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Mobilization of Rubisco and Stroma-Localized Fluorescent Proteins of Chloroplasts to the Vacuole by an ATG Gene-Dependent Autophagic Process1[W][OA]

During senescence and at times of stress, plants can mobilize needed nitrogen from chloroplasts in leaves to other organs. Much of the total leaf nitrogen is allocated to the most abundant plant protein, Rubisco. While bulk degradation of the cytosol and organelles in plants occurs by autophagy, the role of autophagy in the degradation of chloroplast proteins is still unclear.We have visualized the fate of Rubisco, stroma-targeted green fluorescent protein (GFP) and DsRed, and GFP-labeled Rubisco in order to investigate the involvement of autophagy in the mobilization of stromal proteins to the vacuole. Using immunoelectron microscopy, we previously demonstrated that Rubisco is released ...

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