Plant Physiol.
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Plant Physiology 73:395-397 (1983)
© 1983 American Society of Plant Biologists

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Articles

Endogenous Auxin and Ethylene in Pellia (Bryophyta) 1

Robert J. Thomas2, Marcia A. Harrison, Jane Taylor and Peter B. Kaufman

Department of Botany, University of Michigan, Ann Arbor, Michigan 48109, Department of Cellular and Molecular Biology, University of Michigan, Ann Arbor, Michigan 48109, Division of Biological Sciences, University of Michigan, Ann Arbor, Michigan 48109, Department of Biology, University of Michigan, Flint, Michigan 48503

The occurrence of endogenous indole-3-acetic acid and ethylene in bryophyte tissue was tentatively demonstrated using gas chromatography, high performance liquid chromatography, and double-standard isotope dilution techniques. Rapidly elongating stalks (or setae) of Pellia epiphylla (L.) Corda sporophytes contain approximately 2.5 to 2.9 micrograms per gram fresh weight of putative free IAA. Ethylene released by setae increases during growth from 0.027 to 0.035 nanoliter per seta per hour. Application of 5 microliters per liter ethylene inhibits auxin-stimulated elongation growth of this tissue, a result which suggests that both endogenously produced compounds act in tandem as natural growth modulators.

2 Permanent address: Department of Biology, Bates College, Lewiston, Maine 04240. To whom correspondence should be directed.

1 Supported in part by National Aeronautics and Space Administration Grant NAGW-34 to P. B. K and a Research Corporation Grant to R. J. T.






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Copyright © 1983 by the American Society of Plant Biologists