Biological Activities of Different Strains of the Genus Ganoderma spp. (Agaricomycetes) from Mexico

Antiproliferative, antioxidant, and antibacterial activities were determined for 14 extracts obtained with a mixture of chloroform-methanol (1:1) from the mycelial cultures of 14 wild strains of the genus Ganoderma collected in the central-south part of Veracruz Province, Mexico. Identification of the strains collected was confirmed based on rDNA internal transcribed spacer phylogenetic analysis. The strains G. tuberculosum (GVL-04 and GVL-21), G. tornatum (GVL-05), and G. weberianum (GVL-17 and GVL-26) manifested activity in at least one of the six cancer cell lines tested (HBL-100 and T-47D [breast], HeLa [cervix], A-549 and SW1573 [lung], and WiDr [colon]), with a minimum concentration necessary to cause 50% growth inhibition of cancer cells (GI50) < 50 μg/mL-1. The strains G. tuberculosum (GVL-21) and G. martinicense (GVL-35) had the best antioxidant activity, with values of 62.5 ± 3.9 and 40 ± 2.0 μM Trolox equivalents/mg according to the 1,1-diphenyl-2-picrihydrazyl assay. In addition, nine extracts demonstrated antibacterial activity against Clavibacter michiganensis in a concentration range of 31.5 to 1000 μg/mL. Although these results were expected due to the bioactive potential of Ganoderma species, the antibacterial activity against C. michiganensis causing tomato canker is highlighted.