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2831384 
Journal Article 
Peroxisomal NADP-isocitrate dehydrogenase is required for Arabidopsis stomatal movement 
Leterrier, M; Barroso, JB; Valderrama, R; Begara-Morales, JC; Sánchez-Calvo, B; Chaki, M; Luque, F; Viñegla, B; Palma, JM; Corpas, FJ 
2015 
Protoplasma
ISSN: 0033-183X
EISSN: 1615-6102 
253 
403-415 
English 
Peroxisomes are subcellular organelles characterized by a simple morphological structure but have a complex biochemical machinery involved in signaling processes through molecules such as hydrogen peroxide (H2O2) and nitric oxide (NO). Nicotinamide adenine dinucleotide phosphate (NADPH) is an essential component in cell redox homeostasis, and its regeneration is critical for reductive biosynthesis and detoxification pathways. Plants have several NADPH-generating dehydrogenases, with NADP-isocitrate dehydrogenase (NADP-ICDH) being one of these enzymes. Arabidopsis contains three genes that encode for cytosolic, mitochondrial/chloroplastic, and peroxisomal NADP-ICDH isozymes although the specific function of each of these remains largely unknown. Using two T-DNA insertion lines of the peroxisomal NADP-ICDH designated as picdh-1 and picdh-2, the data show that the peroxisomal NADP-ICDH is involved in stomatal movements, suggesting that peroxisomes are a new element in the signaling network of guard cells. 
Nitric oxide; Hydrogen peroxide; NADP-isocitrate dehydrogenase; Peroxisomes; Stomata; Guard cells