scholarly journals Arabidopsis CALCIUM-DEPENDENT PROTEIN KINASE8 and CATALASE3 Function in Abscisic Acid-Mediated Signaling and H2O2 Homeostasis in Stomatal Guard Cells under Drought Stress

2015 ◽  
Vol 27 (5) ◽  
pp. 1445-1460 ◽  
Author(s):  
Jun-Jie Zou ◽  
Xi-Dong Li ◽  
Disna Ratnasekera ◽  
Cun Wang ◽  
Wen-Xin Liu ◽  
...  
Keyword(s):  
Abscisic Acid ◽  
Drought Stress ◽  
Guard Cells ◽  
Calcium Dependent ◽  
Stomatal Guard Cells ◽  
Dependent Protein

scholarly journals Calcium specificity signaling mechanisms in abscisic acid signal transduction in Arabidopsis guard cells

eLife ◽  
2015 ◽  
Vol 4 ◽  
Author(s):  
Benjamin Brandt ◽  
Shintaro Munemasa ◽  
Cun Wang ◽  
Desiree Nguyen ◽  
Taiming Yong ◽  
...  
Keyword(s):  
Signal Transduction ◽  
Abscisic Acid ◽  
Stomatal Closure ◽  
Guard Cells ◽  
In Planta ◽  
Signaling Specificity ◽  
Downstream Signaling ◽  
Calcium Dependent ◽  
Quadruple Mutant ◽  
Dependent Protein

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.

scholarly journals Two Calcium-Dependent Protein Kinases, CPK4 and CPK11, Regulate Abscisic Acid Signal Transduction in Arabidopsis

2007 ◽  
Vol 19 (10) ◽  
pp. 3019-3036 ◽  
Author(s):  
Sai-Yong Zhu ◽  
Xiang-Chun Yu ◽  
Xiao-Jing Wang ◽  
Rui Zhao ◽  
Yan Li ◽  
...  
Keyword(s):  
Signal Transduction ◽  
Abscisic Acid ◽  
Protein Kinases ◽  
Calcium Dependent ◽  
Dependent Protein ◽  
Calcium Dependent Protein Kinases
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