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Plant Physiology 47:7-9 (1971)
© 1971 American Society of Plant Biologists

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Articles

Abscission: The Phytogerontological Effects of Ethylene

F. B. Abeles1, L. E. Craker2 and G. R. Leather

a Plant Sciences Laboratories, Fort Detrick, Frederick, Maryland 21701

The role of ethylene in the aging of bean (Phaseolus vulgaris L. cv. Red Kidney) petiole abscission zone explants was examined. The data indicate that ethylene does accelerate aging in addition to inducing changes in break strength. Application of ethylene during the aging stage (stage 1) promoted abscission when followed by a second ethylene treatment during the cell separating stage (stage 2). The half-maximal effective concentration of ethylene to induce aging was around 0.3 microliter per liter; 10 microliters per liter was a saturating dose. CO2 reversal of ethylene action during stage 1 was incomplete and gave ambiguous results. CO2 (10%) reversed the effect of 10 microliters per liter ethylene but not 1 microliter per liter ethylene. The possibility that ethylene not only accelerated aging but was also a requirement for it was tested, and experimental evidence in favor of this idea was obtained. It was concluded that ethylene plays a dual role in the abscission of bean petiole explants: a phytogerontological effect and a cellulase-inducing effect.

1 Present address: Plant Air Pollution Laboratory, Agricultural Research Service, United States Department of Agriculture, Range 4, Beltsville, Maryland 20705.

2 Present address: Department of Environmental Science, University of Massachusetts, Waltham, Massachusetts 02154.






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Copyright © 1971 by the American Society of Plant Biologists