Excess iron stress reduces root tip zone growth through nitric oxide-mediated repression of potassium homeostasis in Arabidopsis

Excess iron stress reduces root tip zone growth through nitric oxide-mediated repression of potassium homeostasis in Arabidopsis

© 2018 The Authors. New Phytologist © 2018 New Phytologist Trust.

Bibliographische Detailangaben
Veröffentlicht in:The New phytologist. - 1979. - 219(2018), 1 vom: 16. Juli, Seite 259-274
1. Verfasser: Zhang, Lin (VerfasserIn)
Weitere Verfasser: Li, Guangjie, Wang, Meng, Di, Dongwei, Sun, Li, Kronzucker, Herbert J, Shi, Weiming
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2018
Zugriff auf das übergeordnete Werk:The New phytologist
Schlagworte:Journal Article Research Support, Non-U.S. Gov't Arabidopsis SNO1/SOS4 Fe excess K+ efflux K+ homeostasis nitric oxide primary root growth root tip zone mehr... Arabidopsis Proteins Ethylenes Nitric Oxide 31C4KY9ESH ethylene 91GW059KN7 Iron E1UOL152H7 AT5G37850 protein, Arabidopsis EC 2.7.1.35 Pyridoxal Kinase Potassium RWP5GA015D
Beschreibung
Zusammenfassung:© 2018 The Authors. New Phytologist © 2018 New Phytologist Trust.
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 nitric oxide 1)/SOS4 (salt overly sensitive 4) and reduced root tip zone cell viability. Moreover, ethylene can antagonize excess Fe-inhibited root growth and K+ efflux, in part by the control of root tip NO levels. We conclude that excess Fe attenuates root growth by effecting an increase in root tip zone NO, and that this attenuation is related to NO-mediated alterations in K+ homeostasis, partly via SNO1/SOS4
Beschreibung:Date Completed 30.09.2019
Date Revised 30.09.2020
published: Print-Electronic
Citation Status MEDLINE
ISSN:1469-8137
DOI:10.1111/nph.15157