Elevated CO2 stimulates cells to divide in grass meristems: a differential effect in two natural populations of Dactylis glomerata |
| |
Authors: | E A KINSMAN C LEWIS M S DAVIES J E YOUNG D FRANCIS B VILHAR H J OUGHAM |
| |
Institution: | School of Pure and Applied Biology, University of Wales, PO Box 915, Cardiff CF1 3TL, UK;Department of Biology, Biotechnical Faculty, University of Ljubljana, Vecna pot 111, 1000 Ljubljana, Slovenia;Department of Cell Biology, Institute of Grassland and Environmental Research, Plas Gogerddan, Aberystwyth, Ceredigion SY23 3EB, UK |
| |
Abstract: | In this study, we tested the hypothesis that elevated CO2] shortens the cell cycle in meristems of Dactylis glomerata, more in a Portuguese population (38°53′N) than in a Swedish population (63°09′N). In the shoot meristem, the cell cycle shortened to about the same extent (~ 26%) in both populations exposed to the elevated CO2] treatment. In the root meristem, the cell cycle shortened by 17% in the Portuguese and by 8% in the Swedish population. However, the proportion of rapidly cycling cells increased in the Portuguese much more than in the Swedish population in both meristems. In the root meristem, there was a 1.86-fold increase in the Portuguese compared with a 1.31-fold increase in the Swedish. In the shoot meristem, the increases were 1.5–3-fold for the Portuguese and 1.2-fold for the Swedish. The data are consistent in showing that a major response to the elevated CO2] treatment was an increase in the proportion of cells that were cycling and that this was more marked for the Portuguese population. A more general response to the elevated CO2] treatment was a shortening of the cell cycle regardless of population. |
| |
Keywords: | Dactylis glomerata cell cycle elevated carbon dioxide meristems plastochron |
|
|