Selection method for onion male sterility maintainer line

Abstract

The invention discloses a selection method for an onion male sterility maintainer line. Selection of a maintainer line with a good character is a core technology for updating first-generation hybrid seeds of onions. The invention provides a maintainer line selection method customized according to a cytoplasm-nuclear interaction type sterility genetic theory. The technical key point is that the sterile line is hybridized with varieties of which the economic character and the combining ability meet the requirement after strict selection, and then hybridation and selection steps such as backcross and selfing are carried out to artificially synthesize a maintainer line of which the gene type is Nmsms. By the technology for introducing a genic male sterility gene ms of the typical sterile line (Smsms) into a fertile variety or strain (NMsMs) with a good character, selection of the gene type of the maintainer line is completely predictable; furthermore, advanced and strict selection is allowed during determination of a basic material, and the direction of selection of the economic character of the maintainer line is controllable, so that the blindness of the conventional selection method is overcome, and the selection efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of onion heterosis utilization, and relates to a method for breeding male sterile maintainer lines of onion. Background technique [0002] my country is a big onion producer and exporter in the world, but its breeding is backward. At present, there is no self-cultivated F in my country. 1 Substitute varieties, planted F 1 The substitute varieties are all imported from abroad, and the seed cost per hectare is 6000-9000 yuan, accounting for 40-60% of the total production cost. In view of the current situation of low onion production efficiency in my country, onion F 1 Research on breeding of new generation hybrids is a prerequisite for improving onion productivity in my country. onion 1 The main way of generation breeding is to use the three-line method of nuclear-cytoplasmic interaction male sterility, which needs to have a sterile line, a maintainer line and a restorer line at the same time. By crossin...

AI Technical Summary

Problems solved by technology

The result of this is that not only the number of combinations prepared is too large, the workload is too large, and a lot of manpower and material resources are required; more importantly, even if the plants with the ability to maintain are screened, their economic characters are difficult to meet in most cases. breeding requirements