Recent progress in understanding relationships betweenVerticillium species and subspecific groups

Rowe, R. C.

doi:10.1007/bf02980394

Cited by 67 publications

(58 citation statements)

References 17 publications

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“…Recently Inderbitzin et al (2011a) used fourmarker phylogenetic analysis to identify ten Verticillium species. Earlier studies identified Verticillium species primarily on the basis of morphology and sub-specific groups by virulence and aggressiveness on various hosts (Rowe 1995). Variation in conidial morphology of Verticillium species is minor and thus cannot be used to separate species (Rowe 1995).…”

Section: Species Identification and Numbersmentioning

confidence: 99%

“…Earlier studies identified Verticillium species primarily on the basis of morphology and sub-specific groups by virulence and aggressiveness on various hosts (Rowe 1995). Variation in conidial morphology of Verticillium species is minor and thus cannot be used to separate species (Rowe 1995). Resting structure morphology has been the major morphological character used to differentiate species of Verticillium.…”

Section: Species Identification and Numbersmentioning

confidence: 99%

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One stop shop: backbones trees for important phytopathogenic genera: I (2014)

et al. 2014

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Many fungi are pathogenic on plants and cause significant damage in agriculture and forestry. They are also part of the natural ecosystem and may play a role in regulating plant numbers/density. Morphological identification and analysis of plant pathogenic fungi, while important, is often hampered by the scarcity of discriminatory taxonomic characters and the endophytic or inconspicuous nature of these fungi. Molecular (DNA sequence) data for plant pathogenic fungi have emerged as key information for diagnostic and classification studies, although hampered in part by non-standard laboratory practices and analytical methods. To facilitate current and future research, this study provides phylogenetic synopses for 25 groups of plant pathogenic fungi in the Ascomycota, Basidiomycota, Mucormycotina (Fungi), and Oomycota, using recent molecular data, up-to-date names, and the latest taxonomic insights. Lineagespecific laboratory protocols together with advice on their application, as well as general observations, are also provided. We hope to maintain updated backbone trees of these fungal lineages over time and to publish them jointly as new data emerge. Researchers of plant pathogenic fungi not covered by the present study are invited to join this future effort. Bipolaris, Botryosphaeriaceae,

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Section: Species Identification and Numbersmentioning

confidence: 99%

Section: Species Identification and Numbersmentioning

confidence: 99%

One stop shop: backbones trees for important phytopathogenic genera: I (2014)

et al. 2014

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“…The taxonomy of the group is still being reviewed and many species have a difficult and controversial characterization (Evans & Samson, 1986 ;Rowe, 1995). T o date, species of Verticillium have been characterized primarily on the basis of morphology and by virulence on certain hosts.…”

Section: Introductionmentioning

confidence: 99%

“…The wide host range with little host specificity distinguishes Verticillium fungi from many other plant pathogens. As a result, few physiological races of these plant pathogens have been found and characterized (Rowe, 1995).…”

Section: Introductionmentioning

confidence: 99%

Nuclear rDNA phylogeny in the fungal genus Verticillium and its relationship to insect and plant virulence, extracellular proteases and carbohydrases

et al. 1999

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Phylogenetic relationships among 18 isolates in the genus Verticillium, representing 13 species of diverse econutritional groups (pathogens of insects, plants, mushrooms, nematodes and spiders, and saprobes), were examined by using sequences from the internal transcribed spacer (ITS) and small nuclear (NS) rRNA regions. The isolates were also assessed for their abilities to infect insect larvae (Galleria mellonella) and to cause necrosis in alfalfa (Medicago sativa), and for their proteolytic, chitinolytic and pectinolytic activities. The phylogenetic data suggested that Verticillium is polyphyletic in origin and is therefore a form genus. However, the phylogenetic tree supported the plant pathogens (V. dahliae, V. albo-atrum and V. nigrescens) as a clade. The alfalfa isolate of V. albo-atrum (isolate 595) was an interesting outlier to the main body of plant pathogens as it clustered with the insect pathogen V. indicum. Strains of V. lecanii and V. indicum were able to infect insects and are present in divergent groups in the consensus tree, suggesting that the ability to infect insects may have evolved independently many times. Similarly, the nematophagous Verticillium species appear to have evolved independently along several different routes and one isolate, V. chlamydosporium, was able to infect insects. V. albo-atrum, V. nigrescens and V. dahliae all produced high levels of enzymes capable of degrading pectin, a major component of plant cell walls. The ability to excrete pectinase was a broad indicator of the ability to produce lesions on alfalfa. In the plant pathogens, the functions of a broad-spectrum protease were assumed by trypsins which degrade Bz-AA-AA-Arg-NA substrates (Bz, benzoyl; AA, various amino acids; NA, p-nitroanilide). The insect pathogens and mushroom pathogen (V. fungicola) were characterized by production of high levels of subtilisin-like proteases active against a chymotrypsin substrate (succinyl-Ala,-Pro-Phe-NA) and the inability to clear pectin. The insect and mushroom pathogens, and several nematode pathogens, were distinguishable from the plant pathogens in their ability to produce chitinases.

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“…Israeli nit testers of VCG2A, VCG2B, and VCG4B w e r e pr e v i o u s l y s h o w n to c o r r e l a t e w i t h t h e international OARDC reference strains (Korolev et al 2000;Korolev et al 2008;Rowe 1995). The cotton defoliating strain T9 (the original defoliating pathotype from cotton in California) belongs to subgroup VCG1A (Bell 1994).…”

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confidence: 99%

First report of the presence of Verticillium dahliae VCG1A in Australia

Chapman

Chambers

Kirkby

et al. 2016

Australasian Plant Dis. Notes

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For 32 years, cotton grown in NSW has been monitored for Verticillium wilt, with isolates of Verticillium dahliae Kleb. stored in the NSW Department of Primary Industries culture collection. An increase in disease severity in the 2013/14 season suggests a more virulent pathogenic strain may have been introduced. Eight V. dahliae isolates were selected for vegetative compatibility group (VCG) analysis using molecular assays and nit mutant testing. Two of the eight isolates were identified as the highly virulent defoliating VCG1A, making this the first record of VCG1A in Australia.

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Recent progress in understanding relationships betweenVerticillium species and subspecific groups

Cited by 67 publications

References 17 publications

One stop shop: backbones trees for important phytopathogenic genera: I (2014)

One stop shop: backbones trees for important phytopathogenic genera: I (2014)

Nuclear rDNA phylogeny in the fungal genus Verticillium and its relationship to insect and plant virulence, extracellular proteases and carbohydrases

First report of the presence of Verticillium dahliae VCG1A in Australia

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