Recurrent selection group creation and selection method for breeding new line of high-quality multiresistance tobacco

Abstract

The invention relates to a recurrent selection group creation and selection method for breeding a new line of a high-quality multiresistance tobacco, firstly, a high-quality parent and an eurytopic parent are used as female parents and other parents are used as male parent to hybridize, then a high-quality parent containing combination and an eurytopic parent containing combination are sequentially hybridized, a high-yield easy-modulation parent containing double cross combination and a double cross combination with no high-yield easy-modulation parent are hybridized, strains are chosen in theoffspring group of a composite hybridized combination to intercross, and a recurrent selection base group is constructed. Then strains are chosen in the group sequentially to self-cross, a disease resistant evaluating and screening superior strain and an economic character and quality character evaluating and screening superior strain are hybridized, and then the strains are chosen to intercrossto construct a next recurrent selection group. A heterologous germ plasm can be introduced into each recurrent selection group, and a required individual can also be extracted to identify the strain.By adopting the method, a plurality of target characters are improved at the same time, 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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