Author:
Sldhu Gurmel S.,Webster John M.
Abstract
Single-step amino acid auxotrophs were obtained by ultraviolet irradiation of microconidia from races I and 2 of Fusarium oxysporum lycopersici. Intrarace and interrace combinations were made between the mutants to synthesize heterokaryons. After appropriate tests, 13 heterokaryons were selected for analyses of nuclear ratios and virulence. Results indicate that nuclear ratios of intrarace heterokaryons were more balanced than those of interrace heterokaryons. This may be due to incompatibility factors. Tests on four tomato cultivars indicate that heterokaryons rarely show an increase in virulence. There was limited occurrence and low survival of heterokaryons under soil conditions. The findings are discussed in light of the role of heterokaryosis in natural variability and virulence of Fungi Imperfecti.
Publisher
Canadian Science Publishing
Cited by
14 articles.
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