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Variability in growth and reproduction of the marine fungus,Lulworthia floridana

Variabilität von Wachstum und Reproduktion bei dem marinen PilzLulworthia floridana

Kurzfassung

Nahrungsphysiologische Untersuchungen an 10 Lulworthien der mittleren Sporenbereichgruppe, welche durchLulworthia floridana Meyers charakterisiert ist, demonstrieren die Variabilität der Isolate hinsichtlich ihres Wachstums und ihrer Reproduktion (Perithecien-Entwicklung) bei Verabreichung verschiedener Kohlenhydratverbindungen. Eintritt und Intensität der Perithecien-Entwicklung werden durch Inkubationstemperaturen von 25° bis 30° C begünstigt. Unterschiedliche Reaktionen der Isolate bezüglich ihrer vegetativen und reproduktiven Entwicklung illustrieren die Heterogenität der Population. Die Untersuchungsergebnisse zeigen, daß zukünftige taxonomische Bearbeitungen der Gattung sowohl morphologische als auch physiologische Eigenarten berücksichtigen müssen. Gegenwärtig istLulworthia reduziert zu einer kompositären Art -L. medusa (Ell. & Ev.) Cribb & Cribb; in der Zukunft erscheint jedoch eine Trennung von Isolaten dieser heterogenen Gruppe auf Grund physiologischer Kriterien möglich.

Summary

1. Dissimilar response in both vegetative and reproductive development of separate isolates of the marine ascomycete,Lulworthia floridana, demonstrate the heterogeneity of this fungal population. Particular differences are noted in the carbohydrate utilization spectra of the various isolates.

2. Striking stimulation of onset and intensity of perithecial development is seen at incubation temperatures of 25° and 30° C. Extrapolation of these experimental observations to field studies of infestation of lignocellulose substrates byLulworthia suggests thatLulworthia isolates from subtropical marine waters are different from those prevalent in northern and arctic marine regions.

3. While the genusLulworthia currently has been reduced to a single composite species, in all likelihood, subsequent breakdown of this heterogeneous group will be along physiological lines.

Literature cited

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Meyers, S.P. Variability in growth and reproduction of the marine fungus,Lulworthia floridana . Helgolander Wiss. Meeresunters 13, 436–443 (1966). https://doi.org/10.1007/BF01611960

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