Abstract
One hundred eleven isolates of Verticillium dahliae were obtained from potato plants in Erzurum province, Turkey. The pathogen was isolated from 7.6% of the stems collected. All isolates were assigned to vegetative compatibility groups (VCGs) using nitrate-nonutilizing ( nit ) mutants. In total, 240 nit mutants were obtained from V. dahliae isolates, and classified as nit 1 (71%) and nit M (29%). Two VCGs were found and identified as VCG 2B (34 isolates) and VCG 4B (77 isolates) by using tester isolates of known VCGs. Pathogenicity of V. dahliae isolates was tested on potato (cv. Marfona) by the root-dip method. Both VCG 2B and VCG 4B isolates showed similar aggressiveness on potato. This is the first study of VCGs of V. dahliae isolates from potato plants in Turkey.
Highlights
Verticillium dahliae Kleb. is a soilborne plant pathogen responsible for severe damage on many crop species including potato (Pegg & Brady 2002)
Isolates of V. dahliae from potato plants Stem samples were collected from potato fields in Erzurum province
The number of potato stems excised from plants onto culture media in the laboratory totaled 1460 during the 3 years, and V. dahliae was isolated from 7.6% of the stems examined
Summary
Verticillium dahliae Kleb. is a soilborne plant pathogen responsible for severe damage on many crop species including potato (Pegg & Brady 2002). Is a soilborne plant pathogen responsible for severe damage on many crop species including potato (Pegg & Brady 2002). Verticillium wilt on potato caused by V. dahliae has been a serious problem in this area recently. On potato, this fungus causes early senescence of plants and a light brown discoloration in Erzurum İlinde Patates Bitkilerinden Elde Edilen Verticillium dahliae İzolatlarının Vejetatif Uyum Grupları ve Patojeniteleri, Dane & Demirci the vascular ring of tubers (Rich 1986), and it can cause a reduction of both yield and quality. Many weed species have been reported as hosts of V. dahliae (Pegg & Brady 2002; Ligoxigakis et al 2002). The pathogen has been isolated from five weed species in potato fields in Erzurum (Demirci & Genc 2009)
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