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Paper Information

Journal:   IRANIAN JOURNAL OF PLANT PATHOLOGY   2006 , Volume 42 , Number 2 (166); Page(s) 323 To 335.
 
Paper: 

GENETIC DIVERSITY AND HOST SPECIFICITY OF VERTICILLIUM DAHLIAE IN IRAN

 
 
Author(s):  ROUZBEH M., BANIHASHEMI Z.A.D.*
 
* DEPARTMENT OF PLANT PROTECTION, COLLEGE OF AGRICULTURE, UNIVERSITY OF SHIRAZ, SHIRAZ, IRAN
 
Abstract: 

Verticillium dahliae is an economically important pathogen causing vascular wilt on more than 160 plant species. Most strains have a wide host range. Forty-five wild isolates of V. dahlia recovered from different woody and herbaceous plants throughout Iran. Genetic diversity of the isolates was assessed through vegetative compatibility groups (VCGs) using nitrate non-utilizing (nit) mutants. Nit mutants were generated using water agar supplemented with 5-7% KClO3. Nit mutants from different isolates were used in all possible combinations. Three VC local groups were identified and designated as VCGA, VCGB and VCGC which correspond to VCG2B (88.8%) and VCG 2A (8.8%) and weakly to VCG2A (2.2%) Most of the isolates were assigned to VCG2B. The results indicated that genetic diversity of V. dahliae is very low and there were no relationship between VCGs and geographicalorig in of the isolates. Host specificity of V. dahliae using 18 isolates was determined on 11 different hosts plant species. Different plants reacted differently to the isolates and were divided into three groups: very sensitive (eggplant, pistachio, cotton and okra), semi-sensitive (sunflower, radish and rapeseed) and low sensitive (pepper, tomato, small radish and cabbage). Each plant species reacted differently to each isolate. Mint was less sensitive to the pathogen (5 isolates) than other plant species tested.

 
Keyword(s): VCG, VERTICILLIUM WILT, PATHOGENICITY, HOST SPECIFICITY
 
References: 
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  Persian Abstract Yearly Visit 88
 
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