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AOBPreview originally published online on March 22, 2004
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Annals of Botany 93: 575-580, 2004
© 2004 Annals of Botany Company

Analysis of the Spatial Expression Pattern of Seven Kip Related Proteins (KRPs) in the Shoot Apex of Arabidopsis thaliana

SANDRA ORMENESE*,1, JANICE DE ALMEIDA ENGLER3,2, RUTH DE GROODT2, LIEVEN DE VEYLDER2, DIRK INZÉ2 and ANNIE JACQMARD1

1 Laboratoire de Physiologie Végétale, Université de Liège, B22 Sart-Tilman, B-4000 Liège, Belgium, and 2 Department of Plant Systems Biology, Flanders Interuniversity Institute for Biotechnology (VIB), Ghent University, K. L. Ledeganckstraat 35, B-9000 Gent, Belgium

3Present address: INRA, UMR Interactions Plantes-Microorganismes et Santé Végétale, 400 Route des Chappes, BP 167, 06 903 Sophia Antipolis Cedex, France. * For correspondence. Fax +32 4366 3831, E-mail sandra.ormenese{at}ulg.ac.be. S. Ormenese and J. de Almeida Engler contributed equally to this work.

Received: 1 September 2003; Returned for revision: 1 December 2003; Accepted: 17 December 2003 Published electronically: 22 March 2004

• Background and aims Kip-related-proteins (KRPs), negative regulators of cell division, have recently been discovered in plants but their in planta function is as yet unclear. In this study the spatial expression of all seven KRP genes in shoot apices of Arabidopsis thaliana were compared.

• Methods In situ hybridization analyses were performed on longitudinal sections of shoot apices from 2-month-old Arabidopsis plants.

• Key Results The study provides evidence for different expression pattern groups. KRP1 and KRP2 expression is restricted to the endoreduplicating tissues. In contrast, KRP4 and KRP5 expression is mainly restricted to mitotically dividing cells. KRP3, KRP6 and KRP7 can be found in both mitotically dividing and endoreduplicating cells.

• Conclusion The results suggest differential roles for the distinct KRPs. KRP1 and KRP2 might specifically be involved in the establishment of polyploidy. In contrast, KRP4 and KRP5 might be involved in regulating the progression through the mitotic cell cycle. KRP3, KRP6 and KRP7 might have a function in both types of cell cycle.

Key words: Arabidopsis thaliana, cell cycle, cell differentiation, endoreduplication, KRP expression.


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