Auxin acts downstream of ethylene and nitric oxide to regulate magnesium deficiency-Induced root hair development in Arabidopsis thaliana
2018
Liu, M. ((Hangzhou Normal University, Hangzhou (China). College of Life and Environmental Sciences), (Zhejiang University, Hangzhou (China). College of Environmental and Resource Sciences, State Key Laboratory of Plant Physiology and Biochemistry)) | Zhang, H. | Fang, X. | Zhang, Y. | Jin, C.
This study examines the association of auxin with ethylene and nitric oxide (NO) in regulating the magnesium (Mg) deficiency-induced root hair development in Arabidopsis thaliana. With Mg deficiency, both ethylene and NO promoted the elevation of root auxin levels in roots by inducing the expression of AUXIN-RESISTANT1 (AUX1), PINFORMED1 (PIN1) and PIN2 transporters. In turn, auxin stimulated ethylene and NO production by activating the activities of 1-aminocyclopropane-1-carboxylate (ACC) oxidase (ACO), ACC synthase (ACS), nitrate reductase (NR) and NO synthase-like (NOS-L). These processes constituted an NO/ethylene-auxin feedback loop. Interestingly, however, the roles of ethylene and NO in regulating Mg deficiency-induced root hair development required the action of auxin, but not vice versa. In summary, these results suggest that Mg deficiency induces a positive interaction between the accumulation of auxin and ethylene/NO in roots, with auxin acting downstream of ethylene and NO signals to regulate Mg deficiency-induced root hair morphogenesis.
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