Differentiation of Verticillium dahliae populations on the basis of vegetative compatibility and pathogenicity on cotton

Complementary auxotrophic nitrate-nonutilizing (nit) mutants were used to investigate vegetative compatibility within 27 strains of Verticillium dahliae isolated from several hosts originating from Africa, Asia, Europe and the United States. Using about 500 nit mutants generated from these strains,...

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Bibliographic Details
Published in:European journal of plant pathology 1995-01, Vol.101 (1), p.69-79
Main Authors: Daayf, F. (Laboratoire de Phytopathologie Tropicale ORSTOM, Montpellier (France)), Nicole, M, Geiger, J.P
Format: Article
Language:English
Subjects:
AUTOCOMPATIBILIDAD
AUTOCOMPATIBILITE
Biological and medical sciences
Fundamental and applied biological sciences. Psychology
Fungal plant pathogens
GENETICA
GENETICS
GENETIQUE
GOSSYPIUM
Gossypium arboreum
Gossypium barbadense
Gossypium hirsutum
MUTANT
MUTANTES
MUTANTS
PATHOGENICITY
PATHOTYPE
PATHOTYPES
PATOTIPOS
Phytopathology. Animal pests. Plant and forest protection
PODER PATOGENO
POUVOIR PATHOGENE
SELF COMPATIBILITY
Variation, races, biotypes, parasitic specialization, genetics
VERTICILLIUM
Verticillium dahliae
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Summary:Complementary auxotrophic nitrate-nonutilizing (nit) mutants were used to investigate vegetative compatibility within 27 strains of Verticillium dahliae isolated from several hosts originating from Africa, Asia, Europe and the United States. Using about 500 nit mutants generated from these strains, three vegetative compatibility groups, 1, 2, and 4, were identified. Simultaneously, virulence of each strain was assessed on cultivars of Gossypium hirsutum, G. barbadense and G. arboreum, based upon Foliar Alteration Index (FAI) and Browning Index (BI) estimation. The strains in VCG1 were of both the cotton-defoliating pathotype and race 3 (on cotton) but were non pathogenic on tomato; those in VCG2 and VCG4 were of the nondefoliating pathotype and belonged to different races on cotton and on tomato. Hyaline mutants deriving from parental wild-type strain showed differences in pathogenicity but were always assigned to the parental VCG. A relationship was established between VCGs and the taxonomic position of host plants. Data from nit springs indicated that the sub-populations of V. dahliae (VCGs) may not be completely isolated genetically.
ISSN:0929-1873
1573-8469
DOI:10.1007/BF01876095