Ammonium stress increases microautophagic activity while impairing macroautophagic flux in Arabidopsis roots.

Plant responses to NH stress are complex, and multiple mechanisms underlying NH sensitivity and tolerance in plants may be involved. Here, we demonstrate that macro- and microautophagic activities are oppositely affected in plants grown under NH toxicity conditions. When grown under NH stress conditions, macroautophagic activity was impaired in roots.