engleski

Auxin as mediator in abiotic stress responses

As sessile organisms plants are often exposed to unfavorable environmental conditions (abiotic stress). Considerable losses in crop productivity all over the world are caused by abiotic stresses such as water, temperature, and salinity stresses. Phytohormones are crucial for the ability of plants to adapt to abiotic stress by mediating a wide range of adaptive responses such as modification of photosynthesis, increased antioxidant activities, secondary metabolites accumulation, changes in protein profile and activity as well as gene expression. In recent years emerging evidence suggests that phytohormone auxin acts as a common player in the majority of hormonal interactions in stress conditions. Auxin, ROS, and antioxidants, such as ascorbate, GSH and related proteins, have been proposed to form a redox signaling module that links plant development with environmental cues. Research on a variety of plant species demonstrated that auxin homeostasis directly links growth regulation with stress adaptation responses. Here, we summarize the recent findings on the auxin as a part of complex signaling network. We discuss on how plants utilize auxin signaling and transport to modify growth plasticity when responding to diverse abiotic stresses such as temperature, water stress and increased salinity. Furthermore, we focus on the importance of the crosstalk between auxin and stress hormones, such as abscisic acid, jasmonate, salicylic acid, and ethylene, in stress responses and potential adaptation.

Abiotic stress ; Auxin amidohydrolase ; Auxin conjugate synthetasis, Auxin homeostasis, Auxin-stress hormone crosstalk, Indole-3-acetic acid ; Indole-3-butyric acid ; Reactive oxigen species

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