Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/112279
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Type: Journal article
Title: Kinetics of xylem loading, membrane potential maintenance, and sensitivity of K⁺-permeable channels to reactive oxygen species: physiological traits that differentiate salinity tolerance between pea and barley
Other Titles: Kinetics of xylem loading, membrane potential maintenance, and sensitivity of K(+)-permeable channels to reactive oxygen species: physiological traits that differentiate salinity tolerance between pea and barley
Author: Bose, J.
Shabala, L.
Pottosin, I.
Zeng, F.
Velarde-Buendía, A.
Massart, A.
Poschenrieder, C.
Hariadi, Y.
Shabala, S.
Citation: Plant, Cell and Environment, 2014; 37(3):589-600
Publisher: Wiley
Issue Date: 2014
ISSN: 0140-7791
1365-3040
Statement of
Responsibility: 
Jayakumar Bose, Lana Shabala, Igor Pottosin, Fanrong Zeng, Ana-Maria Velarde-Buendía, Amandine Massart, Charlotte Poschenrieder, Yuda Hariadi, Sergey Shabala
Abstract: Salt sensitive (pea) and salt tolerant (barley) species were used to understand the physiological basis of differential salinity tolerance in crops. Pea plants were much more efficient in restoring otherwise depolarized membrane potential thereby effectively decreasing K⁺ efflux through depolarization-activated outward rectifying potassium channels. At the same time, pea root apex was 10-fold more sensitive to physiologically relevant H₂O₂ concentration and accumulated larger amounts of H₂O₂ under saline conditions. This resulted in a rapid loss of cell viability in the pea root apex. Barley plants rapidly loaded Na⁺ into the xylem; this increase was only transient, and xylem and leaf Na⁺ concentration remained at a steady level for weeks. On the contrary, pea plants restricted xylem Na⁺ loading during the first few days of treatment but failed to prevent shoot Na⁺ elevation in the long term. It is concluded that superior salinity tolerance of barley plants compared with pea is conferred by at least three different mechanisms: (1) efficient control of xylem Na⁺ loading; (2) efficient control of H₂O₂ accumulation and reduced sensitivity of non-selective cation channels to H₂O₂ in the root apex; and (3) higher energy saving efficiency, with less ATP spent to maintain membrane potential under saline conditions.
Keywords: H⁺-ATPase; ion channels; membrane depolarization; potassium homeostasis
Rights: © 2013 John Wiley & Sons Ltd
RMID: 0030031560
DOI: 10.1111/pce.12180
Appears in Collections:Agriculture, Food and Wine publications

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