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Death of endemic Virgilia oroboides trees in South Africa caused by Diaporthe virgiliae sp. nov

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    0472868 - BÚ 2017 RIV GB eng J - Článek v odborném periodiku
    Machingambi, N. M. - Dreyer, L. L. - Oberlander, Kenneth - Roux, J. - Roets, F.
    Death of endemic Virgilia oroboides trees in South Africa caused by Diaporthe virgiliae sp. nov.
    Plant Pathology. Roč. 64, č. 5 (2015), s. 1149-1156. ISSN 0032-0862. E-ISSN 1365-3059
    Institucionální podpora: RVO:67985939
    Klíčová slova: bark beetle * root pathogen * Geosmithia * Phomopsis * tree death
    Kód oboru RIV: EF - Botanika
    Impakt faktor: 2.383, rok: 2015

    Numerous dead and dying individuals of the Western Cape endemic tree Virgilia oroboides (Fabaceae) were recently observed within a South African national botanical garden. Root-rot fungi and fungi symbiotic with bark beetles (Curculionidae; Scolytinae) from diseased trees were assessed for their respective roles in V. oroboides mortality. Disease progression was also monitored over 1 year. Fungi were isolated from surface sterilized bark and root samples from diseased trees and provisionally identified using data from the internal transcribed spacer regions (ITS1, ITS2), including the 5.8 SrRNA gene (ITS). Pathogenicity of selected fungi towards V. oroboides was tested under field conditions. The pathogenicity of various bark beetle-associated Geosmithia (Hypocreales: Hypocreomycetidae) spp. from V. oroboides were similarly assessed. The only fungus consistently isolated from lesions on the roots and bark of declining V. oroboides, and never from healthy individuals, represented an undescribed Diaporthe (Diaporthales, Diaporthaceae) species that was characterized using molecular (using data from the ITS marker and part of the beta-tubulin gene, TUB), cultural and morphological characters. It is an aggressive pathogen of V. oroboides, newly described here as Diaporthe virgiliae sp. nov. Trees of all ages are susceptible to this pathogen with subsequent bark beetle attack of mature trees only. All Geosmithia spp. from beetles and/or infected trees were nonpathogenic towards V. oroboides. Diaporthe virgiliae caused a severe decline in the health of the monitored V. oroboides population over a period of only 1 year and should be considered as a significant threat to these trees.
    Trvalý link: http://hdl.handle.net/11104/0270091

     
     
Počet záznamů: 1  

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