Genetic and pathogenic characterization of <Emphasis Type="Italic">Verticillium dahliae</Emphasis> isolates from eggplant in Turkey |
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| Authors: | Sibel Dervis Halit Yetisir Hatice Y?ld?r?m Fatih M Tok Sener Kurt Fatih Karaca |
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| Institution: | (1) Department of Plant Protection, Faculty of Agriculture, University of Mustafa Kemal, 31034 Antakya, Hatay, Turkey;(2) Department of Horticulture, Faculty of Agriculture, University of Mustafa Kemal, 31034 Antakya, Hatay, Turkey |
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| Abstract: | During 2005 to 2007, eggplant fields in 19 provinces from three different regions (western, southern and southeastern Anatolia
regions) of Turkey were surveyed for Verticillium wilt. Sixty-seven isolates of Verticillium dahliae from wilted eggplants were collected and used for vegetative compatibility analysis using nitrate non-utilizing mutants and
reference tester strains of vegetative compatibility groups (VCGs) 1A, 2A, 2B, 3, 4A and 4B. Among all isolates, 33 (12 from
western, 15 from southern and six from southeastern Anatolia) were assigned to VCG2B, 23 (four from western, eight from southern
and 11 from southeastern Anatolia) to VCG2A, six (four from southern, one from western, and one from southeastern Anatolia)
to VCG4B and five (one from western, one from southern and three from southeastern Anatolia) to VCG1A, whereas VCG3 and VCG4A
were not defined among isolates. In order to test if there is a correlation between VCG and pathogenicity in V. dahliae, pathogenicity of 30 isolates, representing the four multimember VCGs, were tested on Solanum melongena cvs. ‘Kemer’ and ‘Aydın Siyahı’ in an unheated greenhouse. All isolates were found to be pathogenic on both cultivars and
there was no difference in susceptibility between the two cultivars. VCG4B isolates collectively led to higher vascular discoloration
index (VDI) on both cultivars and higher disease severity index (DSI) on ‘Kemer’ compared with other VCGs. Similarly, VCG1A
caused lower VDI on both cultivars and lower DSI on ‘Kemer’. Isolates within each of VCGs 1A, 2A and 4B caused similar VDI
on both cultivars. Isolates of VCG2B were found to vary in their VDI values on both cultivars. To the best of our knowledge,
the present study is the first report of natural infections of eggplant by VCG1A. |
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