Abstract
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.
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Acknowledgments
ML acknowledges a JAE-Doc contract from CSIC. Microscopy analyses were carried out at the Technical Services of the University of Granada and Estación Experimental del Zaidín (CSIC). Special thanks are given to Mr. Carmelo Ruíz-Torres for his excellent technical support. T-DNA insertion mutant seeds were provided by the Nottingham Arabidopsis Stock Centre, UK. This work was supported by ERDF-cofinanced grants from the Ministry of Economy and Competitiveness (BIO2012-33904) and Junta de Andalucía (groups BIO192 and BIO 286).
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Leterrier, M., Barroso, J.B., Valderrama, R. et al. Peroxisomal NADP-isocitrate dehydrogenase is required for Arabidopsis stomatal movement. Protoplasma 253, 403–415 (2016). https://doi.org/10.1007/s00709-015-0819-0
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DOI: https://doi.org/10.1007/s00709-015-0819-0