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Journal of Experimental Botany, Vol. 53, No. 376, pp. 1989-1990, September 1, 2002
© 2002 Oxford University Press

Expression analysis in plant and cell suspensions of CrCKR1, a cDNA encoding a histidine kinase receptor homologue in Catharanthus roseus (L.) G. Don.

Received 24 April 2002; Accepted 4 June 2002

Nicolas Papon, Marc Clastre, Francoise Andreu, Pascal Gantet, Marc Rideau and Joël Crèche2

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

2 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 47 27 66 60. E-mail: creche{at}univ-tours.fr

A full length cDNA (CrCKR1) encoding a hybrid histidine kinase was isolated from a Catharanthus roseus cDNA library. The kinase belongs to the subfamily of cytokinin receptors represented by CRE1/AHK4/WOL in Arabidopsis thaliana. In cell suspensions, the expression of CrCKR1 is not affected by various stress and hormonal treatments but is stimulated in cells continuously exposed to cytokinin. In plants, CrCKR1 is strongly expressed only in the petals of mature flowers. These data suggest that CrCKR1 could take part in the mechanisms leading to the production of secondary metabolites in C. roseus.

Key words: Key words: Catharanthus roseus, cytokinin receptors, histidine kinase.


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