Journal Article

Auxin response under osmotic stress

Naser, Victoria, Shani, Eilon

2016

Overview

The phytohormone auxin (indole-3-acetic acid, IAA) is a small organic molecule that coordinates many of the key processes in plant development and adaptive growth. Plants regulate the auxin response pathways at multiple levels including biosynthesis, metabolism, transport and perception. One of the most striking aspects of plant plasticity is the modulation of development in response to changing growth environments. In this review, we explore recent findings correlating auxin response-dependent growth and development with osmotic stresses. Studies of water deficit, dehydration, salt, and other osmotic stresses point towards direct and indirect molecular perturbations in the auxin pathway. Osmotic stress stimuli modulate auxin responses by affecting auxin biosynthesis ( YUC , TAA1 ), transport ( PIN ), perception ( TIR/AFB, Aux/IAA ), and inactivation/conjugation ( GH3 , miR167, IAR3 ) to coordinate growth and patterning. In turn, stress-modulated auxin gradients drive physiological and developmental mechanisms such as stomata aperture, aquaporin and lateral root positioning. We conclude by arguing that auxin-mediated growth inhibition under abiotic stress conditions is one of the developmental and physiological strategies to acclimate to the changing environment.

• Publisher: Springer Netherlands,Springer Nature B.V
• Subject: Abiotic stress / Acetic acid / aquaporins / Biochemistry / Biological Transport - drug effects / Biomedical and Life Sciences / Biosynthesis / Dehydration / Environmental changes / growth retardation / Hormones / Inactivation / indole acetic acid / Indoleacetic Acids - pharmacology / Life Sciences / Models, Biological / Molecular biology / Osmotic Pressure / osmotic stress / Physiology / Plant biology / plant development / Plant Pathology / Plant Sciences / Stomata / Stress response / Stress, Physiological - drug effects / Water deficit