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Title:1,8-dihydroxy naphthalene (DHN) - melanin confers tolerance to cadmium in isolates of melanised dark septate endophytes
Authors:ID Potisek, Mateja (Author)
ID Likar, Matevž (Author)
ID Vogel-Mikuš, Katarina (Author)
ID Arčon, Iztok (Author)
ID Grdadolnik, Jože (Author)
ID Regvar, Marjana (Author)
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Language:English
Work type:Unknown
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:The contribution of 1,8-dihydroxy naphthalene (DHN) melanin to cadmium (Cd) tolerance in two dark septate endophytes (DSE) of the genus Cadophora with different melanin content was investigated in vitro. The DSE isolate Cad#148 with higher melanin content showed higher tolerance to Cd than the less melanised Cad#149. Melanin synthesis was significantly reduced by Cd in both isolates with uninhibited melanin synthesis, in a dosedependent manner. Inhibition of melanin synthesis by tricyclazole reduced the relative growth of Cad#148 exposed to Cd and did not affect Cad#149. Cd accumulation was not altered by tricyclazole in the two isolates, but it increased catalase and reduced glutathione reductase activity in more melanised Cad#148, indicating higher stress levels. In contrast, in Cad#149 the enzyme activity was less affected by tricyclazole, indicating a more pronounced role of melanin-independent Cd tolerance mechanisms. Cd ligand environment in fungal mycelia was analysed by extended EXAFS (X-ray absorption fine structure). It revealed that Cd was mainly bound to O- and S-ligands, including hydroxyl, carboxyl, phosphate and thiol groups. A similar proportion of S- and Oligands (~35% and ~65%) were found in both isolates with uninhibited melanin synthesis. Among O-ligands two types with Cd-O-C- and Cd-O-P- coordination were identified. Tricyclazole altered Cd-O- ligand environment in both fungal isolates by reducing the proportion of Cd-O-C- and increasing the proportion of Cd-O-P coordination. DHN-melanin, among other tolerance mechanisms, significantly contributes to Cd tolerance in more melanised DSE fungi by immobilising Cd to hydroxyl groups and maintaining the integrity of the fungal cell wall.
Keywords:DSE, melanin, Cd tolerance, inhibitor tricyclazole, antioxidant enzymes, EXAFS
Year of publishing:2021
Number of pages:str. 1-9
Numbering:Vol. 222, 222
PID:20.500.12556/RUNG-6646 New window
COBISS.SI-ID:70067203 New window
UDC:577
ISSN on article:0147-6513
DOI:10.1016/j.ecoenv.2021.112493 New window
NUK URN:URN:SI:UNG:REP:9QTOEXOO
Publication date in RUNG:13.07.2021
Views:2153
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Record is a part of a journal

Title:Ecotoxicology and environmental safety
Shortened title:Ecotoxicol. environ. saf.
Publisher:Academic Press.
ISSN:0147-6513
COBISS.SI-ID:25368320 New window

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