Abstract
Psychrophilic microorganisms are cold-adapted organisms that have an optimum growth temperature below 15 °C, and often below 5 °C. Endophytic microorganisms live inside healthy plants and biosynthesize an array of secondary metabolites which confer major ecological benefits to their host. We provide information, for the first time, on an endophytic association between bioactive psychrophilic fungi and trees in Cupressaceae plant family living in temperate to cold, semi-arid habitats. We have recovered psychrophilic endophytic fungi (PEF) from healthy foliar tissues of Cupressus arizonica, Cupressus sempervirens and Thuja orientalis (Cupressaceae, Coniferales). In total, 23 such fungi were found out of 110 endophytic fungal isolates. They were identified as ascomycetous fungi, more specifically Phoma herbarum, Phoma sp. and Dothideomycetes spp., all from Dothideomycetes. The optimal growth temperature for all these 23 fungal isolates was 4 °C, and the PEF isolates were able to biosynthesize secondary metabolite at this temperature. Extracted metabolites from PEF showed significant antiproliferative/cytotoxic, antifungal and antibacterial effects against phytopathogenic fungi and bacteria. Of special interest was their antibacterial activity against the ice-nucleation active bacterium Pseudomonas syringae. Accordingly, we suggest that evergreen Cupressaceae plants may benefit from their psychrophilic endophytic fungi during cold stress. Whether such endosymbionts confer any ecological and evolutionary benefits to their host plants remains to be investigated in vivo.
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Acknowledgments
We appreciate generous gift of target fungi and bacteria by Jafar Abdollahzadeh (Kurdistan University, Sanandaj, Iran), Salar Jamali (Guilan University, Rasht, Iran) and Abolghasem Ghasemi (Plant Protection Institute, Tehran, Iran). We also thank Javad Hamzei, Freydoun Babalhavaeji, Soheila Mirzaei, Sonbol Nazeri, Dustmorad Zafari and Mohammad-Javad Soleimani Pari at Bu-Ali Sina University of Hamedan, Iran, for their helpful discussions and for sharing laboratory facilities. This work was financially supported by BABiNT, and a grant from BASU to J.S. Jalal Soltani dedicates this work to Mohammad Reza Soltani and Javad Soltani.
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Mahdieh S. Hosseyni Moghaddam and Jalal Soltani contributed equally to this work.
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Hosseyni Moghaddam, M.S., Soltani, J. Psychrophilic endophytic fungi with biological activity inhabit Cupressaceae plant family. Symbiosis 63, 79–86 (2014). https://doi.org/10.1007/s13199-014-0290-2
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DOI: https://doi.org/10.1007/s13199-014-0290-2