An additional marine fungal lineage in the Diatrypaceae, Xylariales: Pedumispora rhizophorae

Anupong Klaysuban; Jariya Sakayaroj; E.B. Gareth Jones

doi:10.1515/bot-2014-0017

Article

An additional marine fungal lineage in the Diatrypaceae, Xylariales: Pedumispora rhizophorae

Anupong Klaysuban , Jariya Sakayaroj and E.B. Gareth Jones

Published/Copyright: August 15, 2014

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From the journal Botanica Marina Volume 57 Issue 5

Abstract

Pedumispora rhizophorae, a marine ascomycete reported only from mangrove habitats, was referred to the Diaporthales on the basis of morphological characteristics. To clarify the phylogenetic classification of P. rhizophorae, we re-examined the morphological features of a recent collection of this fungus and evaluated its taxonomic position at the molecular level. Phylogenetic analyses revealed that P. rhizophorae is distantly placed from the Diaporthales, and groups in the Diatrypaceae, Xylariales with strong support. Pedumispora rhizophorae shares many features with members of the Diatrypaceae, including its saprobic habit on decaying plant material, ascomata embedded in a pseudostroma, the presence of paraphyses and pigmented ascospores. However, P. rhizophorae differs from other members of the Diatrypaceae in that this species has apically truncate asci without an apical apparatus, which deliquesce at maturity, whereas diatrypaceous species have persistent long-stalked asci with a more or less truncate apex. Within the Diatrypaceae, the ascospores of most species are allantoid in shape and unicellular, whereas P. rhizophorae possesses septate, filiform ascospores with apical cells lacking cytoplasm. Filiform ascospores and deliquescing asci are common in many unitunicate marine ascomycetes and are regarded as an adaptation to aquatic environment.

Keywords: Diatrypaceae; Pedumispora; phylogeny; Xylariales

Corresponding author: Jariya Sakayaroj, Fungal Biodiversity Laboratory, National Center for Genetic Engineering and Biotechnology (BIOTEC), 113 Thailand Science Park, Phahonyothin Road, Khlong Nueng, Khlong Luang, Pathum Thani, 12120, Thailand, e-mail: jariyask@biotec.or.th

Acknowledgments

This work was supported by the TRF/BIOTEC Special Program for Biodiversity Research and Training and Petroleum Authority of Thailand (PTT) research grant BRT R_252121. Thanks go to Dr. Rattaket Choeyklin, Ms. Apilux Loilong and Ms. Sujinda Sommai for fieldwork assistance. We thank Dr. Preuttiporn Supaphon and Dr. Satinee Suetrong for RaxML analysis and photographic plate assistance. E.B. Gareth Jones is supported by the Distinguished Scientist Fellowship Program (DSFP), King Saud University, Saudi Arabia. We are grateful to Prof. Morakot Tanticharoen, Dr. Kanyawim Kirtikara and Dr. Lily Eurwilaichitr for their continued interest and support. We thank the anonymous reviewers and chief editor for their valued comments.

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Received: 2014-3-19

Accepted: 2014-7-22

Published Online: 2014-8-15

Published in Print: 2014-10-1

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Articles in the same Issue

https://doi.org/10.1515/bot-2014-0017

Keywords for this article

Diatrypaceae; Pedumispora; phylogeny; Xylariales