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您的检索式：作者名="Derek Persoh"
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| 1 | Can we use environmental DNA as holotypes?显示文摘The advantages and disadvantages of giving a valid name to a sequence of DNA detected from environmental specimens is presently a hot debate amongst the mycological community.The idea of using intracellular DNA('mgDNA')from environmental samples as holotypes seems at face value,to be a good idea,considering the expansion of knowledge among these‘dark taxa’or‘dark matter fungi’that it could provide(i.e.sequence based taxa without physical specimens and formal nomenclature).However,the limitations of using mgDNA as holotypes needs careful thought,i.e.can we use a short mgDNA fragment,which may contain a small amount of genetic information,to allow discrimination between species?What is the point and are the potential problems of giving valid scientific names to mgDNA?Numerous mycologists and taxonomists,who have many years of experience working on the taxonomy and phylogeny of different groups of fungi,are concerned about the consequences of providing valid names to mgDNA.There has been much debate,through several publications on the considerable problems of using mgDNA as holotypes.The proponents have tried to debate the virtues of using mgDNA as holotypes.Those against have shown that identification to species using mgDNA does not work in many fungal groups,while those for have shown cases where species can be identified with mgDNA.Different disciplines have different reasons and opinions for using mgDNA as holotypes,however even groups of the same disciplines have dissimilar ideas.In this paper we explore the use of mgDNA as holotypes.We provide evidences and opinions as to the use of mgDNA as holotypes from our own experiences.In no way do we attempt to degrade the study of DNA from environmental samples and the expansion of knowledge in to the dark taxa,but relate the issues to fungal taxonomy.In fact we show the value of using sequence data from these approaches,in dealing with the discovery of already named taxa,taxa numbers and ecological roles.We discuss the advantages and the pitfalls of using mgDNA from environmental samples as holotypes.The impacts of expanding the nomenclatural concept to allow using mgDNA from environmental samples as holotypes are also discussed.We provide evidence from case studies on Botryosphaeria,Colletotrichum,Penicillium and Xylaria.The case studies show that we cannot use mgDNA due to their short fragments and the fact that most ITS sequence data presently result from environmental sequencing.We conclude from the evidence that it is highly undesirable to use mgDNA as holotypes in naming fungal species.If this approach adopted,it would result in numerous problems where species identification cannot be confirmed due to limited sequence data available for the holotypes.We also propose an alternative DNA-based system for naming DNA based species which would provide considerably less problems and should be adopted. | Sinang Hongsanan Rajesh Jeewon Witoon Purahong Ning Xie Jian-Kui Liu Ruvishika S.Jayawardena Anusha H.Ekanayaka Asha Dissanayake Olivier Raspe Kevin D.Hyde Marc Stadler Derek Persoh | 2018 | Fungal Diversity2018，，5： | 0 |
| 2 | Transient leaf endophytes are the most active fungi in 1-year-old beech leaf litter显示文摘The ecological significance of fungi occurring asymptomatically inside living plant leaves is poorly understood.Given the broad saprotrophic potential of many endophytic fungi,we hypothesized that they persist in decaying litter for an extended period of time after leaf abscission.Fungal assemblages were assessed by highthroughput sequencing in autumn leaves of beech(Fagus sylvatica)and in the corresponding leaf litter in 388 samples from 22 beech forest plots in three widely distant regions of Germany.A considerable proportion of the leafendophytic fungi was also found in 1-year-old litter.Cooccurrence networks revealed that the fungi formed unstructured assemblages inside the living leaves,rather than well-structured communities.Previously endophytic fungi constituted an integral part of the fungal litter community and were by far the most active fungi in 1-year-old litter.We therefore consider these endophytic occurrences to represent transient stages.Composition of the aboveground microbiome appears therefore to be closely connected to the process of litter decomposition.Considering the respective linked fungal habitat will facilitate predicting nutrient and carbon cycling and storage in forest ecosystems as well as elucidating the ecology of leaf microbiomes. | Marco Alexandre Guerreiro Andreas Brachmann Dominik Begerow Derek Persoh | 2018 | Fungal Diversity2018，，2： | 0 |
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