Pseudophaeocytostroma bambusicola gen. et sp. nov. (Diaporthaceae) from bamboo in Yunnan, P.R. China

JUTAMART MONKAI; RUNGTIWA PHOOKAMSAK; SHENG XU; JIANCHU XU; PETER E. MORTIMER; SAMANTHA C. KARUNARATHNA; NAKARIN SUWANNARACH; SAISAMORN LUMYONG

doi:10.11646/phytotaxa.571.1.3

Issue: Vol. 571 No. 1: 1 November 2022

Type: Article

Published: 2022-11-01

DOI: 10.11646/phytotaxa.571.1.3

Page range: 39-51

Abstract views: 82

PDF downloaded: 2

Pseudophaeocytostroma bambusicola gen. et sp. nov. (Diaporthaceae) from bamboo in Yunnan, P.R. China

JUTAMART MONKAI⁺⁻
RUNGTIWA PHOOKAMSAK⁺⁻
SHENG XU⁺⁻
JIANCHU XU⁺⁻
PETER E. MORTIMER⁺⁻
SAMANTHA C. KARUNARATHNA⁺⁻
NAKARIN SUWANNARACH⁺⁻
SAISAMORN LUMYONG⁺⁻

Research Center of Microbial Diversity and Sustainable Utilization, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand; Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand

Research Center of Microbial Diversity and Sustainable Utilization, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand; Honghe Center for Mountain Futures, Kunming Institute of Botany, Chinese Academy of Sciences, Honghe 654400, P.R. China

Research Center of Microbial Diversity and Sustainable Utilization, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand; Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand; Honghe Center for Mountain Futures, Kunming Institute of Botany, Chinese Academy of Sciences, Honghe 654400, P.R. China

Honghe Center for Mountain Futures, Kunming Institute of Botany, Chinese Academy of Sciences, Honghe 654400, P.R. China; Centre for Mountain Futures (CMF), Kunming Institute of Botany, Kunming 650201, P.R. China; CIFOR-ICRAF China Program, World Agroforestry (ICRAF), Kunming 650201, P.R. China

Centre for Mountain Futures (CMF), Kunming Institute of Botany, Kunming 650201, P.R. China

Center for Yunnan Plateau Biological Resources Protection and Utilization, College of Biological Resource and Food Engineering, Qujing Normal University, Qujing 655011, P.R. China

Research Center of Microbial Diversity and Sustainable Utilization, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand; Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand

Research Center of Microbial Diversity and Sustainable Utilization, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand; Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand; Academy of Science, The Royal Society of Thailand, Bangkok 10300, Thailand

Bambusicolous fungi Coelomycetous asexual morph New genus Sordariomycetes Taxonomy Fungi

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Abstract

Phaeocytostroma species (Diaporthaceae, Diaporthales, Sordariomycetes) are mainly associated with grasses (Poaceae) and are considered important pathogens of maize and sugarcane. In the present study, a phaeocytostroma-like taxon was collected from bamboo culms in Yunnan, China and characterized using morphological and multigene phylogenetic analyses. The fungus was characterized by uni- to bi-locular conidiomata, papillate ostioles, septate, filiform paraphyses and brown, oblong to ellipsoid, aseptate, conidia, with obtuse ends. Phylogenetic analyses inferred from the combined dataset of ITS, LSU, and TEF1-α regions showed that the phaeocytostroma-like taxon constituted an independent lineage clustered with P. sacchari distant from Phaeocytostroma sensu stricto. Hence, the novel genus Pseudophaeocytostroma is introduced to accommodate the new species Ps. bambusicola. Pseudophaeocytostroma bambusicola clustered with P. sacchari strains CBS 275.34, km-1, UMICH-1, 135 in the present phylogenetic analyses. However, these strains are not the ex-type strains of P. sacchari and some of them lack morphological descriptions and remain unpublished. Therefore, we treat these strains as Ps. “sacchari” herein until the type strain of P. sacchari is verified. The pairwise nucleotide comparison of ITS and TEF1-α sequence data and a pairwise homoplasy index test between Ps. bambusicola and Ps. “sacchari” provided further evidence to support Ps. bambusicola as a distinct species. The morphological characteristics and phylogenetic relationship of Ps. bambusicola and other related Phaeocytostroma species are also compared and discussed.

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