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Gene expression of the ericoid mycorrhizal fungus Oidiodendron maius in the presence of high zinc concentrations

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Abstract

A heavy metal tolerant strain of the ericoid mycorrhizal species Oidiodendron maius, isolated from roots of Vaccinium myrtillus growing in soil heavily contaminated with zinc, was previously shown to tolerate high concentrations of zinc and cadmium ions in the growth medium. We have investigated the genetic basis of this fungal strain tolerance to high zinc concentrations by using an untargeted approach. From a cDNA library constructed by using mRNA from Zn-treated O. maius mycelia, 444 clones were randomly selected and 318 were sequenced. Sequence analysis identified 219 unique clones: 117 showed homology to previously identified genes, 26 matched unknown protein coding regions found in other organisms, and 76 were novel. Variation in the gene expression level after a 20-day treatment with high concentrations of Zn was monitored on 130 unigenes by reverse northern blot hybridisation. Sixteen unigenes were shown to be either up- (9) or down- (7) regulated. The putative function of these genes and their involvement in stress tolerance is discussed.

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Acknowledgements

We thank John Doonan and Patricia Lunness at the John Innes Centre in Norwich, UK, for their help in the construction of the library. We thank Prof. Simone Ottonello and his group at the Department of Molecular Biology and Biochemistry, University of Parma, Italy, for their help in the reverse northern hybridisation. M.V. acknowledges financial support by the University of Torino. The results described are part of the CEBIOVEM (D.M. 193/2003) program. Research was also partly funded by Cassa di Risparmio di Torino (CRT).

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  1. Dipartimento Biologia Vegetale dell’Università di Torino and Istituto per la Protezione delle Piante del CNR, v.le Mattioli 25, 10125 , Torino, Italy

    Marta Vallino, Vanessa Drogo, Simona Abba’ & Silvia Perotto

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  1. Marta Vallino
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  2. Vanessa Drogo
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  3. Simona Abba’
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  4. Silvia Perotto
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Correspondence to Silvia Perotto.

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Vallino, M., Drogo, V., Abba’, S. et al. Gene expression of the ericoid mycorrhizal fungus Oidiodendron maius in the presence of high zinc concentrations. Mycorrhiza 15, 333–344 (2005). https://doi.org/10.1007/s00572-004-0335-0

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