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Plant Physiol, March 2001, Vol. 125, pp. 1442-1449

A Rice Membrane-Bound Calcium-Dependent Protein Kinase Is Activated in Response to Low Temperature1

Mariana Laura Martín and Liliana Busconi2*

Consejo Nacional de Investigaciones Científicas y Tecnológicas, Centro de Investigaciones Biológicas, Fundación para Investigaciones Biológicas Aplicadas, 7600 Mar del Plata, Argentina

Calcium-dependent protein kinases (CDPKs) are found in various subcellular localizations, which suggests that this family of serine/threonine kinases may be involved in multiple signal transduction pathways. CDPKs are believed to be involved in the response of plants to low temperatures, but the precise role in the signal transduction pathway is largely unknown. Previous reports described changes in CDPKs' mRNA levels in response to cold treatment, but whether these changes are accompanied by increases in protein level and/or kinase activities is unknown. In the present study, we identify in rice (Oryza sativa L. cv Don Juan) plants a 56-kD membrane-bound CDPK that is activated in response to cold treatment. Immunoblot analysis of the enzyme preparations from control and cold-treated plants showed that the kinase level was similar in both preparations. However, both kinase and autophosphorylating activities of the enzyme prepared from cold-treated plants were significantly higher than that obtained from control plants. The activation of the CDPK is detected after 12 to 18 h of cold treatment, which indicates that the kinase does not participate in the initial response to low temperature but in the adaptative process to adverse conditions. To our knowledge, this is the first demonstration of a CDPK that is posttranscriptionally activated in response to low temperature.

1  L.B. is a Career Investigator of Consejo Nacional de Investigaciones Científicas y Technológicas (CONICET) and the recipient of a grant from Fundación Antorchas. M.L.M. is a recipient of a Research Fellowship from CONICET.

2 Present address: 50 Walnut Hill Road, Brookline, MA 02445.

* Corresponding author; e-mail lbusconi{at}hotmail.com; fax 54-223-493-8054.

© 2001 American Society of Plant Physiologists


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