ناصر صباغ نیا

Simple lattice design with two replicates was used to evaluate 25 tobacco genotypes. The following eight traits were measured and evaluated: plant height (PH), leaf length (LL), leaf width (LW), leaf number per plant (LN), stem girth (SG), leaf area (LA), dry leaf yield (DLW), and fresh leaf yield (FLW). The genotype by trait biplot for tobacco dataset explained 73% of the total variation of the standardized data. The polygon view of genotype by trait presented for the eight different traits of tobacco genotypes showed six vertex cultivars (G4, G5, G11, G12, G18, and G21). Genotype G21 had the highest values for most of the measured traits. Based on a vector view biplot, strong positive associations among LL, DLW, FLW, and LA were detected while near zero correlations between LL and SG, as well as between LL and PH were observed. Generally, based on ideal genotype and ideal tester biplots, it was demonstrated that the selection for high leaf yield should be performed via leaf length, leaf width, and leaf area traits identified as effective selection criteria for high yielding cultivars.