Frontiers Endophytic fungus Serendipita indica accelerates ascorbate glutathione cycle of white clover in response to water stress Frontiers Nitric oxide delays yellowing by regulating chloroplast membrane lipid metabolism and the ascorbateglutathione cycle in postharvest broccolini Imaging glutathione depletion in the rat brain using ascorbate derived hyperpolarized MR and PET probes PeerJ Exogenous glutathione maintains the postharvest quality of mango fruit by modulating the ascorbate glutathione cycle