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Mittal, Rahul ; Debs, Luca H. ; Patel, Amit P. ; Nguyen, Desiree ; Patel, Kunal ; O'Connor, Gregory ; Grati, M'hamed ; Mittal, Jeenu ; Yan, Denise ; Eshraghi, Adrien A. ; et al ( , Journal of Cellular Physiology)
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Brandt, Benjamin ; Munemasa, Shintaro ; Wang, Cun ; Nguyen, Desiree ; Yong, Taiming ; Yang, Paul G ; Poretsky, Elly ; Belknap, Thomas F ; Waadt, Rainer ; Alemán, Fernando ; et al ( , eLife)
A central question is how specificity in cellular responses to the eukaryotic second messenger Ca2+ is achieved. Plant guard cells, that form stomatal pores for gas exchange, provide a powerful system for in depth investigation of Ca2+-signaling specificity in plants. In intact guard cells, abscisic acid (ABA) enhances (primes) the Ca2+-sensitivity of downstream signaling events that result in activation of S-type anion channels during stomatal closure, providing a specificity mechanism in Ca2+-signaling. However, the underlying genetic and biochemical mechanisms remain unknown. Here we show impairment of ABA signal transduction in stomata of calcium-dependent protein kinase quadruple mutant plants. Interestingly, protein phosphatase 2Cs prevent non-specific Ca2+-signaling. Moreover, we demonstrate an unexpected interdependence of the Ca2+-dependent and Ca2+-independent ABA-signaling branches and the in planta requirement of simultaneous phosphorylation at two key phosphorylation sites in SLAC1. We identify novel mechanisms ensuring specificity and robustness within stomatal Ca2+-signaling on a cellular, genetic, and biochemical level.