Salicylic acid induces stomatal closure by modulating endogenous hormone levels in cucumber cotyledons

Salicylic acid induces stomatal closure by modulating endogenous hormone levels in cucumber... Salicylic acid (SA) is one of the most important signaling molecules in plant growth and defense responses to biotic and abiotic stresses. Here, the effect of exogenous SA on the stomatal movements was investigated in cotyledons of cucumber (Cucumis sativus L.) seedlings. Application of different SA concentrations could induce the reduction in stomatal aperture and conductance, especially at a concentration of 0.5 mM. Using the isolated epidermal strips, stomata were found to close notably in response to exogenous SA, even at a concentration as low as 0.001 mM. Further study showed that a SA-induced decrease in the stomatal aperture was intensified by the higher SA concentrations, longer exposure, and lower pH of the medium. In addition, to understand the relationship between stomatal closure and endogenous hormone contents, the levels of ABA, IAA, and gibberellin (GA3) were assayed under SA treatment. SA significantly increased endogenous ABA but not IAA and GA3 content. A significant negative correlation (p ≤ 0.01) was observed between stomatal conductance and the ratio of ABA to (GA3 + IAA) during SA application. It was suggested that exogenous SA could change the balance of endogenous hormones and thereby induce stomatal closure in cotyledons of cucumber seedlings. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Plant Physiology Springer Journals

Salicylic acid induces stomatal closure by modulating endogenous hormone levels in cucumber cotyledons

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Publisher
Springer Journals
Copyright
Copyright © 2011 by Pleiades Publishing, Ltd.
Subject
Life Sciences; Plant Physiology; Plant Sciences
ISSN
1021-4437
eISSN
1608-3407
D.O.I.
10.1134/S1021443711050098
Publisher site
See Article on Publisher Site

Abstract

Salicylic acid (SA) is one of the most important signaling molecules in plant growth and defense responses to biotic and abiotic stresses. Here, the effect of exogenous SA on the stomatal movements was investigated in cotyledons of cucumber (Cucumis sativus L.) seedlings. Application of different SA concentrations could induce the reduction in stomatal aperture and conductance, especially at a concentration of 0.5 mM. Using the isolated epidermal strips, stomata were found to close notably in response to exogenous SA, even at a concentration as low as 0.001 mM. Further study showed that a SA-induced decrease in the stomatal aperture was intensified by the higher SA concentrations, longer exposure, and lower pH of the medium. In addition, to understand the relationship between stomatal closure and endogenous hormone contents, the levels of ABA, IAA, and gibberellin (GA3) were assayed under SA treatment. SA significantly increased endogenous ABA but not IAA and GA3 content. A significant negative correlation (p ≤ 0.01) was observed between stomatal conductance and the ratio of ABA to (GA3 + IAA) during SA application. It was suggested that exogenous SA could change the balance of endogenous hormones and thereby induce stomatal closure in cotyledons of cucumber seedlings.

Journal

Russian Journal of Plant PhysiologySpringer Journals

Published: Aug 21, 2011

References

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