title: Effect of Gamma Radiation on Zinc Tolerance Efficiency of Aspergillus terreus Thorn.
abstract: The present study emphasizes the potential of gamma radiation in enhancing zinc tolerance of Aspergillus terreus. Gamma-exposed A. terreus could tolerate 1.13 times more Zn, reflecting higher growth (in terms of CFU) under Zn stress and enhanced Zn removal efficacies than their unirradiated counterparts. Radiation-induced upregulation of antioxidative system (SOD, CAT, GSH and MT) of A. terreus is responsible for radiation-induced enhancement of Zn tolerance. FTIR spectra reveals the involvement of functional groups in Zn biosorption; SEM study divulges the structural changes due to metal and gamma exposure and SEM-EDX depicts the Zn uptake by A. terreus (both in gamma-exposed and unexposed conditions). This work sheds light toward utilizing low doses of ionizing radiation for making more metal-tolerant fungi and the possible mechanisms adopted by A. terreus for being more metallo-resistant.
authors.affiliation: Department of Environmental Science, University of Kalyani, Kalyani, Nadia, WB, 741235, India. dipuevs@gmail.com.
authors.forename: Dipanwita
authors.initials: D
authors.lastname: Das
authors.affiliation: UGC-DAE, Consortium for Scientific Research, Kolkata Centre, 3/LB-8, Saltlake, Kolkata, 700098, India.
authors.forename: A
authors.initials: A
authors.lastname: Chakraborty
authors.affiliation: Department of Environmental Science, University of Kalyani, Kalyani, Nadia, WB, 741235, India.
authors.forename: S C
authors.initials: SC
authors.lastname: Santra
mesh_terms: D000975:Antioxidants / Q000378:metabolism; D001230:Aspergillus / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism / Q000528:radiation effects*; D015169:Colony Count, Microbial; D004361:Drug Tolerance; D005720:Gamma Rays; D050296:Microbial Viability / Q000187:drug effects; D008855:Microscopy, Electron, Scanning; D013052:Spectrometry, X-Ray Emission; D015032:Zinc / Q000633:toxicity*
chemical_list: D000975:Antioxidants; D015032:Zinc