Abstract
Plants have evolved elaborate mechanisms to perceive and integrate signals from various environmental conditions. On leaf surface, stomata formed by pairs of guard cells mediate gas exchange, water transpiration as well as function in response to abiotic and biotic stresses. Stomatal closure could be induced by drought, salt, pathogen and other adverse conditions. This constitutes an instant defense response to prevent further damage to plants. Abscisic acid (ABA) is a major plant hormone involved in stress responses. Stress-activated ABA synthesis causes stomatal closure and prevents opening to reduce water loss and cell dehydration. Key regulatory receptor complex and other important components in the ABA signaling pathway have been identified. However, our knowledge of ABA signal transduction in guard cells is far from complete. Jasmonates are a group of phytohormones generally known to be important for plant defense against insects and necrotrophic pathogens. The increased levels of methyl jasmonate (MeJA) induced by herbivory and pathogen invasion show a similar effect on stomatal movement associated with ROS production as ABA. Investigation of guard cell signaling networks involving the two important phytohormones is significant and exciting. Information about protein and metabolite components and how they interact in guard cells is lacking. Here we review recent advances on hormone signaling networks in guard cells and how the networks integrate environmental signals to plant physiological output.
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Zhu, M., Dai, S. & Chen, S. The stomata frontline of plant interaction with the environment-perspectives from hormone regulation. Front. Biol. 7, 96–112 (2012). https://doi.org/10.1007/s11515-012-1193-3
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DOI: https://doi.org/10.1007/s11515-012-1193-3