ORIGINAL ARTICLE
Pathogenicity variation and mycelial compatibility groups in Sclerotinia sclerotiorum
 
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1
Department of Biology, University of Baku, Republic of Azerbaijan
2
Plant Diseases Research Department, Iranian Research Institute of Plant Protection, Tehran, #1, Yaman Ave., Chemran Exp. Way, Teheran 19395, Iran
3
Department of Plant Protection, University of Tehran, Iran
CORRESPONDING AUTHOR
Hossein Irani
Department of Biology, University of Baku, Republic of Azerbaijan
Asghar Heydari
Plant Diseases Research Department, Iranian Research Institute of Plant Protection, Tehran, #1, Yaman Ave., Chemran Exp. Way, Teheran 19395, Iran
 
Journal of Plant Protection Research 2011;51(4):329–336
KEYWORDS
TOPICS
ABSTRACT
Population variability of S. sclerotiorum , the causal agent of Sclerotinia stalk rot of sunflower, was determined by mycelial compatibility grouping (MCG) and pathogenicity variation comparison. To study mycelial compatibility grouping and pathogenicity variability, isolates of S. sclerotiorum were collected from sunflower fields in East, West Azerbaijan and Ardebil provinces of Iran. Among 186 isolates tested, 26 MCGs were identified and 46% were represented by single isolates. There were differences among MCGs comparing mycelial growth rate, sclerotial production on PDA and aggressiveness cause disease. Significant differences were detected in number of sclerotia, dry weight of sclerotia, mycelial growth rate and aggressiveness among MCGs (p < 0.001) regardless of their geographic origins. There was generally a poor correlation (r = 0.21, p ≤ 0.05) between sclerotia weight and number of sclerotia produced on PDA and also to the mycelial growth rate at 24 (r = 0.35, p ≤ 0.05) and 48h (r = 0.39, p ≤ 0.05). Our studies in comparison of the detached leaf and cut-stem methods showed that the highest rank correlations (r = 0.78 p ≤ 0.01), while aggressiveness of two inoculation methods (stem and leaf detached) were not correlated to colony diameter growth or the other two factors. Variation in isolates aggressiveness may be important considerations in disease management systems
CONFLICT OF INTEREST
The authors have declared that no conflict of interests exist.
 
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