Differential effects of deuterium oxide on the growth and morphogenesis of Trichoderma viride |
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Authors: | Siegel, Sanford M. Galun, Esra |
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Affiliation: | 1Department of Botany, University of Hawaii Honolulu, Hawaii, U. S. A. 2Department of Plant Genetics, The Weizmann Institute of Science Rehovot, Israel |
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Abstract: | Trichoderma viride can be grown in deuterium oxide (D2O) concentrationsas high as 99.7%. Increasing concentrations of D2O (2590%)progressively extend the lag phase in growth, but do not greatlyaffect the linear growth rate itself. The minimum age and sizeof colony required for photoinduction of the conidiation processis also increased. In 95% D2O, although growth rates are stillrelatively high, both photomorphogenesis and dark conidiationare completely blocked. This block does not appear to involvethe photoprocess itself, but rather post photoinductive processessuch as differentiation of conidiophores. These observations point to an alternative, or at least additional,hypothesis to the one frequently citedthat D2O acts throughstabilizing or "temperature lowering mechanisms. (Received January 6, 1978; ) |
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