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First published online May 2, 2002; 10.1104/pp.002923

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Plant Physiol, June 2002, Vol. 129, pp. 854-864

Variation in Growth Rate between Arabidopsis Ecotypes Is Correlated with Cell Division and A-Type Cyclin-Dependent Kinase Activity1

Gerrit T.S. Beemster, Kristof De Vusser,2 Evelien De Tavernier, Kirsten De Bock, and Dirk Inzé*

Department of Plant Genetics, University of Gent/Flanders Institute of Biotechnology, B-9000 Gent, Belgium

We used a kinematic analysis to investigate the growth processes responsible for variation in primary root growth between 18 ecotypes of Arabidopsis. Root elongation rate differed 4-fold between the slowest (Landsberg erecta, 71 µm h-1) and fastest growing line (Wassilewskija [Ws]; 338 µm h-1). This difference was contributed almost equally by variations in mature cortical cell length (84 µm [Landsberg erecta] to 237 µm [Ws]) and rate of cell production (0.63 cell h-1 [NW108] to 1.83 cell h-1 [Ws]). Cell production, in turn, was determined by variation in cell cycle duration (19 h [Tsu] to 48 h [NW108]) and, to a lesser extent, by differences in the number of dividing cells (32 [Weiningen] to 61 [Ws]). We found no correlation between mature cell size and endoreduplication, refuting the hypothesis that the two are linked. However, there was a strong correlation between cell production rates and the activity of the cyclin-dependent kinase (CDKA). The level of the protein could explain 32% of the variation in CDKA. Therefore, it is likely that regulators of CDKA, such as cyclins and inhibitors, are also involved. These data provide a functional link between cell cycle regulation and whole-plant growth rate as affected by genetic differences.

1 This work was supported by grants from the European Union (no. QLG2-CT-1999-00454 and no. QLK5-CT-2001) and the Interuniversity Poles of Attraction Programme (Belgian State, Prime Minister's Office-Federal Office for Scientific, Technical and Cultural Affairs; no. P5/2).

2 Present address: Department of Molecular Biology, University of Gent/Flanders Institute of Biotechnology, Ledeganckstraat 35, 9000 Gent, Belgium.

* Corresponding author; e-mail inzed{at}gengenp.rug.ac.be; fax 32-9-264-5349.

© 2002 American Society of Plant Physiologists


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