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Halophytophthora fluviatilis Pathogenicity and Distribution along a Mediterranean-Subalpine Gradient

Halophytophthora species have been traditionally regarded as brackish water oomycetes; however, recent reports in inland freshwater call for a better understanding of their ecology and possible pathogenicity. We studied the distribution of Halophytophthora fluviatilis in 117 forest streams by metaba...

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Autores principales: Caballol, Maria, Štraus, Dora, Macia, Héctor, Ramis, Xavier, Redondo, Miguel Á., Oliva, Jonàs
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7913473/
https://www.ncbi.nlm.nih.gov/pubmed/33546355
http://dx.doi.org/10.3390/jof7020112
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author Caballol, Maria
Štraus, Dora
Macia, Héctor
Ramis, Xavier
Redondo, Miguel Á.
Oliva, Jonàs
author_facet Caballol, Maria
Štraus, Dora
Macia, Héctor
Ramis, Xavier
Redondo, Miguel Á.
Oliva, Jonàs
author_sort Caballol, Maria
collection PubMed
description Halophytophthora species have been traditionally regarded as brackish water oomycetes; however, recent reports in inland freshwater call for a better understanding of their ecology and possible pathogenicity. We studied the distribution of Halophytophthora fluviatilis in 117 forest streams by metabarcoding river filtrates taken in spring and autumn and by direct isolation from floating leaves. Pathogenicity on six Fagaceae species and Alnus glutinosa was assessed by stem inoculations. The distribution of H. fluviatilis was correlated with high mean annual temperatures (>93.5% of reports in Ta > 12.2 °C) and low precipitation records. H. fluviatilis was therefore widely distributed in forest streams in a warm–dry climate, but it was mostly absent in subalpine streams. H. fluviatilis was primarily detected in autumn with few findings in spring (28.4% vs. 2.7% of streams). H. fluviatilis was able to cause small lesions on some tree species such as Quercus pubescens, Q. suber and A. glutinosa. Our findings suggest that H. fluviatilis may be adapted to warm and dry conditions, and that it does not pose a significant threat to the most common Mediterranean broadleaved trees.
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spelling pubmed-79134732021-02-28 Halophytophthora fluviatilis Pathogenicity and Distribution along a Mediterranean-Subalpine Gradient Caballol, Maria Štraus, Dora Macia, Héctor Ramis, Xavier Redondo, Miguel Á. Oliva, Jonàs J Fungi (Basel) Article Halophytophthora species have been traditionally regarded as brackish water oomycetes; however, recent reports in inland freshwater call for a better understanding of their ecology and possible pathogenicity. We studied the distribution of Halophytophthora fluviatilis in 117 forest streams by metabarcoding river filtrates taken in spring and autumn and by direct isolation from floating leaves. Pathogenicity on six Fagaceae species and Alnus glutinosa was assessed by stem inoculations. The distribution of H. fluviatilis was correlated with high mean annual temperatures (>93.5% of reports in Ta > 12.2 °C) and low precipitation records. H. fluviatilis was therefore widely distributed in forest streams in a warm–dry climate, but it was mostly absent in subalpine streams. H. fluviatilis was primarily detected in autumn with few findings in spring (28.4% vs. 2.7% of streams). H. fluviatilis was able to cause small lesions on some tree species such as Quercus pubescens, Q. suber and A. glutinosa. Our findings suggest that H. fluviatilis may be adapted to warm and dry conditions, and that it does not pose a significant threat to the most common Mediterranean broadleaved trees. MDPI 2021-02-03 /pmc/articles/PMC7913473/ /pubmed/33546355 http://dx.doi.org/10.3390/jof7020112 Text en © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Caballol, Maria
Štraus, Dora
Macia, Héctor
Ramis, Xavier
Redondo, Miguel Á.
Oliva, Jonàs
Halophytophthora fluviatilis Pathogenicity and Distribution along a Mediterranean-Subalpine Gradient
title Halophytophthora fluviatilis Pathogenicity and Distribution along a Mediterranean-Subalpine Gradient
title_full Halophytophthora fluviatilis Pathogenicity and Distribution along a Mediterranean-Subalpine Gradient
title_fullStr Halophytophthora fluviatilis Pathogenicity and Distribution along a Mediterranean-Subalpine Gradient
title_full_unstemmed Halophytophthora fluviatilis Pathogenicity and Distribution along a Mediterranean-Subalpine Gradient
title_short Halophytophthora fluviatilis Pathogenicity and Distribution along a Mediterranean-Subalpine Gradient
title_sort halophytophthora fluviatilis pathogenicity and distribution along a mediterranean-subalpine gradient
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7913473/
https://www.ncbi.nlm.nih.gov/pubmed/33546355
http://dx.doi.org/10.3390/jof7020112
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