Virulence not linked with vegetative compatibility groups in Australian cotton Verticillium dahliae isolates

Dadd-Daigle, P; Kirkby, K; Collins, D; Cuddy, W; Lonergan, P; Roser, S; Bhattacharya, P; Labbate, M; Chapman, T

Virulence not linked with vegetative compatibility groups in Australian cotton Verticillium dahliae isolates

Dadd-Daigle, P Kirkby, K Collins, D Cuddy, W Lonergan, P Roser, S Bhattacharya, P

Labbate, M Chapman, T

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Publication Type:: Journal Article
Citation:: Australian Joural of Crop Science, 2020, 14, (04), pp. 633-640
Issue Date:: 2020-05-12

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Field	Value	Language
dc.contributor.author	Dadd-Daigle, P
dc.contributor.author	Kirkby, K
dc.contributor.author	Collins, D
dc.contributor.author	Cuddy, W
dc.contributor.author	Lonergan, P
dc.contributor.author	Roser, S
dc.contributor.author	Bhattacharya, P https://orcid.org/0000-0003-4352-603X
dc.contributor.author	Labbate, M
dc.contributor.author	Chapman, T
dc.date.accessioned	2020-05-12T02:11:59Z
dc.date.available	2020-05-12T02:11:59Z
dc.date.issued	2020-05-12
dc.identifier.citation	Australian Joural of Crop Science, 2020, 14, (04), pp. 633-640
dc.identifier.issn	1835-2707
dc.identifier.uri	http://hdl.handle.net/10453/140658
dc.description.abstract	Verticillium dahliae, the causal agent of Verticillium wilt, is a soil-borne ascomycete that infects numerous agriculturally important crops globally, including cotton. As a billion-dollar industry, cotton is economically important to Australia and the management of disease such as Verticillium wilt is key for the success of the industry. Internationally, defoliating V. dahliae isolates belonging to Vegetative Compatibility Group (VCG) 1A cause severe damage to cotton, while non-defoliating VCG2A isolates result in significantly less disease. However, in Australia, VCG2A is causing more severe damage to crops in the field than the defoliating VCG1A. This study aimed to replicate field observations in controlled greenhouse conditions. We examined and compared disease symptoms on a range of Australian commercial cotton varieties when inoculated with different V. dahliae VCGs. Seedlings were root dipped in conidial suspensions and assessed over seven weeks. The final disease score, disease over time and root length were analysed. Plant mortality resulted from both V. dahliae VCG1A and VCG2A isolates across all cotton varieties used, confirming that there are virulent VCG2A isolates present in Australia. To our knowledge, although virulent on other plant hosts, V. dahliae VCG2A has not previously been reported to be highly virulent in cotton. We infer that virulence cannot be defined solely by VCG in Australian V. dahliae isolates causing disease in cotton.
dc.language	en
dc.relation	NSW Department of Primary Industries
dc.relation.ispartof	Australian Joural of Crop Science
dc.relation.isbasedon	10.21475/ajcs.20.14.04.p2208
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	0607 Plant Biology, 0701 Agriculture, Land and Farm Management, 0703 Crop and Pasture Production
dc.title	Virulence not linked with vegetative compatibility groups in Australian cotton Verticillium dahliae isolates
dc.type	Journal Article
utslib.citation.volume	14
utslib.location.activity	Defoliating; Gossypium hirsutum; Non-defoliating; Verticillium; Wilt
utslib.for	0607 Plant Biology
utslib.for	0701 Agriculture, Land and Farm Management
utslib.for	0703 Crop and Pasture Production
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Strength - ithree - Institute of Infection, Immunity and Innovation
pubs.organisational-group	/University of Technology Sydney
utslib.copyright.status	open_access	*
pubs.consider-herdc	false
dc.date.updated	2020-05-12T02:11:57Z
pubs.issue	04
pubs.publication-status	Published
pubs.volume	14
utslib.start-page	633
utslib.citation.issue	04

Abstract:

Verticillium dahliae, the causal agent of Verticillium wilt, is a soil-borne ascomycete that infects numerous agriculturally important crops globally, including cotton. As a billion-dollar industry, cotton is economically important to Australia and the management of disease such as Verticillium wilt is key for the success of the industry. Internationally, defoliating V. dahliae isolates belonging to Vegetative Compatibility Group (VCG) 1A cause severe damage to cotton, while non-defoliating VCG2A isolates result in significantly less disease. However, in Australia, VCG2A is causing more severe damage to crops in the field than the defoliating VCG1A. This study aimed to replicate field observations in controlled greenhouse conditions. We examined and compared disease symptoms on a range of Australian commercial cotton varieties when inoculated with different V. dahliae VCGs. Seedlings were root dipped in conidial suspensions and assessed over seven weeks. The final disease score, disease over time and root length were analysed. Plant mortality resulted from both V. dahliae VCG1A and VCG2A isolates across all cotton varieties used, confirming that there are virulent VCG2A isolates present in Australia. To our knowledge, although virulent on other plant hosts, V. dahliae VCG2A has not previously been reported to be highly virulent in cotton. We infer that virulence cannot be defined solely by VCG in Australian V. dahliae isolates causing disease in cotton.

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http://hdl.handle.net/10453/140658