Ascorbate Glutathione Cycle and Ultrastructural Analyses of Two Kenaf Cultivars (Hibiscus cannabinus L.) under Chromium Stress Deciphering Antioxidant Responses in Tomato Autografts The impact of engineered nickel oxide nanoparticles on ascorbate glutathione cycle in Allium cepa L. Physiology and Molecular Biology of Plants Springer Nature Link Frontiers Endophytic fungus Serendipita indica accelerates ascorbate glutathione cycle of white clover in response to water stress In the absence of other acceptors electrons can be transferred from photosystem I to oxygen