Breeding method for multi-resistance flue-cured tobacco hybrid

Abstract

The invention provides a breeding method for a multi-resistance flue-cured tobacco hybrid. The breeding method for the multi-resistance flue-cured tobacco hybrid comprises the steps of firstly using MSG28 as a female parent, using high-quality, widely applicable and blackleg-resistant varieties which are sensitive to TMV and weather fleck and are used for production as recurrent parents, performing eight generations of backcrossing to breed male sterile lines, using fertile materials which are resistant to blackleg and highly resistant to TMV and weather fleck as original resources, performing six generations of selfing purification to breed selfing pure lines with common or better curing characteristics, then using the bred male sterile lines as female parents and the selfing pure lines as male parents to breed hybrid combinations, respectively evaluating resistance to different diseases and economic performance by using land parcels or areas seriously attacked by different diseases and normal land parcels in producing areas, and finally performing 2-3 years of multi-point tests for quality and adaptability evaluation to the hybrid combinations which are simultaneously resistant to different diseases and have good economic performance. By adopting the method, the aggregation of multiple characters such as high quality, simultaneous resistance to foliage diseases and root and stalk diseases and good adaptability can be realized, the breeding efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of tobacco heterosis utilization, and in particular relates to a method for breeding multi-resistant flue-cured tobacco hybrids. Background technique [0002] Flue-cured tobacco is the main raw material crop of cigarettes and an important economic crop in China, and the variety is the basis of flue-cured tobacco production. For a long time, the main varieties used in my country's flue-cured tobacco production have been a few varieties such as Yunyan 87, K326, China Tobacco 100, and China Tobacco 103, resulting in a single planting structure and degradation of comprehensive disease resistance and stress resistance. In recent years, tobacco common mosaic disease (TMV), climatic spot disease and black shank disease have become more and more serious, seriously reducing the yield and quality of tobacco, and causing heavy economic losses. At present, there are very few good varieties resistant to TMV, climatic sp...

AI Technical Summary

Problems solved by technology

The main reason is that the bred hybrids only have an advantage in yield, and cannot resist foliar diseases and root diseases at the same time, and their quality and adaptability are poor.

This is related to the lack of identification conditions for many diseases in most breeding units in my country, which leads to greater blindness in the preparation of F1 generation combinations; Insufficient understanding of the expression law of the first generation of hybrids

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