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Article

The Physiological Response of Different Brook Willow (Salix acmophylla Boiss.) Ecotypes to Salinity

1
Dipartimento di Scienze e Tecnologie Agrarie, Alimentari, Ambientali e Forestali (DAGRI), University of Florence, Viale Delle Idee 30, 50019 Sesto Fiorentino, Italy
2
Department of Natural Resources, Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, P.O. Box 15159, Rishon LeZion 7505101, Israel
3
Department of Biotechnology and Biosciences, University of Milano-Bicocca, Piazza Della Scienza 3, 20126 Milano, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Akihiro Ueda
Plants 2022, 11(6), 739; https://doi.org/10.3390/plants11060739
Received: 11 February 2022 / Revised: 4 March 2022 / Accepted: 8 March 2022 / Published: 10 March 2022
(This article belongs to the Section Plant Physiology and Metabolism)
Few phytoremediation studies have been conducted under semi-arid conditions where plants are subjected to drought and/or salinity stress. Although the genus Salix is frequently used in phytoremediation, information regarding its tolerance of drought and salinity is limited. In the present study, Salix acmophylla Boiss. cuttings from three sites (Adom, Darom and Mea She’arim) were tested for tolerance to salinity stress by growing them hydroponically under either control or increasing NaCl concentrations corresponding to electrical conductivities of 3 and 6 dS m−1 in a 42-day greenhouse trial. Gas exchange parameters, chlorophyll fluorescence and concentration, and water-use efficiency were measured weekly and biomass was collected at the end of the trial. Root, leaf and stem productivity was significantly reduced in the Adom ecotype, suggesting that Darom and Mea She’arim are the more salt-tolerant of the three ecotypes. Net assimilation and stomatal conductance rates in salt-treated Adom were significantly reduced by the last week of the trial, coinciding with reduced intrinsic water use efficiency and chlorophyll a content and greater stomatal aperture. In contrast, early reductions in stomatal conductance and stomatal aperture in Darom and Mea She’arim stabilized, together with pigment concentrations, especially carotenoids. These results suggest that Darom and Mea She’arim are more tolerant to salt than Adom, and provide further phenotypic support to the recently published data demonstrating their genetic similarities and their usefulness in phytoremediation under saline conditions. View Full-Text
Keywords: willow; salinity stress; phytoremediation; Salix acmophylla; salt tolerance; drought tolerance willow; salinity stress; phytoremediation; Salix acmophylla; salt tolerance; drought tolerance
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MDPI and ACS Style

Palm, E.; Klein, J.D.; Mancuso, S.; Guidi Nissim, W. The Physiological Response of Different Brook Willow (Salix acmophylla Boiss.) Ecotypes to Salinity. Plants 2022, 11, 739. https://doi.org/10.3390/plants11060739

AMA Style

Palm E, Klein JD, Mancuso S, Guidi Nissim W. The Physiological Response of Different Brook Willow (Salix acmophylla Boiss.) Ecotypes to Salinity. Plants. 2022; 11(6):739. https://doi.org/10.3390/plants11060739

Chicago/Turabian Style

Palm, Emily, Joshua D. Klein, Stefano Mancuso, and Werther Guidi Nissim. 2022. "The Physiological Response of Different Brook Willow (Salix acmophylla Boiss.) Ecotypes to Salinity" Plants 11, no. 6: 739. https://doi.org/10.3390/plants11060739

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