Abscisic Acid Machinery Is under Circadian Clock Regulation at Multiple Levels

Abscisic acid (ABA) is recognized as the key hormonal regulator of plant stress physiology. This phytohormone also involved in growth and development under normal conditions. Over last 50 years components ABA machinery have been well characterized, from synthesis to molecular perception signaling; knowledge about fine regulation these starting increase. In this article, we review a particular that comes circadian system extends multiple levels. The clock self-sustained oscillator perceives external changes prepares plants respond them advance. constitutes most important predictive homeostasis mechanism living beings. Moreover, has several output pathways control molecular, cellular physiological downstream processes, such response transcriptional activity. One outputs involves machinery. regulate expression post-translational modification elements, signaling response. establishes gating during day, which tunes stomatal closure