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Plant Physiology 71:541-546 (1983)
© 1983 American Society of Plant Biologists

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Articles

Inhibition of Ethylene Biosynthesis in Carnation Petals by Cytokinin 1

Yoram Mor, Hanna Spiegelstein and Abraham H. Halevy

Department of Ornamental Horticulture, The Hebrew University of Jerusalem, Rehovot 76 100, Israel

Pretreatment of detached carnation petals (Dianthus caryophyllus cv White Sim) for 24 hours with 0.1 millimolar of the cytokinins N6-benzyl-adenine (BA), kinetin, and zeatin blocked the conversion of externally supplied 1-aminocyclopropane-1-carboxylic acid (ACC) to ethylene and delayed petal senescence by 8 days. The normal enhanced wilting and increase in endogenous levels of ACC and ethylene production following exposure of petals to ethylene (16 µl/l for 10 hours), were not observed in BA-pretreated petals. In carnation foliage leaves pretreated with 0.1 mM BA, a reduction rather than inhibition of the conversion of exogenous ACC to ethylene was observed. This indicates that foliage leaves respond to cytokinins in a different way than petals. A constant 24-hour treatment with BA (0.1 mM) was not able to reduce ethylene production of senescing carnation petals, while 2 mM aminoxyacetic acid, a known inhibitor of ACC synthesis, or 10 mM propyl gallate, a free radical scavenger, decreased ethylene production significantly.

1 Supported by the Pearlstein, Dautoff, and Hollingsworth Fund for Research in Ornamental Horticulture at the Hebrew University.




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H. Chang, M. L. Jones, G. M. Banowetz, and D. G. Clark
Overproduction of Cytokinins in Petunia Flowers Transformed with PSAG12-IPT Delays Corolla Senescence and Decreases Sensitivity to Ethylene
Plant Physiology, August 1, 2003; 132(4): 2174 - 2183.
[Abstract] [Full Text] [PDF]


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Copyright © 1983 by the American Society of Plant Biologists