Fig. 1 in Formation and exudation of biphenyl and dibenzofuran phytoalexins by roots of the apple rootstock M26 grown in apple replant disease soil

Fig. 1. GC-MS chromatogram for detection and quantification of biphenyl and dibenzofuran phytoalexins in roots of the apple rootstock M26. IS, internal standard for relative quantification of biphenyls and dibenzofurans. Numbers above the chemical structures refer to the compound numbers in Table 1. Compounds whose peaks are labeled by stars of the same color have identical molecular masses (labeled below the structures). Their deduced general structures are labeled by stars of the corresponding colors.