Figure 4From: Conservation between higher plants and the moss Physcomitrella patensin response to the phytohormone abscisic acid: a proteomics analysisComparison of the ABA response processes of A. thaliana (Angiosperm) and P. patens (Bryophyte). ABA signals are perceived by receptor protein kinases and transduced through signaling intermediates to the calcium-dependent protein kinases (CDPKs) and Ser/Thr specific protein kinase, etc. Activated protein kinases phosphorylate and thus activate transcription factors. Subsequently, transcription factors (bZIP factors, MYB, and WRKY, etc) mediate gene expression and protein synthesis in response to ABA treatment. They share three major physiological and biochemical reactions: increase of respiration and defenses, and inhibition of photosynthesis.Back to article page