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