further crossing with the Chinese cabbage cytoplast male sterile material RC7 as male parent and Chinese cabbage self-bred line 04S245 as male parent to obtain the Chinese cabbage hybrid. The Chinese cabbage hybrid Jingqiu-70, or RC7*04S245, has the features of early ripening, compact plant, high disease resistance, etc.

Description

technical field [0001] The invention relates to the technical field of crop heterosis utilization, 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 Chinese cabbage hybrids mainly adopts self-incompat...

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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