Genetic Relationships Among Verticillium dahliae Isolates from Cotton in Greece Based on Vegetative Compatibility

Author: Elena K.

Source: European Journal of Plant Pathology, Volume 105, Number 6, September 1999 , pp. 609-616(8)

Publisher: Springer

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Abstract:

Vegetative compatibility groups of a collection of 71 Greek Verticillium dahliae isolates obtained from cotton plants were tested. Nit mutants were generated from single spore wild strains by selecting chlorate-resistant sectors on minimal medium amended with potassium chlorate, 25 g/l. These mutants were tested against tester strains from the USA and Greece of the previously described VCGs 1, 2, 3 and 4. Forty-six of 71 isolates belonged to VCG2, because they were able to anastomose with the testers of this group, two isolates belonged to VCG4 and one to VCG1, while the 22 remaining strains could not be assigned to any of the identified VCGs. Our data demonstrated that wilt of cotton is caused only by V. dahliae in Greece, and VCG2 is the most commonly detected VCG. Some strains were found to be more virulent to cotton than other strains from the same VCG. This is the first report of VCG1 of Verticillium in Greece.

Keywords: chlorate-resistant; complementation; heterokaryon; mutant; vegetative compatibility

Language: English

Document Type: Regular paper

Affiliations: 1: Benaki Phytopathological Institute, 8 S. Delta str., GR 145 61 Kifissia, Athens, Greece

Publication date: 1999-09-01