Ribosomal DNA Sequence Divergence and Group I Introns within the Leucostoma Species L. cinctum, L. persoonii, and L. parapersoonii sp. nov., Ascomycetes That Cause Cytospora Canker of Fruit Trees

Adams, Gerard C.; Surve-Iyer, Rupa S.; Iezzoni, Amy

doi:10.2307/3761863

Cited by 31 publications

(40 citation statements)

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“…Thus, a systematic account of the genus Cytospora is needed which takes into account morphology and phylogenetic analysis (Adams et al 2002;Fotouhifar et al 2010;Hyde et al 2010). The genus Cytospora has asexual morphs in Valsa, Leucostoma, Valsella, and Valseutypella (Adams et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Cytospora species associated with walnut canker disease in China, with description of a new species C. gigalocus

et al. 2015

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Section: Introductionmentioning

confidence: 99%

Cytospora species associated with walnut canker disease in China, with description of a new species C. gigalocus

et al. 2015

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“…It is pivotal to accurately delimitate pathogen species for the development of effective disease control methods and sustainable management strategies. However, species delimitation is notoriously difficult in Valsa because of the high variability of morphological traits and in many cases the lack of the teleomorph (Adams et al 2002). This is exemplified by a hundred years of debates about the association of pathogens causing Valsa canker on apple in East Asia (see Wang et al 2011 for historical review therein).…”

Section: Introductionmentioning

confidence: 99%

Delimiting cryptic pathogen species causing apple Valsa canker with multilocus data

Wang

Zang

Yin

et al. 2014

Ecology and Evolution

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Fungal diseases are posing tremendous threats to global economy and food safety. Among them, Valsa canker, caused by fungi of Valsa and their Cytospora anamorphs, has been a serious threat to fruit and forest trees and is one of the most destructive diseases of apple in East Asia, particularly. Accurate and robust delimitation of pathogen species is not only essential for the development of effective disease control programs, but also will advance our understanding of the emergence of plant diseases. However, species delimitation is especially difficult in Valsa because of the high variability of morphological traits and in many cases the lack of the teleomorph. In this study, we delimitated species boundary for pathogens causing apple Valsa canker with a multifaceted approach. Based on three independent loci, the internal transcribed spacer (ITS), β-tubulin (Btu), and translation elongation factor-1 alpha (EF1α), we inferred gene trees with both maximum likelihood and Bayesian methods, estimated species tree with Bayesian multispecies coalescent approaches, and validated species tree with Bayesian species delimitation. Through divergence time estimation and ancestral host reconstruction, we tested the possible underlying mechanisms for fungal speciation and host-range change. Our results proved that two varieties of the former morphological species V. mali represented two distinct species, V. mali and V. pyri, which diverged about 5 million years ago, much later than the divergence of their preferred hosts, excluding a scenario of fungi–host co-speciation. The marked different thermal preferences and contrasting pathogenicity in cross-inoculation suggest ecological divergences between the two species. Apple was the most likely ancestral host for both V. mali and V. pyri. Host-range expansion led to the occurrence of V. pyri on both pear and apple. Our results also represent an example in which ITS data might underestimate species diversity.

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“…Members of the Valsaceae cause canker diseases such as Cytospora canker or gummosis of peach and stone fruits caused by Leucostoma persoonii (Nitschke) Höhn. (Hayova and Minter 1998a) and other species of Leucostoma as described by Adams et al (2002). Species of Valsa including V. ambiens, V. ceratosperma (Tode) Maire, V. cypri (Tul.…”

Section: Valsaceaementioning

confidence: 98%

A review of the phylogeny and biology of the Diaporthales

2007

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Ribosomal DNA Sequence Divergence and Group I Introns within the Leucostoma Species L. cinctum, L. persoonii, and L. parapersoonii sp. nov., Ascomycetes That Cause Cytospora Canker of Fruit Trees

Cited by 31 publications

References 47 publications

Cytospora species associated with walnut canker disease in China, with description of a new species C. gigalocus

Cytospora species associated with walnut canker disease in China, with description of a new species C. gigalocus

Delimiting cryptic pathogen species causing apple Valsa canker with multilocus data

A review of the phylogeny and biology of the Diaporthales

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