Diversity, antimicrobial activities and associated microbiota of soil Penicillia from virgin forest floor
2012
Chutia, M., Central Muga Eri Research & Training Institute, Jorhat (India) | Ahmed, G. U., Gauhati University (India). Department of Biotechnology
The diversity of Penicillium spp. and associate mycobiota from different virgin forest floor in the Brahmaputra Valley, Assam, India was analyzed. Soil samples were collected from six different undisturbed forest floors together with seasonally flooded forest and also from agricultural fields. Samples were taken from the litter and from three soil core i.e. 0-5, 10-15 and 30-35 cm in depth. The isolated fungal species were identified based on morphological and reproductive characteristics. About 18 common fungal species from different soil samples were isolated dominated by Penicillium sp. and Aspergillus sp. The total fungal population found in the studied sites was 98.87 ( plus minus 10.7) x 103 CFU per g dry soils in all the seasons in top soils. The total CFUs of Penicillium were also highest among the species in all the sites (mean 18.73 plus minus 1.1x10E+3 CFU per g; n=7) where 27.2 x10E+3 CFU per g in summer and 11.6 x 103 CFU per g dry soil in winter. Relative density of Penicillium sp. was also higher among the associated fungi although relative density of Aspergillus (23.83) was higher than Penicillium (19.39). Among the 30 isolates of Penicillium, few species have shown antimicrobial activity against the tested bacterial pathogens. The cultural filtrate of four different isolates showed antimicrobial activity against Streptococcus bombycis, Aeromonas salmonicida, Staphylococcus aureus and E. coli having inhibition zone of about more or equal 10 mm. All the tested bacterial species were sensitive to six different Penicillium spp.
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