Gigantenone,a novel sesquiterpene phytohormone mimic |
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| Authors: | D Kenfield G Bunkers Y -H Wu G Strobel F Sugawara Y Hallock J Clardy |
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| Institution: | (1) Department of Plant Pathology, Montana State University, 59717 Bozeman, Montana, USA;(2) Laboratory of Herbicide and Growth Regulators, Riken Institute of Physical and Chemical Research, 351 Wako-shi, Saitama, Japan;(3) Department of Chemistry, Baker Laboratory, Cornell University, 14853-1301 Ithaca, New York, USA;(4) Present address: the Institute of Botany, Academia Sinica, Beijing, People's Republic of China |
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| Abstract: | Summary Gigantenone, a new eremophilane diepoxide, was isolated from the fungal plant pathogenDrechslera gigantea. It displays unique biological activity on higher plants. On most graminaceous species, the application of 18 nanomoles to a leaf surface results in the formation of  green islands — localized areas of chlorophyll retention. Gigantenone is structurally unrelated to the cytokinins, yet induces the green island effect associated with these phytohormones at comparable concentrations. However, on dicotyledonous species it generally causes necrotic lesions. On host plants ofD. gigantea, gigantenone induced lesions closely resembling those appearing in natural infections. Gigantenone also induces root formation in mung bean hypocotyls and shows a high level of activity in several plant tissue culture systems.We thank the US-National Science Foundation (Grant DMB-8607347) for partially supporting this work. |
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| Keywords: | Phytohormone fungal plant pathogen chlorophyll retention green island effect senescence |
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