Effects of Nitrogen Phosphorus Potassium and Water on Lutein in Tobacco (Nicotiana tabacum L.) Leaves Relationship between Main Chemical Components in Leaf and Leaf Length in Different Positions in Tobacco (Nicotiana tabacum L.) Effects of nanocarbon application on nitrogen absorption and utilization of flue-cured tobacco Functional Study of a DREB homologous gene SsDREB from Suaeda salsa L. Genetic Diversity and Evolutionary Analysis of Tobacco (Nicotiana tabacum L.) Germplasm Resources Based on ISSR and SRAP Markers Mapping of Quantitative Trait Loci Underlying Six Agronomic Traits in Flue-Cured Tobacco (Nicotiana tabacum L.) Nitrogen Uptake of Flue-Cured Tobacco in Typical Types of Soil in Southwest China Effects of Different Organic Acids on Quality and Yield in Tobacco (Nicotiana tabacum L.)