VdThit, a Thiamine Transport Protein, Is Required for Pathogenicity of the Vascular Pathogen Verticillium dahliae.
Mol Plant Microbe Interact
; 29(7): 545-59, 2016 Jul.
Article
em En
| MEDLINE
| ID: mdl-27089469
ABSTRACT
Verticillium dahliae causes a serious wilt disease of important crops and is difficult to control. Few plasma-membrane transport proteins for nutrient acquisition have been identified for this fungus, and their involvement in the disease process is unknown. Here, a plasma-membrane protein, the V. dahliae thiamine transporter protein VdThit, was characterized functionally by deletion of the VdThit gene in V. dahliae. Disruption strains were viable, but growth and conidial germination and production were reduced and virulence was impaired. Interestingly, by supplementing exogenous thiamine, growth, conidiation, and virulence of the VdΔThit mutants were partially restored. Stress-tolerance assays showed that the VdΔThit mutant strains were markedly more susceptible to oxidative stress and UV damage. High-pressure liquid chromatography-mass spectrometry (HPLC-MS) and gas chromatography-mass spectrometry (GC-MS) analyses showed low levels of pyruvate metabolism intermediates acetoin and acetyl coenzyme A (acetyl-CoA) in the VdΔThit mutant strains, suggesting that pyruvate metabolism was suppressed. Expression analysis of VdThit confirmed the importance of VdThit in vegetative growth, reproduction, and invasive hyphal growth. Furthermore, a green fluorescent protein (GFP)-labeled VdΔThit mutant (VdΔThit-7-GFP) was suppressed in initial infection and root colonization, as viewed with light microscopy. Together, these results showed that VdThit plays an indispensable role in the pathogenicity of V. dahliae.
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Base de dados:
MEDLINE
Assunto principal:
Doenças das Plantas
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Plantas
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Tiamina
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Proteínas Fúngicas
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Regulação Fúngica da Expressão Gênica
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Verticillium
Idioma:
En
Ano de publicação:
2016
Tipo de documento:
Article