AOBPreview published online on March 22, 2004
Annals of Botany, doi:10.1093/aob/mch077
© 2004 by Annals of Botany Company
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Submitted on September 1, 2003
Affiliation of the authors:
1 Laboratoire de Physiologie Végétale, Université de Liège, B22 Sart-Tilman, B-4000 Liège, Belgium;
2 Department of Plant Systems Biology, Flanders Interuniversity Institute for Biotechnology (VIB), Ghent University, K. L. Ledeganckstraat 35, B-9000 Gent, Belgium; INRA, UMR Interactions Plantes-Microorganismes et Santé Végétale, 400 Route des Chappes, BP 167, 06 903 Sophia Antipolis Cedex, France;
3 Department of Plant Systems Biology, Flanders Interuniversity Institute for Biotechnology (VIB), Ghent University, K. L. Ledeganckstraat 35, B-9000 Gent, Belgium
* To whom correspondence should be addressed. E-mail: sandra.ormenese{at}ulg.ac.be.
• 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.
Revised on December 1, 2003
Accepted on December 17, 2003
Analysis of the spatial expression pattern of seven Kip Related Proteins (KRPs) in the shoot apex of Arabidopsis thaliana
SANDRA ORMENESE1*,
Key words: Arabidopsis thaliana, cell cycle, cell differentiation, endoreduplication, KRP expression.
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