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Author: search.filters.author.Elgorban, Abdallah M.

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    Taxonomy and phylogeny of endophytic Chaetomium (Chaetomiaceae) associated with mango (Mangifera indica) in Yunnan, China
    (2024-01-01)
    Yang, Er Fu
    ;
    Karunarathna, Samantha C.
    ;
    Elgorban, Abdallah M.
    ;
    Soytong, Kasem
    ;
    Promputtha, Itthayakorn
    Endophytic fungi reside within plant tissues throughout their entire or partial life cycle, establishing a mutually beneficial symbiotic relationship with their host plant, free from causing any adverse effects or diseases. In addition, endophytic fungi are known as a rich source of new and physiologically active natural chemicals with great therapeutic potentials. Endophytic fungi can promote their host's growth and improve tolerance towards biotic and abiotic stresses. The endophytic fungi associated with mangoes have been infrequently studied, and most isolates lack both morphological characteristics and phylogenetic analyses. When investigating fungal endophytes associated with mango, we isolated four species of Chaetomium from fresh mango leaves, which were collected from mango trees under commercial cultivation in Honghe Prefecture, Yunnan Province, China. Based on morphological comparisons and the results of phylogenetic analyses of concatenated LSU, ITS, rpb2, and tub2 sequence data, here we introduce a new species: Chaetomium hongheensis (KUNCC22-10764, 22-10750); and two new host records: C. cochliodes (KUNCC22-10741) and C. globosum (KUNCC22-10752) from mango leaves. The two new host records were frequently reported on various substrates in China previously. In addition, the new host and country record Chaetomium unguicola (KUNCC22-10758) is first reported in this study as a mango endophyte in China.
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    Hidden diversity of Pestalotiopsis and Neopestalotiopsis (Amphisphaeriales, Sporocadaceae) species allied with the stromata of entomopathogenic fungi in Taiwan
    (2024-01-01)
    Hsu, Sheng Yu
    ;
    Xu, Yuan Cheng
    ;
    Lin, Yu Chen
    ;
    Chuang, Wei Yu
    ;
    Lin, Shiou Ruei
    Pestalotiopsis sensu lato, commonly referred to as pestalotiopsis-like fungi, exhibit a broad distribution and are frequently found as endophytes, saprobes and pathogens across various plant hosts. The taxa within pestalotiopsis-like fungi are classified into three genera viz. Pestalotiopsis, Pseudopestalotiopsis and Neopestalotiopsis, based on the conidial colour of their median cells and multi-locus molecular phylogenies. In the course of a biodiversity investigation focusing on pestalotiopsis-like fungi, a total of 12 fungal strains were identified. These strains were found to be associated with stromata of Beauveria, Ophiocordyceps and Tolypocladium in various regions of Taiwan from 2018 to 2021. These strains were evaluated morphologically and multi-locus phylogenetic analyses of the ITS (internal transcribed spacer), tef1-α (translation elongation factor 1-α) and tub2 (beta-tubulin) gene regions were conducted for genotyping. The results revealed seven well-classified taxa and one tentative clade in Pestalotiopsis and Neopestalotiopsis. One novel species, Pestalotiopsis manyueyuanani and four new records, N. camelliae-oleiferae, N. haikouensis, P. chamaeropis and P. hispanica, were reported for the first time in Taiwan. In addition, P. formosana and an unclassified strain of Neopestalotiopsis were identified, based on similarities of phylogeny and morphology. However, the data obtained in the present study suggest that the currently recommended loci for species delimitation of pestalotiopsis-like fungi do not deliver reliable or adequate resolution of tree topologies. The in-vitro mycelial growth rates of selected strains from these taxa had an optimum temperature of 25 °C, but growth ceased at 5 °C and 35 °C, while all the strains grew faster under alkaline than acidic or neutral pH conditions. This study provides the first assessment of pestalotiopsis-like fungi, associated with entomopathogenic taxa.