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. 1983 Mar;71(3):541–546. doi: 10.1104/pp.71.3.541

Inhibition of Ethylene Biosynthesis in Carnation Petals by Cytokinin 1

Yoram Mor 1, Hanna Spiegelstein 1, Abraham H Halevy 1
PMCID: PMC1066074  PMID: 16662863

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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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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