Auxin response under osmotic stress
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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.
KeywordsAuxin response Auxin metabolism Auxin biosynthesis Auxin transport Auxin perception Osmotic stress Drought stress Abiotic stress Hormone-stress crosstalk
We thank Claus Schwechheimer (TUM), Doron Shkolnik-Inbar (TAU) and Mark Estelle (UCSD) for critically reading the article and for helpful suggestions. Research on related topics in the Shani lab is supported by grants from the Israel Science Foundation (1832/14) and (2158/14), GIF, the German-Israeli Foundation for Scientific Research and Development (I-236-203.17-2014), and the Human Frontier Science Program (HFSP-RGY0075/2015).
Victoria Naser and Eilon Shani wrote the manuscript.
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