Abstract
Many polyacetylenes are toxic to living organisms in the presence of UV-A radiation. These effects have led to speculation about the putative functions of polyacetylenes in the organisms which produce them. Nineteen species of phylloplane yeasts and yeast-like fungi were isolated from species of Hawaiian Bidens with and without leaf acetylenes, and from other Hawaiian plants. Although all these organisms, members of the Sporobolomycetaceae, Cryptococcaceae and Fungi Imperfecti, were photosensitive to some polyacetylenes and resistant to others, there was no correlation between the presence or absence of leaf polyacetylenes and the distribution of these saphrophytes among species of Bidens. Nevertheless, it is significant that the only pathogenic species isolated in this study, Colletotrichum gloeosporiodes (Penzig) Penzig et Sacc., did not colonize Bidens leaves containing C 13 aromatic acetylenes to which it is extremely sensitive in vitro.
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