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Publication Type J
Authors Qin, Y., X. Pan, C. Kubicek, I. Druzhinina, K. Chenthamara, J. Labbe and Z. Yuan
Title Diverse Plant-Associated Pleosporalean Fungi from Saline Areas: Ecological Tolerance and Nitrogen-Status Dependent Effects on Plant Growth
Source Frontiers in Microbiology
Abstract Similar to mycorrhizal mutualists, the rhizospheric and endophytic fungi are alsoconsidered to act as active regulators of host fitness (e.g., nutrition and stress tolerance).Despite considerable work in selected model systems, it is generally poorly understoodhow plant-associated fungi are structured in habitats with extreme conditions and towhat extent they contribute to improved plant performance. Here, we investigate thecommunity composition of root and seed-associated fungi from six halophytes growingin saline areas of China, and found that the pleosporalean taxa (Ascomycota) were mostfrequently isolated across samples. A total of twenty-seven representative isolates wereselected for construction of the phylogeny based on the multi-locus data (partial 18SrDNA, 28S rDNA, and transcription elongation factor 1-a), which classified them intoseven families, one clade potentially representing a novel lineage. Fungal isolates weresubjected to growth response assays by imposing temperature, pH, ionic and osmoticconditions. The fungi had a wide pH tolerance, while most isolates showed a variabledegree of sensitivity to increasing concentration of either salt or sorbitol. Subsequentplant-fungal co-culture assays indicated that most isolates had only neutral or evenadverse effects on plant growth in the presence of inorganic nitrogen. Interestingly,when provided with organic nitrogen sources the majority of the isolates enhancedplant growth especially aboveground biomass. Most of the fungi preferred organicnitrogen over its inorganic counterpart, suggesting that these fungi can readily mineralizeorganic nitrogen into inorganic nitrogen. Microscopy revealed that several isolatescan successfully colonize roots and form melanized hyphae and/or microsclerotia-likestructures within cortical cells suggesting a phylogenetic assignment as dark septateendophytes. This work provides a better understanding of the symbiotic relationshipbetween plants and pleosporalean fungi, and initial evidence for the use of this fungalgroup in benefiting plant production.
ISSN 1664-302X
ISBN 1664-302X
Publication Date Feb 6
Year Published 2017
Volume 8
Digital Object Identifier (DOI) 10.3389/fmicb.2017.00158
Unique Article Identifier WOS:000393333900001
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