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Abstract
Phytohormone abscisic acid (ABA) plays a major role in plant adaptation to environmental stresses. ABA accumulates in response to water deficit situation and increase in ABA level promotes stomatal closure and thereby reduces leaf transpiration rate. HOS15, a DDB1-CUL4 Associated protein, was previously shown to regulate several physiological functions including freezing stress, flowering, leaf morphology, ABA-signaling and drought stress. In this review, we focused on the involvement of HOS15 in ABA-signaling. HOS15 interact with and negatively regulate OST1 which lead to fine tune ABA signaling deactivation. In fact, HOS15 is one of the major missing components in ABA-signaling core that inter-connect activation and de-activation of ABA-signaling.
Published Version
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