Mycosporine-alanine: A self-inhibitor of germination from the conidial mucilage ofColletotrichum graminicola |
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| Institution: | 1. Xinjiang Production and Construction Corps Key Laboratory of Protection and Utilization of Biological Resources in Tarim Basin/College of Life Science, Tarim University, Alar, 843300, Xinjiang, PR China;2. Engineering Laboratory of Chemical Resources Utilization in South Xinjiang of Xinjiang Production and Construction Corps, Tarim University, Alar, 843300, Xinjiang, PR China;1. Laboratory of Environmental Mycoscience, Graduate School of Agriculture, Kyoto University, Kyoto, 606-8502, Japan;2. Environmental Science Graduate School, The University of Shiga Prefecture, 2500 Hassaka-cho, Hikone City, Shiga, 522-8533, Japan;1. Selcuk University, Faculty of Science, Department of Chemistry, 42075 Konya, Turkey;2. Selcuk University, Faculty of Science, Department of Biochemistry, 42075 Konya, Turkey;3. Selcuk University, Advanced Research Technology and Application Center, 42075 Konya, Turkey;1. Department of Ophthalmology and Vision Sciences, University of Toronto, Toronto, Canada;2. Department of Ophthalmology, College of Medicine, King Saud University, Riyadh, Saudi Arabia;3. Department of Ophthalmology, Azerbaijan Medical University, Baku, Azerbaijan;4. Donald K. Johnson Eye Centre Toronto Western Hospital, University Health Network, 399 Bathurst St., Toronto, ON M5T 2S8, Canada;5. Department of Ophthalmology, St. Michael’s Hospital, 801-61 Queen St E, Toronto, ON M5C 2T2, Canada;6. The John and Liz Tory Eye Centre, Sunnybrook Health Sciences Centre, 2075 Bayview Ave., Room M1-202a, Toronto, ON M4N 3M5, Canada |
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| Abstract: | On soft substrata conidia ofColletotrichum graminicola germinated by the formation of germ tubes, whereas on hard, hydrophobic substrata they germinated by the formation of appressoria. Regardless of the substratum, conidia did not germinate at high conidium concentrations, suggesting the presence of an endogenous self-inhibitor. Bioassays to test for the inhibition of germination demonstrated the presence of a low-molecular-weight self-inhibitor in the mucilage which surrounds conidia as they are produced in acervuli. The inhibitory material exhibited an absorbance maximum of 310 nm, indicating that it is a member of the mycosporine family of compounds. The inhibitor was purified to homogeneity and shown by mass spectrometric analysis to have a molecular mass consistent with the structure corresponding to mycosporine-alanine. |
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