Heterokaryosis in Fusarium tricinctum and F. sporotrichioides

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Abstract
Heterokaryons were formed in intra- and interspecific crosses between F. sporotrichioides and F. tricinctum auxotrophs. Segregant homokaryons were evaluated for trichothecene toxin production in culture. Results were consistent with nuclear control of toxin synthesis. The sexual compatibility of auxotrophs and 30 additional F. tricinctum sensu Snyder and Hansen strains was tested. Perithecial production was restricted to crosses between Florida [USA] isolates pathogenic to Enlish ivy (Hedera helix). The linkage of several auxotrophic markers was determined by analysis of progeny of certain crosses. No T-2 toxin was produced by sexually compatible F. tricinctium isolates.