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The responses of stomata and leaf gas exchange to vapour pressure deficits and soil water content : III. In the sclerophyllous woody species Nerium oleander

Title data

Gollan, Thomas ; Turner, Neil C. ; Schulze, Ernst-Detlef:
The responses of stomata and leaf gas exchange to vapour pressure deficits and soil water content : III. In the sclerophyllous woody species Nerium oleander.
In: Oecologia. Vol. 65 (February 1985) Issue 3 . - pp. 356-362.
ISSN 1432-1939
DOI: https://doi.org/10.1007/BF00378909

Official URL: Volltext

Project information

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

The responses of leaf conductance, leaf water potential and rates of transpiration and net photosynthesis at different vapour pressure deficits ranging from 10 to 30 Pa kPa-1 were followed in the sclerophyllous woody shrub Nerium oleander L. as the extractable soil water content decreased. When the vapour pressure deficit around a plant was kept constant at 25 Pa kPa-1 as the soil water content decreased, the leaf conductance and transpiration rate showed a marked closing response to leaf water potential at-1.1 to-1.2 MPa, whereas when the vapour pressure deficit around the plant was kept constant at 10 Pa kPa-1, leaf conductance decreased almost linearly from-0.4 to-1.1 MPa. Increasing the vapour pressure deficit from 10 to 30 Pa kPa-1 in 5 Pa kPa-1 steps, decreased leaf conductance at all exchangeable soil water contents. Changing the leaf water potential in a single leaf by exposing the remainder of the plant to a high rate of transpiration decreased the water potential of that leaf, but did not influence leaf conductance when the soil water content was high. As the soil water content was decreased, leaf conductances and photosynthetic rates were higher at equal levels of water potential when the decrease in potential was caused by short-term increases in transpiration than when the potential was decreased by soil drying.

As the soil dried and the stomata closed, the rate of photosynthesis decreased with a decrease in the internal carbon dioxide partial pressure, but neither the net photosynthetic rate nor the internal CO2 partial pressure were affected by low water potentials resulting from short-term increases in the rate of transpiration. Leaf conductance, transpiration rate and net photosynthetic rate showed no unique relationship to leaf water potential, but in all experiments the leaf gas exchange decreased when about one half of the extractable soil water had been utilized. We conclude that soil water status rather than leaf water status controls leaf gas exchange in N. oleander.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BayCEER13383
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Chair Plant Ecology
Research Institutions > Collaborative Research Centers, Research Unit > SFB 137 Gesetzmäßigkeiten und Strategien des Stoffumsatzes in ökologischen Systemen
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology
Research Institutions
Research Institutions > Collaborative Research Centers, Research Unit
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 580 Plants (Botany)
Date Deposited: 19 May 2015 09:38
Last Modified: 15 Mar 2016 13:42
URI: https://eref.uni-bayreuth.de/id/eprint/13885