Effects of curing methods on conversion rate of nicotine and TSNAs contents of tobacco Effect of ecological environment on upper stalk leaves quality and neutral aroma components of burley tobacco Effect of Different Altitudes on the Contents of Plastid Pigment and Related Genes Expression of Burley Tobacco Temperature and relative humidity during air-curing and their effects on burley tobacco quality in different curing barns Dynamic change in mineral elements and nicotine content of burley tobacco during plant growth and development Diversity of bacterial community in rhizosphere soils under effects of continuously planting burley tobacco. Construction of  Genetic Linkage Map of Burley Tobacco(Nicotiana tabacum L.) and Genetic Dissection of Partial Traits