Stomatal conductance in Cucumis sativus upon short-term and long-term exposures to low temperatures

Stomatal conductance in Cucumis sativus upon short-term and long-term exposures to low temperatures We studied stomatal conductance (gs) in leaves of cucumber plants (Cucumis sativus L., cv. Zozulya) subjected at early developmental stages to either short-term daily cooling (2 h at the end of night periods) or continuous chilling (12°C throughout the day and night). Irrespective of the irradiance during measurements, continuous chilling either lowered gs or had no effect, as compared to gs of control plants (23°C). In plants subjected to periodic short-term cooling, the gs was found to increase at low temperatures both at moderate and high irradiance; it also increased at high temperature (33°C) but only at photosynthetically active irradiance of 800 μmol/(m2 s). It is supposed that heat-loving plants, subjected to different types of low-temperature treatment, mobilize different mechanisms of stomatal regulation and employ different strategies of adaptation in response to low- and high-temperature treatments. The unusual behavior of stomata, manifested in stomatal opening at both low and high temperatures, extends the adaptive potential of plants subjected daily to short-term low-temperature treatments. This leads to a high level of photosynthesis, biomass accumulation, and supports high physiological activity in plants. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Plant Physiology Springer Journals

Stomatal conductance in Cucumis sativus upon short-term and long-term exposures to low temperatures

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Publisher
SP MAIK Nauka/Interperiodica
Copyright
Copyright © 2012 by Pleiades Publishing, Ltd.
Subject
Life Sciences; Plant Physiology; Plant Sciences
ISSN
1021-4437
eISSN
1608-3407
D.O.I.
10.1134/S102144371205007X
Publisher site
See Article on Publisher Site

Abstract

We studied stomatal conductance (gs) in leaves of cucumber plants (Cucumis sativus L., cv. Zozulya) subjected at early developmental stages to either short-term daily cooling (2 h at the end of night periods) or continuous chilling (12°C throughout the day and night). Irrespective of the irradiance during measurements, continuous chilling either lowered gs or had no effect, as compared to gs of control plants (23°C). In plants subjected to periodic short-term cooling, the gs was found to increase at low temperatures both at moderate and high irradiance; it also increased at high temperature (33°C) but only at photosynthetically active irradiance of 800 μmol/(m2 s). It is supposed that heat-loving plants, subjected to different types of low-temperature treatment, mobilize different mechanisms of stomatal regulation and employ different strategies of adaptation in response to low- and high-temperature treatments. The unusual behavior of stomata, manifested in stomatal opening at both low and high temperatures, extends the adaptive potential of plants subjected daily to short-term low-temperature treatments. This leads to a high level of photosynthesis, biomass accumulation, and supports high physiological activity in plants.

Journal

Russian Journal of Plant PhysiologySpringer Journals

Published: Aug 16, 2012

References

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