Plant Physiol. Illumina
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Plant Physiology 89:165-168 (1989)
© 1989 American Society of Plant Biologists

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Development and Growth Regulation

The Role of Ethylene in the Inhibition of Rooting under Low Oxygen Tensions

Hillel Soffer1, Shimon Mayak2, David W. Burger and Michael S. Reid

Department of Environmental Horticulture, University of California, Davis, California 95616

A 60-fold increase in ethylene content was observed in stem cuttings of chrysanthemum (Chrysanthemum x morifolium Ramat.) held in aero-hydroponics under anoxic conditions during the 8 to 12 days necessary for adventitious root formation. Ethylene, 1-aminocyclopropane-1-carboxylic acid, and 10-(malonylamino) cyclopropane-1-carboxylic acid contents were highest in the immersed portion of the cuttings, but there was substantial ethylene produced by the anoxic, misted portions of the cutting above the liquid. Application of ethylene (10 microliters per liter) to chrysanthemum cuttings stimulated root development in cuttings held in high dissolved oxygen concentrations (8.0 milligrams per liter). Since the application of ethylene did not inhibit rooting in cuttings held at low dissolved oxygen concentrations (2.0 milligrams per liter), the inhibition of rooting under low oxygen concentrations is not mediated by the observed increase in endogenous ethylene content.

1 Visiting Professor, permanent address: Institute of Field and Garden Crops, Agricultural Research Organization, The Volcani Center, Bet Degan 50250, ISRAEL.

2 Visiting Professor, permanent address: Dept. of Ornamental Horticulture, Faculty of Agriculture, The Hebrew University of Jerusalem, Rehovot 76100, ISRAEL.






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