Breeding and Characteristics of New Flue-cured Tobacco Variety Guiyan 20
Guiyan 20,a new flue-cured tobacco variety,was developed through systematic breeding of a natural mutant plant of Yunyan 87 with a higher leaf count and was approved by the National Tobacco Variety Appraisal Committee in April 2023.Guiyan 20 has a pyramidal plant shape,long oval leaves,and strong growth potential with a field growth period of 129.3 days.The average topping height is 128.30 cm,with 23.17 harvestable leaves.It shows moderate resistance to black shank,moderate susceptibility to bacterial wilt,root-knot nematodes,brown spot,and TMV,and susceptibility to CMV and PVY.Its resistance to brown spot is better than K326,while resistance to black shank,TMV,CMV,and PVY is comparable to K326.However,its resistance to bacterial wilt and root-knot nematodes is lower than K326,indicating overall resistance inferior to K326.The average yield is 2904.35 kg/hm2 with a value of 74,287.05 yuan/hm2,with main economic traits superior to K326.Its chemical composition is well-coordinated and comparable to K326,but superior to Yunyan 87.The appearance quality of the raw tobacco is better than K326 and slightly inferior or comparable to Yunyan 87,with overall sensory quality superior to both K326 and Yunyan 87.Based on its characteristics,Guiyan 20 is suitable for planting in the southwestern tobacco-growing areas,but it should avoid regions or soils with high incidence of viral diseases(CMV,PVY),root-knot nematodes,and root-stem diseases.Fertilization should be adjusted based on local soil fertility relative to Yunyan 87's requirements.Lower leaf processing is not suitable for 4-5 fresh leaves per plant,with 20-21 leaves retained per plant.Maturity harvesting and curing should refer to Yunyan 87.Guiyan 20 is an excellent new flue-cured tobacco variety that balances yield and quality.
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