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The epidermal bladder cell-free mutant of the salt-tolerant quinoa challenges our understanding of halophyte crop salinity tolerance


Moog, MW and Trinh, MDL and Norrevang, AF and Bendtsen, AK and Wang, C and Osterburg, JT and Shabala, S and Hedrich, R and Wendt, T and Palmgren, M, The epidermal bladder cell-free mutant of the salt-tolerant quinoa challenges our understanding of halophyte crop salinity tolerance, The New phytologist, 236, (4) pp. 1409-1421. ISSN 1469-8137 (2022) [Refereed Article]

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Copyright 2022 The Authors. This is an open access article under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

DOI: doi:10.1111/nph.18420


Halophytes tolerate high salinity levels that would kill conventional crops. Understanding salt tolerance mechanisms will provide clues for breeding salt-tolerant plants. Many halophytes, such as quinoa (Chenopodium quinoa), are covered by a layer of epidermal bladder cells (EBCs) that are thought to mediate salt tolerance by serving as salt dumps. We isolated an epidermal bladder cell-free (ebcf) quinoa mutant that completely lacked EBCs and was mutated in REBC and REBC-like1. This mutant showed no loss of salt stress tolerance. When wild-type quinoa plants were exposed to saline soil, EBCs accumulated potassium (K+ ) as the major cation, in quantities far exceeding those of sodium (Na+ ). Emerging leaves densely packed with EBCs had the lowest Na+ content, whereas old leaves with deflated EBCs served as Na+ sinks. When the leaves expanded, K+ was recycled from EBCs, resulting in turgor loss that led to a progressive deflation of EBCs. Our findings suggest that EBCs in young leaves serve as a K+ -powered hydrodynamic system that functions as a water sink for solute storage. Sodium ions accumulate within old leaves that subsequently wilt and are shed. This mechanism improves the survival of quinoa under high salinity conditions.

Item Details

Item Type:Refereed Article
Keywords:quinoa; salt bladders; potassium; sodium; salinity stress
Research Division:Biological Sciences
Research Group:Plant biology
Research Field:Plant cell and molecular biology
Objective Division:Plant Production and Plant Primary Products
Objective Group:Grains and seeds
Objective Field:Grains and seeds not elsewhere classified
UTAS Author:Shabala, S (Professor Sergey Shabala)
ID Code:155131
Year Published:2022
Web of Science® Times Cited:1
Deposited By:Agriculture and Food Systems
Deposited On:2023-01-30
Last Modified:2023-03-20
Downloads:4 View Download Statistics

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