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Cyclin D control of growth rate in plants

Abstract

The mechanisms by which plants modulate their growth rate in response to environmental and developmental conditions are unknown, but are presumed to involve specialized regions called meristems where cell division is concentrated1,2,3,4,5. The possible role of cell division in influencing meristem activity and overall plant growth rate is controversial, with a prevailing view that cell division is secondary to higher order meristem controls1,2,6,7. Here we show that a reduction in the length of the cell-cycle G1 phase and faster cell cycling occur when the rate of cell division in transgenic tobacco plants is increased by the plant D-type cyclin CycD2 (ref. 8). The plants have normal cell and meristem sizes, but elevated overall growth rates, an increased rate of leaf initiation and accelerated development in all stages from seedling to maturity. We conclude that cell division is a principal determinant of meristem activity and overall growth rate, and propose that modulation of plant growth rate is achieved through regulation of G1.

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Figure 1: Expression, activity and interaction of CycD2;At in tobacco.
Figure 2: Phenotypic characterization of CycD2;At-expressing tobacco plants.
Figure 3: Leaf expansion and initiation in wild-type and CycD2;At-expressing transgenic plants.
Figure 4: Cell-cycle analysis in wild-type and CycD2;At-expressing transgenic meristems.

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Acknowledgements

We thank M. Sekine for permission to cite unpublished data; I. Furner for making possible the glasshouse experiments; R. Day and A. Mills for expert plant care and measurements; A. Inskip for technical support, T. Burgess and the Multi-Imaging Centre for help with scanning electron micrographs; and M. Cornelissen and M. De Block for invaluable discussions. This work was supported in part by the UK Biotechnology and Biological Sciences Research Council.

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Correspondence to James A. H. Murray.

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Cockcroft, C., den Boer, B., Healy, J. et al. Cyclin D control of growth rate in plants. Nature 405, 575–579 (2000). https://doi.org/10.1038/35014621

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