Oscillations in stomatal conductance and plant functioning associated with stomatal conductance: Observations and a model
- 1 January 1972
- journal article
- Published by Springer Nature in Planta
- Vol. 106 (3), 185-219
- https://doi.org/10.1007/bf00388098
Abstract
Measurements of transpiration, leaf water content, and flux of water in a cotton plant exhibiting sustained oscillations, in stomatal conductance are presented, and a model of the mechanism causing this behaviour is developed. The dynamic elements, of the model are capacitors—representing the change of water content with water potential in mesophyll, subsidiary and guard cells—interconnected by resistances representing flow paths in the plant. Increase of water potential in guard cells causes an increase in stomatal conductance. Increase of water potential in the subsidiary cells has the opposite effect and provides the positive feed-back which can cause stomatal conductance to oscillate. The oscillations are shown to have many of the characteristics of free-running oscillations in real plants. The behaviour of the model has been examined, using an analogue computer, with constraints and perturbations representing some of those which could be applied to real plants in physiological experiments. Aspects of behaviour which have been simulated are (a) opening and closing of stomata under the influence of changes in illumination, (b) transient responses due to step changes in potential transpiration, root permeability and potential of water surrounding the roots, (c) the influence of these factors on the occurrence and shape of spontaneous oscillations, and (d) modulation of sustained oscillations due to a circadian rhythm in the permeability of roots.Keywords
This publication has 38 references indexed in Scilit:
- Resistances to Water Transport in Soybean, Bean, and Sunflower1Crop Science, 1971
- Stomatal Responses to Pressure Changes and Interruptions in the Water Supply of Detached Leaves of Zea mays L.Plant Physiology, 1970
- Leaf Water Balance During Oscillation of Stomatal AperturePlant Physiology, 1969
- The Diffusive Conductivity of the Stomata of Wheat LeavesJournal of Experimental Botany, 1967
- Dynamic simulation model of the transpiration processWater Resources Research, 1966
- A conceptual model of stomatal control mechanismsWater Resources Research, 1966
- A New Fast Recording Hygrometer for Plant Transpiration MeasurementsPhysiologia Plantarum, 1954
- USE OF THE INFRARED TOTAL ABSORPTION METHOD FOR ESTIMATING THE TIME COURSE OF PHOTOSYNTHESIS AND TRANSPIRATIONCanadian Journal of Research, 1948
- Die abhängigkeit der spaltöffnungsreaktionen von der wasserbilanzPlanta, 1929
- Pulsierende BlattgewebePlanta, 1929