Vegetative compatibility and pathogenicity of<Emphasis Type="Italic">Verticillium dahliae</Emphasis> isolates from the aegean region of Turkey |
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Authors: | Mehmet Erhan Göre |
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Institution: | (1) Plant Protection Research Institute, 35040 Bornova, Izmir, Turkey |
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Abstract: | A total of 101Verticillium dahliae isolates were recovered from cotton plants at 57 sites in the Aegean region of Turkey between 2003 and 2004. Isolates were
tested for vegetative compatibility by observing heterokaryon formation among complementary nitrate-nonutilizing (nit) mutants. Forty-six isolates were assigned to VCG 1, 12 to VCG 2A, 33 to VCG 2B and four to VCG 4B. The remaining six isolates
could not be tested for vegetative compatibility because of their inability to yieldnit mutants. All isolates recovered were tested for pathogenicity on cotton cultivars Acala SJ-1 and Deltapine 15-21 by the stem-injection
method. The isolates of VCG 2 and 4B, irrespective of their origin, induced weak to severe symptoms on cotton and were similar
to the previously described cotton non-defoliating pathotype. In contrast, all cotton isolates of VCG1 caused severe foliar
symptoms, stunting, defoliation and often death. This is the first report on VCG 1 ofV. dahliae in Turkey.
http://www.phytoparasitica.org posting May 4, 2007. |
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Keywords: | Cotton Gossypium hirsutum defoliating pathogenicity pathotypes vegetative compatibility Verticillium dahliae |
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