Ethylene is involved in high air humidity promoted stomatal opening of tomato (Lycopersicon esculentum) leaves
Louise E. Arve A and Sissel Torre A B
+ Author Affiliations
- Author Affiliations
A Norwegian University of Life Sciences, Department of Plant Sciences, PO Box 5003, 1432 Ås, Norway.
B Corresponding author. Email: sissel.torre@nmbu.no
Functional Plant Biology 42(4) 376-386 https://doi.org/10.1071/FP14247
Submitted: 12 September 2014 Accepted: 4 December 2014 Published: 12 January 2015
Abstract
High relative air humidity (RH) promotes stomatal opening in tomato leaves. This study examined the role of the plant hormones abscisic acid (ABA) and ethylene in high RH induced stomatal opening. Plants were grown in high (90%) and moderate (60%) RH or transferred from moderate to high RH. ABA levels were only slightly, but significantly decreased during darkness by increasing RH. However, a significantly higher ethylene evolution was found in high RH compared with moderate RH. Ethephon increased conductance and stomatal aperture in moderate RH. Treatment with amino-ethoxyvinylglycine (AVG) suppressed stomatal opening when plants were transferred from moderate to high RH. Similarly, blocking the ethylene receptor or using an ethylene-insensitive mutant (NR) reduced the response to high RH. These results demonstrate that both ethylene production and sensitivity play a role in high RH-induced stomatal opening in tomato leaves. The increased conductance found when plants were transferred to high RH could be counteracted by exogenous ABA spray. The ABA deficient mutant ‘Flacca’ produced high levels of ethylene irrespective of the RH and the difference in water loss and conductance between high and moderate grown ‘Flacca’ plants was attenuated compared with WT. The results indicate that both ABA and ethylene play a role in air humidity control of stomatal movement in tomato.
Additional keywords: abscisic acid, ethylene, Flacca, Never Ripe, relative air humidity, stomata.
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