Method for cultivating wheat cultivar

Abstract

The invention discloses a method for breeding wheat cultivar, comprising the following steps: a. taking a dominant sterility gene Ta1 material as a female parent, and carrying out single cross or multiple cross on a breeding parent material containing required genetic components for combined hybridization to obtain a recurrent selection group CO; b. carrying out mutual hybridization recurrent selection on the descendant of the recurrent selection group CO to obtain a recurrent descendant Cn; and c. breeding the recurrent descendant Cn, building different adverse-situation or non adverse-situation seed selection environments on the same site, and carrying out adverse-situation or non adverse-situation alternate selection and a yield ratio qualification test among generations to cultivate the excellent cultivar of wheat. The wheat cultivar cultivated with the method provided by the invention has the advantages of stress resistance, water saving property, yielding ability and wide adaptability.

Description

technical field [0001] The invention relates to a breeding method, in particular to a method for cultivating wheat varieties. Background technique [0002] Wheat is the food crop with the widest distribution, the largest planting area, the largest total output, and the most abundant processed products in the world. It is the staple food of more than 50% of the world's population. [0003] Over the years, few breakthrough varieties have been bred by wheat breeding. The fundamental reason is that the breeding methods are outdated and the resources are not fully utilized. The current conventional hybrid breeding method has been used for nearly 100 years. The pedigree method of single ecological conditions is used to process the combined offspring, which makes it difficult to express the main target trait genes of the combined offspring at the same time, the genetic type cannot be fully expressed, and the blindness of selection is large and low. Generations of selected material...

AI Technical Summary

Problems solved by technology

[0003] Over the years, few breakthrough varieties have been bred by wheat breeding. The fundamental reason is that the breeding methods are outdated and the resources are not fully utilized.

The current conventional hybrid breeding method has been used for nearly 100 years. The pedigree method of single ecological conditions is used to process the combined offspring, which makes it difficult to express the main target trait genes of the combined offspring at the same time, the genetic type cannot be fully expressed, and the blindness of selection is large and low. Generations of selected materials are basically stable and then identified under different ecological conditions, and are often eliminated because they cannot adapt to a variety of complex environmental conditions

The heavy material burden of the low generation cannot be thrown away until the high generation, resulting in a serious waste of manpower and material resources

[0004] Limited by traditional breeding methods, the more serious problem is that the genetic background of the bred varieties is narrow and the genetic resources are poor, because some non-target genes will be discarded every time the cross selection is selected. Over time, the discarded genes will gradually increase. The genotypes are also becoming narrower and narrower, resulting in some individual traits of the bred varieties being particularly prominent, but poor in broad adaptability, unable to adapt to the changing ecological environment

[0005] From the analysis of genetic theory, the conventional hybrid breeding method carries out 1-2 times of hybridization, using only a few or even 1 main effect gene, the number of pairs is large and very scattered, and is highly correlated with various yield traits and stress resistance traits It is difficult to use the micro-effect genes, and these micro-effect gene groups are the essential basis for high and stable yield

The genetic effects of genes used in conventional cross-breeding methods are mainly complementary effects, while the cumulative and additive effects of genes are difficult to achieve, which is one of the internal reasons why it is difficult to breed breakthrough varieties

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