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UPGMA dendrogram illustrating genetic similarity [31] among isolates and species of Trichoderma from potting media, cultivated soils and uncultivated soils based on AFLP fingerprinting analysis: a shows grouping based on species while b shows grouping based on isolates. The signs indicate that the isolates originate from cultivated soil (square sign), uncultivated soil (triangle sign) or potting media (circle sign)
