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

Autor: Moog MW; Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, DK-1871, Frederiksberg C, Denmark., Trinh MDL; Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, DK-1871, Frederiksberg C, Denmark., Nørrevang AF; Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, DK-1871, Frederiksberg C, Denmark., Bendtsen AK; Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, DK-1871, Frederiksberg C, Denmark., Wang C; Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, DK-1871, Frederiksberg C, Denmark., Østerberg JT; Carlsberg Research Laboratory, J.C. Jacobsens Gade 4, DK-1799, Copenhagen V, Denmark.; Traitomic, Carlsberg A/S, J.C. Jacobsens Gade 4, 1799, Copenhagen V, Denmark., Shabala S; School of Land and Food, University of Tasmania, Hobart, Tas., 7001, Australia.; International Research Centre for Environmental Membrane Biology, Foshan University, Foshan, 528000, China.; School of Biological Science, University of Western Australia, Perth, WA, 6009, Australia., Hedrich R; Julius-von-Sachs-Institut für Biowissenschaften, Biozentrum, University of Würzburg, D-97082, Würzburg, Germany., Wendt T; Carlsberg Research Laboratory, J.C. Jacobsens Gade 4, DK-1799, Copenhagen V, Denmark.; Traitomic, Carlsberg A/S, J.C. Jacobsens Gade 4, 1799, Copenhagen V, Denmark., Palmgren M; Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, DK-1871, Frederiksberg C, Denmark.; School of Land and Food, University of Tasmania, Hobart, Tas., 7001, Australia.
Jazyk: angličtina
Zdroj: The New phytologist [New Phytol] 2022 Nov; Vol. 236 (4), pp. 1409-1421. Date of Electronic Publication: 2022 Aug 30.
DOI: 10.1111/nph.18420
Abstrakt: 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.
(© 2022 The Authors. New Phytologist © 2022 New Phytologist Foundation.)
Databáze: MEDLINE
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