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Soils of a Mediterranean hot spot of biodiversity and endemism (Sardinia, Tyrrhenian Islands) are inhabited by pan-European, invasive species of Hypocrea/Trichoderma

Migheli, Quirico and Balmas, Virgilio and Komoñ-Zelazowska, Monika and Scherm, Barbara and Fiori, Stefano and Kopchinskiy, Alexey G. and Kubicek, Christian P. and Druzhinina, Irina S. (2009) Soils of a Mediterranean hot spot of biodiversity and endemism (Sardinia, Tyrrhenian Islands) are inhabited by pan-European, invasive species of Hypocrea/Trichoderma. Environmental Microbiology, Vol. 11 (1), p. 35-46. eISSN 1462-2920. Article.

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DOI: 10.1111/j.1462-2920.2008.01736.x

Abstract

We have used a Mediterranean hot spot of biodiversity (the Island of Sardinia) to investigate the impact of abiotic factors on the distribution of species of the common soil fungus Trichoderma. To this end, we isolated 482 strains of Hypocrea/Trichoderma from 15 soils comprising undisturbed and disturbed environments (forest, shrub lands and undisturbed or extensively grazed grass steppes respectively). Isolates were identified at the species level by the oligonucleotide BarCode for Hypocrea/Trichoderma (Trich OKEY), sequence similarity analysis (TrichoBLAST) and phylogenetic inferences. The majority of the isolates were positively identified as pan-European and/or pan-global Hypocrea/Trichoderma species from sections Trichoderma and Pachybasium, comprising H. lixii/T. harzianum, T. gamsii, T. spirale, T. velutinum, T. hamatum, H. koningii/T. koningii, H. virens/T. virens, T. tomentosum, H. semiorbis, H. viridescens/T. viridescens, H. atroviridis/T. atroviride, T. asperellum, H. koningiopsis/T. koningiopsis and Trichoderma sp. Vd2. Only one isolate represented a new, undescribed species belonging to the Harzianum–Catoptron Clade. Internal transcribed spacer sequence analysis revealed only one potentially endemic internal transcribed spacer 1 allele of T. hamatum. All other species exhibited genotypes that were already found in Eurasia or in other continents. Only few cases of correlation of species occurrence with abiotic factors were recorded. The data suggest a strong reduction of native Hypocrea/ Trichoderma diversity, which was replaced by extensive invasion of species from Eurasia, Africa and the Pacific Basin.

Item Type:Article
ID Code:652
Status:Published
Refereed:Yes
Uncontrolled Keywords:Hypocrea/Trichoderma, Sardinia
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/12 Patologia vegetale
Divisions:001 Università di Sassari > 02 Centri > Centro di eccellenza interdisc. sviluppo ricerca biotecnologica e studio biodiversità della Sardegna e dell'area mediterranea
001 Università di Sassari > 01 Dipartimenti > Protezione delle piante
Publisher:Blackwell / Wiley
eISSN:1462-2920
Copyright Holders:© 2008 The Authors, Journal compilation © 2008 Society for Applied Microbiology and Blackwell Publishing
Publisher Policy:La versione definitiva è disponibile alla pagina www3.interscience.wiley.com/
Deposited On:18 Aug 2009 10:02

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