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New Ceratocystisspecies associatedwith rapid death ofMetrosiderospolymorpha in Hawai`i Irene BarnesArista FourieM. J. Wingfield2018 год

New Ceratocystis species associated with rapid death of Metrosideros polymorpha in Hawai`i
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Аннотация: The native 'ōhi'a lehua (Metrosideros polymorpha) has cultural, biological and ecological significance to Hawai'i, but it is seriously threatened by a disease commonly referred to as rapid 'ōhi'a death (ROD). Preliminary investigations showed that a Ceratocystis species similar to C. fimbriata s.lat. was the cause of the disease. In this study, we used a combination of the phylogenetic, morphological and biological species concepts, as well as pathogenicity tests and microsatellite analyses, to characterise isolates collected from diseased 'ōhi'a trees across Hawai'i Island. Two distinct lineages, representing new species of Ceratocystis, were evident based on multigene phylogenetic analyses. These are described here as C. lukuohia and C. huliohia. Ceratocystis lukuohia forms part of the Latin American clade (LAC) and was most closely associated with isolates from Syngonium and Xanthosoma from the Caribbean and elsewhere, including Hawai'i, and C. platani, which is native to eastern USA. Ceratocystis huliohia resides in the Asian-Australian clade (AAC) and is most closely related to C. uchidae, C. changhui and C. cercfabiensis, which are thought to be native to Asia. Morphology and interfertility tests support the delineation of these two new species and pathogenicity tests show that both species are aggressive pathogens on seedlings of M. polymorpha. Characterisation of isolates using microsatellite markers suggest that both species are clonal and likely represent recently-introduced strains. Intensive research is underway to develop rapid screening protocols for early detection of the pathogens and management strategies in an attempt to prevent the spread of the pathogens to the other islands of Hawai'i, which are currently disease free.
Год издания: 2018
Авторы: Irene Barnes, Arista Fourie, M. J. Wingfield, T. C. Harrington, Douglas McNew, Lionel S. Sugiyama, Blaine Luiz, Wade P. Heller, Lisa M. Keith
Издательство: National Herbarium of the Netherlands
Источник: Persoonia - Molecular Phylogeny and Evolution of Fungi
Ключевые слова: Plant Pathogens and Fungal Diseases, Forest Insect Ecology and Management, Mycorrhizal Fungi and Plant Interactions
Другие ссылки: Persoonia - Molecular Phylogeny and Evolution of Fungi (HTML)
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