Fig. 3. A in Bio-genetic analysis of resistance in tomato to early blight disease, Alternaria alternata

Fig. 3. A two-dimensional plot of the Principal Component Analysis (PCA) of ISSR data showing the clustering of 35 tomato genotypes. On PCA plot, three groups are formed and two other genotypes, namely 111 Falat American and Roma, scattered on the plot and do not fall under any of the groups. The distribution of genetic variation within, and among, groups, was detected using the molecular variance analysis (AMOVA) in GenAlEx software. Genetic variation indices, including observed number of alleles (Na) and effective numbers of alleles (Ne), Shannon's information index (I), Nei's gene diversity (H), percent of polymorphic loci (PPL), were estimated using POP-GENE software.