A Glutathione-Dependent Control of the Indole Butyric Acid Pathway Supports Arabidopsis Root System Adaptation to Phosphate Deprivation

The study investigated the role of glutathione in the indole butyric acid (IBA) pathway and its impact on root system adaptation in Arabidopsis under phosphate deprivation. It was found that glutathione deficiency affected lateral roots and root hair responses to IBA but not to indole acetic acid (IAA). Genetic analyses indicated that glutathione might regulate IBA homeostasis or its conversion to IAA in the root cap. Both glutathione and IBA were essential for the root hair response to phosphate deprivation, highlighting the importance of glutathione-dependent regulation of the auxin pathway in plant adaptation to environmental conditions.