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Publication Type J
Authors Mateos-Naranjo, E., J. A. Perez-Romero, S. Redondo-Gomez, J. Mesa-Marin, E. M. Castellanos and A. J. Davy
Title Salinity alleviates zinc toxicity in the saltmarsh zinc-accumulator Juncus acutus
Source Ecotoxicology and Environmental Safety
Author Keywords Chlorophyll fluorescence Gas exchange Halophyte Photoinhibition Salinity Zn-stress photosynthetic responses chlorophyll fluorescence spartina-densiflora electron-transport stress growth inhibition halophyte cadmium zn
Abstract The potential importance of Juncus acutus for remediation of Zn-contaminated lands has been recognized, because of its Zn tolerance and capacity to accumulate Zn. Since it is also a halophyte, the extent to which salinity influences its Zn tolerance requires investigation. A factorial greenhouse experiment was designed to assess the effect of NaCl supply (0 and 85 mM NaCl) on the growth, photosynthetic physiology and tissue ions concentrations of plants exposed to 0, 30 and 100 mM Zn. Our results indicated that NaCl supplementation alleviated the effects of Zn toxicity on growth, as Zn at 100 mM reduced relative growth rate (RGR) by 60% in the absence of NaCl but by only 34% in plants treated also with NaCl. This effect was linked to a reduction in Zn tissue concentrations, as well as to overall protective effects on various stages in the photosynthetic pathway. Thus, at 85 mM NaCl plants were able to maintain higher net photosynthesis (A(N)) than in the absence of added NaCl, although there were no differences in stomatal conductance (g(s)). This contributed to preserving the trade-off between CO2 acquisition and water loss, as indicated by higher intrinsic water use efficiency (iWUE). Hence, A(N) differences were ascribed to limitation in the RuBisCO carboxylation, manifested as higher intercellular CO2 concentration (C-i), together with dysfunction of PSII photochemistry (in term of light harvest and energy excess dissipation), as indicated by higher chronic photoinhibition percentages and variations in the photosynthetic pigment profiles in presence of Zn under non-saline conditions.
Author Address [Mateos-Naranjo, Enrique; Alberto Perez-Romero, Jesus; Redondo-Gomez, Susana; Mesa-Marin, Jennifer] Univ Seville, Fac Biol, Dept Biol Vegetal & Ecol, Av Reina Mercedes S-N, E-41080 Seville, Spain. [Manuel Castellanos, Eloy] Univ Huelva, Fac Ciencias Expt, Dept Biol Ambiental & Salud Publ, Huelva 21071, Spain. [Davy, Anthony John] Univ East Anglia, Sch Biol Sci, Ctr Ecol Evolut & Conservat, Norwich Res Pk, Norwich NR4 7TJ, Norfolk, England. Mateos-Naranjo, E (reprint author), Univ Seville, Fac Biol, Dept Biol Vegetal & Ecol, Av Reina Mercedes S-N, E-41080 Seville, Spain. emana@us.es
ISSN 0147-6513
ISBN 0147-6513
29-Character Source Abbreviation Ecotox. Environ. Safe.
Publication Date Nov
Year Published 2018
Volume 163
Beginning Page 478-485
Digital Object Identifier (DOI) 10.1016/j.ecoenv.2018.07.092
Unique Article Identifier WOS:000443104400056
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