Developmental Analysis on Genetic Behavior of Quality Traits of Flue-cured Tobacco (Nicotiana tabacum) in Multiple Environments

Analysis of genetic main effects and genotype x environment interaction effects for total sugar and reducing sugar of flue-cured tobacco were conducted at two locations and diallel cross by using the additive, dominance and additive x additive model. Unconditional and conditional analyses were employed to investigate the developing behavior of quantitative traits and uncover the genetic mechanisms of flue-cured tobacco. Total and reducing sugars were greatly affected by genotype x environment interaction effect rather than genetic main effect, and gene intermittently expressed and exhibited different genetic mode in different growth stages. It was suggested that genetic imporvement for total sugars of flue-cured tobacco could be achieved by selection of pure lines in the period of Gs1118 to Gs1121 in early generations and by selection of heterosis in the period of Gs1112 to Gs1121 in advanced generations under specific environments. (C) 2012 Friends Science Publishers