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Germination Response to Osmotic Potential, Osmotic Agents, and Temperature of Five Halophytes Occurring along a Salinity Gradient
Consejo Nacl Invest Cient & Tecn, Argentina.; Justus Liebig Univ Giessen, Germany..
Consejo Nacl Invest Cient & Tecn, Argentina.; Univ Nacl Sur, Argentina.
Univ Kiel, Germany.
Univ Nacl Sur, Argentina.; Consejo Nacl Invest Cient & Tecn, Argentina.
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2019 (English)In: International journal of plant sciences, ISSN 1058-5893, E-ISSN 1537-5315, Vol. 180, no 4, p. 345-355Article in journal (Refereed) Published
Abstract [en]

Premise of research. Halophyte species grow where salt concentrations are high. Still, their germination may be affected by salts, either by creating an osmotic potential that prevents water uptake or by dissociating in ions that can cause different grades of toxicity. With the increase of salinized areas, it becomes important to understand the behavior of these species. Methodology. We studied how the germination of five halophyte species that occur along a salinity gradient in the Bahia Blanca coastal zone, Atriplex undulata, Cyclolepis genistoides, Allenrolfea patagonica, Sarcocornia perennis, and Heterostachys ritteriana, responds to variations in osmotic agents, osmotic potential, and temperature. Seeds were exposed to different osmotic potentials using NaCl (neutral salt), Na2CO3 (alkaline salt), and mannitol solutions in a germination chamber experiment. Germination was recorded during 42 d. Germination percentage, mean germination time, and synchrony were calculated. Pivotal results. Our experimental results showed that for the five halophyte species under study, germination was mostly driven by osmotic potentials and osmotic agents. At high osmotic potential, the germination response did not differ significantly from controls, except for Allenrolfea and Cyclolepis, which showed lower germination when treated with Na2CO3. Low osmotic potentials and Na2CO3 were detrimental to germination, reflected by lower germination percentages, higher mean germination times, and lower synchrony. Conclusions. In general, the response to the alkaline salt was more negative than that to the neutral salt or mannitol, regardless of the species. Each species showed a different response to the salts under study, and this response matched well with the distribution of species along the salinity gradient observed in the field.

Place, publisher, year, edition, pages
University of Chicago Press, 2019. Vol. 180, no 4, p. 345-355
Keywords [en]
salt tolerant, semiarid, mannitol, NaCl, Na2CO3
National Category
Biological Sciences
Research subject
Biology
Identifiers
URN: urn:nbn:se:kau:diva-72119DOI: 10.1086/702663ISI: 000467142600006OAI: oai:DiVA.org:kau-72119DiVA, id: diva2:1317642
Available from: 2019-05-23 Created: 2019-05-23 Last updated: 2019-05-23Bibliographically approved

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Eckstein, Rolf Lutz

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