Stomatal Closure During Tobacco Leaf Desiccation as Affected by Ozone |
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Authors: | A Sõber E Sild |
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Institution: | (1) Tartu Department, Institute of Ecology, Riia 181, 51014 Tartu, Estonia;(2) Institute of Botany and Ecology, University of Tartu, Lai 40, 51014 Tartu, Estonia |
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Abstract: | The effect of acute ozone exposure on the stomatal conductance and leaf water content during rapid desiccation was examined
in leaves of two tobacco cultivars, ozone sensitive cv. BelW3 and ozone tolerant cv. Samsun. The relative rate of stomatal
closure was constant during leaf desiccation in cv. Samsun but decreased in cv. BelW3 in both ozonated and control plants.
Ozone exposure increased the relative rate of stomatal closure and transpiration rate (measured on the following day) in cv.
Samsun, but reduced the respective parameters in cv. BelW3. As a result, the plants of ozone-sensitive cultivar, treated with
ozone, lost more water during desiccation than control plants.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | leaf water content Nicotiana tabacum sensitive and tolerant cultivars stomatal conductance |
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