Plant peroxisomes: A nitro-oxidative cocktail

Guard cells are specialized plant cells located in photosynthetic organs, mainly in leaves, that are involved in the gas exchange. The confocal laser scanning microscope pictures show in vivo peroxisomal localization of nitric oxide (NO) and peroxynitrite (ONOO-) in guard cells of transgenic Arabidopsis thaliana. Green fluorescence is attributable of either NO or ONOO- and the green fluorescence punctate corresponds to peroxisomes89