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Journal of Experimental Botany, Vol. 54, No. 388, pp. 1793-1795, July 1, 2003
© 2003 Oxford University Press

Differential expression of two type-A response regulators in plants and cell cultures of Catharanthus roseus (L.) G. Don*

Received 21 February 2003; Accepted 7 April 2003

Nicolas Papon, Audrey Oudin, Amerin Vansiri, Marc Rideau, Jean-Claude Chénieux and Joël Crèche{dagger},

EA 2106, Biomolécules et Biotechnologies Végétales, Université de Tours, 31 Avenue Monge, F-37200 Tours, France

* The sequences of CrRR2 and CrRR3 were deposited in the GenBank database under the accession numbers AF534889 and AF534890, respectively.
{dagger} Present address and to whom correspondence should be sent: Laboratoire de Biologie moléculaire et Biochimie végétale, UFR des Sciences Pharmaceutiques, 31 Avenue Monge, F-37200 Tours, France. Fax: +33 2 02 47 27 66 60. E-mail: creche{at}univ-tours.fr

Two full-length cDNAs named CrRR2 and CrRR3 have been isolated by PCR from a C. roseus cDNA library. The first one encodes a 154 amino acid putative protein with a high percentage of identity with the Arabidopsis thaliana response regulators ARR16 and ARR17, and is not expressed in C. roseus organs and cell cultures. The second one encodes a 188 amino acid ORF sharing the highest homologies with the A. thaliana ARR8 and ARR9 response regulators. Its expression is root-specific and the transcripts are transiently up-regulated after trans-zeatin treatment in C. roseus suspension cells. CrRR3 protein might be involved in the cytokinin-enhanced alkaloid production in C. roseus cell cultures.

Key words: Catharanthus roseus, cytokinin, response regulators.


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