Plant Pathology (1997) 46, 229-238

D. Earnshaw and G.J. Boland (1997)
Mycelial compatibility groups in Sclerotium cepivorum
Plant Pathology 46 (2), 229-238
Abstract: Isolates of Sclerotium cepivorum from the Holland-Bradford Marsh, Ontario, Canada (n = 146) and other locations (n =23) were evaluated for mycelial compatibility in agar culture and by transmitted light microscopy. In compatible interactions, hyphae of paired colonies anastomosed without cell deterioration or death at the point of fusion. In some incompatible interactions, hyphae of paired colonies were initially similar to those of compatible interactions but were later followed by deterioration or death of the fused cells. Incompatible interactions were associated with a red-brown colour that, in mass, produced a dark line at the junction of the two colonies. In other incompatible interactions, hyphae were observed to bypass or repel each other without fusing. Compatible and incompatible reactions were used to define nine mycelial compatibility groups (MCGs) among the isolates examined. Among isolates from Ontario, no incompatibility responses were observed among isolates from individual fields (e.g. no intrafield variability) but two MCGs were found among isolates from different fields (e.g. interfield variability). Among isolates from other regions, seven additional MCGs were detected that consisted of one to eight isolates. Two isolates were variable in reaction and were not assigned to any MCG. Three isolates from Switzerland were compatible with MCG-1 isolates from Ontario; and one isolate from Switzerland, two from England, two from New Zealand, and two from Australia were all intercompatible. The results establish that mycelial compatibility can be used to reflect genetic heterogeneity among isolates of S. cepivorum.
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Database assignments for author(s): Greg J. Boland

Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Stromatinia cepivora		Switzerland
	Stromatinia cepivora		United Kingdom
	Stromatinia cepivora		Canada (east)
	Stromatinia cepivora		New Zealand