Exogenous Auxin-Mediated Salt Stress Alleviation in Faba Bean (Vicia faba L.)

Auxin not only controls the development processes, but also regulates stress responses of plants. In this investigation, we explored potential roles exogenously applied indole-3-acetic acid (IAA) in conferring salt tolerance faba bean (Vicia L.). Our results showed that foliar application IAA (200 ppm) to salt-exposed (60 mM and 150 NaCl) plants promoted growth, which was evidenced by enhanced root–stem traits. ensured better osmotic protection salt-stressed supported reduced proline soluble sugar, protein, total free amino contents roots, stem, seeds. increased number nodules plants, may facilitate nitrogen assimilation. Moreover, mediated improvements mineral homeostasis (K+, Ca2+, Mg2+) translocation Na+, while it inhibited excessive accumulation Na+ roots. Salt-induced oxidative damage resulted malondialdehyde, whereas spraying relegated malondialdehyde improving antioxidant enzymes, including superoxide dismutase, catalase, peroxidase, ascorbate peroxidase. Together, these together with a principal component analysis uncovered alleviated antagonistic effects via enhancing osmolyte accumulation, ionic homeostasis, activity. Finally, exogenous yield broad beans under high salinity conditions.