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Elevated CO 2 stimulates cells to divide in grass meristems: a differential effect in two natural populations of Dactylis glomerata
Author(s) -
KINSMAN E. A.,
LEWIS C.,
DAVIES M. S.,
YOUNG J. E.,
FRANCIS D.,
VILHAR B.,
OUGHAM H. J.
Publication year - 1997
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1046/j.1365-3040.1997.d01-21.x
Subject(s) - meristem , dactylis glomerata , biology , population , botany , shoot , portuguese , poaceae , demography , linguistics , philosophy , sociology
In this study, we tested the hypothesis that elevated [CO 2 ] 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 [CO 2 ] 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 [CO 2 ] 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 [CO 2 ] treatment was a shortening of the cell cycle regardless of population.