Abscisic acid metabolism in Ceratocystis coerulescens |
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Authors: | Jens Kettner,Karl Dö rfOing |
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Affiliation: | Inst. für Allgemeine Botanik and Botanischer Garten der Univ. Hamburg, Ohnhorststrabe 18, D-2000 Hamburg 52, Federal Republic of Germany. |
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Abstract: | The fungus Ceratocystis coerulescens Bakshi (strain RWD 390) has been shown to produce the plant hormone, abscisic acid (ABA). The production of ABA in defined liquid medium during a culture period of 50 days was measured by gas-liquid chromatography. A considerable accumulation of ABA occurred in the stationary phase. Maximum ABA contents were 3.5 ng ml−1 in culture media and 218 ng (g dry weight)−1 in mycelial extracts. The ABA-metabolizing capability of the fungus was investigated. Dihydrophaseic acid, and phaseic acid, ABA metabolites in higher plants, were not present in cultures of Ceratocystis coerulescens . When [2-14C]-ABA was fed to the fungus, the formation of [2-14C]- 2-trans , 4- trans -ABA and a second metabolite, less polar than ABA, was observed. This suggests a different metabolic pathway of ABA in the fungus. |
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Keywords: | Ascomycetes dihydrophaseic acid phaseic acid sesquiterpenes |
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