Journal article
Excess iron stress reduces root tip zone growth through nitric oxide-mediated repression of potassium homeostasis in Arabidopsis
L Zhang, G Li, M Wang, D Di, L Sun, HJ Kronzucker, W Shi
New Phytologist | WILEY | Published : 2018
DOI: 10.1111/nph.15157
Abstract
The root tip zone is regarded as the principal action site for iron (Fe) toxicity and is more sensitive than other root zones, but the mechanism underpinning this remains largely unknown. We explored the mechanism underpinning the higher sensitivity at the Arabidopsis root tip and elucidated the role of nitric oxide (NO) using NO-related mutants and pharmacological methods. Higher Fe sensitivity of the root tip is associated with reduced potassium (K+) retention. NO in root tips is increased significantly above levels elsewhere in the root and is involved in the arrest of primary root tip zone growth under excess Fe, at least in part related to NO-induced K+ loss via SNO1 (sensitive to nitri..
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Awarded by University of Melbourne
Funding Acknowledgements
We thank Drs Caifu Jiang (China Agricultural University), Tom Guilfoyle (University of Missouri), Ben Scheres (Utrecht University) and Ningning Wang (Nankai University) for providing the seeds of eto2-1, DR5: GUS, DR5: GFP and ACS7: GUS lines, respectively, Dr GuangQin Guo (Lanzhou University), Dr J. Alonso (North Carolina State University) and Dr Yanhua Su (Institute of Soil Science) for providing seeds of DR5: GUS in wei7-2, EBS: GUS reporter lines and gork1 mutant, respectively, and the Arabidopsis Biological Resource Center of Ohio State University for mutant seeds. This work was supported by the National Natural Science Foundation of China (31430095), the National Key R& D Program of China (2017YFD0200103), the National Natural Science Foundation of China (31501821), the Chinese Academy of Sciences Innovation Program (CAS ISSASIP1604) and the University of Melbourne.