Abscisic Acid Signaling Through Cyclic ADP-Ribose in Plants

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Science  19 Dec 1997:
Vol. 278, Issue 5346, pp. 2126-2130
DOI: 10.1126/science.278.5346.2126

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Abscisic acid (ABA) is the primary hormone that mediates plant responses to stresses such as cold, drought, and salinity. Single-cell microinjection experiments in tomato were used to identify possible intermediates involved in ABA signal transduction. Cyclic ADP–ribose (cADPR) was identified as a signaling molecule in the ABA response and was shown to exert its effects by way of calcium. Bioassay experiments showed that the amounts of cADPR in Arabidopsis thalianaplants increased in response to ABA treatment and before ABA-induced gene expression.

  • * Present address: Laboratoire de Physiologie Cellulaire Végétale, Departement de Biologie Moleculaire et Cellulaire, Universite Joseph Fourier et CEA-Grenoble, 17 rue des Martyrs, F-38054 Grenoble Cedex 9, France.

  • To whom correspondence should be addressed. E-mail: chua{at}

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