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PLANT PHYSIOLOGY , Vol 114, Issue 4 1501-1509, Copyright © 1997 by American Society of Plant Biologists
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WHOLE PLANT, ENVIRONMENTAL, AND STRESS PHYSIOLOGY |
Ethylene Sensitivity and Response Sensor Expression in Petioles of Rumex Species at Low O2 and High CO2 Concentrations
LACJ. Voesenek, W. H. Vriezen, MJE. Smekens, FHM. Huitink, G. M. Bogemann and CWPM. Blom
Department of Ecology and Department of Experimental Botany, University of Nijmegen, Toernooiveld 1, 6525 ED Nijmegen, The Netherlands
Rumex palustris, a flooding-tolerant plant, elongates its petioles in
response to complete submergence. This response can be partly mimicked by
enhanced ethylene levels and low O2 concentrations. High levels of CO2 do
not markedly affect petiole elongation in R. palustris. Experiments with
ethylene synthesis and action inhibitors demonstrate that treatment with
low O2 concentrations enhances petiole extension by shifting sensitivity to
ethylene without changing the rate of ethylene production. The expression
level of the R. palustris gene coding for the putative ethylene receptor
(RP-ERS1) is up-regulated by 3% O2 and increases after 20 min of exposure
to a low concentration of O2, thus preceding the first significant increase
in elongation observable after 40 to 50 min. In the flooding-sensitive
species Rumex acetosa, submergence results in a different response pattern:
petiole growth of the submerged plants is the same as for control plants.
Exposure of R. acetosa to enhanced ethylene levels strongly inhibits
petiole growth. This inhibitory effect of ethylene on R. acetosa can be
reduced by both low levels of O2 and/or high concentrations of CO2.
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