Establishment and selection method of recurrent selection population for high-quality multi-resistance tobacco new line breeding

Abstract

The present invention relates to a recurrent selection population creation and selection method for the breeding of high-quality multi-resistant tobacco new strains. First, the high-quality parent and the wide-fit parent are used as the female parent, and other parents are used as the male parent for hybridization, and then the high-quality parent combination and the high-quality parent are sequentially carried out. Widely suitable parental combination hybridization, double-cross combination containing high-yield and easy-to-modulate parents, double-cross combination without high-yield and easy-to-modulate parents, and cross-selected plants in the progeny population of compound hybrid combination to construct the basic population of recurrent selection. Then, self-crossing of selected strains within the population, identification of disease resistance and selection of superior strains, hybridization of superior strains of identification and screening of economic and quality traits, and cross-selection of selected strains were carried out to form the selection population for the next round. Each recurrent selection population can introduce heterologous germplasm, and can also extract the required individuals for strain identification. By adopting the method, a plurality of target traits can be simultaneously improved, and the breeding efficiency is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of tobacco breeding, and in particular relates to a recurrent selection group creation and selection method for breeding high-quality multi-resistant tobacco new strains. Background technique [0002] Tobacco is a self-pollinating crop. For a long time, the improvement of tobacco varieties has mainly relied on conventional cross-breeding methods, which are quite effective in achieving near-term breeding goals. However, due to the long-term crossbreeding of a small number of parents and the pedigree selection of offspring, it is difficult to combine multiple major genes that control the same target shape, and it is even more difficult to exert the potential effects of numerous micro-effect gene recombination and accumulation , resulting in the loss of a large number of favorable genes, and the genetic basis of the bred varieties is becoming narrower. For example, the main varieties of flue-cured tobacco in my...

AI Technical Summary

Problems solved by technology

[0005] Since tobacco is a crop with a large plant spacing, and the number of seeds per fruit is large, the breeding targets involve a variety of traits, recurrent selection occupies a large area of ​​land, and the workload is heavy, so there has been no application of recurrent selection to the breeding of new high-quality multi-resistant tobacco varieties. to report

Although there are sporadic literatures that have been discussed in theory, they are all conceptualized and generalized. As for how to create a reincarnation selection group on tobacco, and how to select and deal with the reincarnation selection group, it is still unclear and has not been seen so far. Someone proposed a more practical and operable recurrent selection breeding program in tobacco breeding

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