Inhibition of ethylene biosynthesis in carnation petals by cytokinin |
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Authors: | Mor Y Spiegelstein H Halevy A H |
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Affiliation: | Department of Ornamental Horticulture, The Hebrew University of Jerusalem, Rehovot 76 100, Israel. |
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Abstract: | 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. |
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