IADO   05364
INSTITUTO ARGENTINO DE OCEANOGRAFIA
Unidad Ejecutora - UE
artículos
Título:
Germination Response to Osmotic Potential, Osmotic Agents, and Temperature of Five Halophytes Occurring along a Salinity Gradient
Autor/es:
PRATOLONGO, PAULA; ECKSTEIN, ROLF LUTZ; DONATH, TOBIAS W.; PIOVAN, MARÍA JULIA; LOYDI, ALEJANDRO
Revista:
INTERNATIONAL JOURNAL OF PLANT SCIENCES
Editorial:
UNIV CHICAGO PRESS
Referencias:
Año: 2019 vol. 180 p. 345 - 355
ISSN:
1058-5893
Resumen:
Premise of research. Halophyte species grow where salt concentrations are high. Still, their germination maybe affected by salts, either by creating an osmotic potential that prevents water uptake or by dissociating in ionsthat 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 Bahía Blanca coastal zone, Atriplex undulata, Cyclolepis genistoides, Allenrolfea patagonica, Sarcocorniaperennis, 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 germinationresponse did not differ significantly from controls, except for Allenrolfea and Cyclolepis, which showed lowergermination 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 ormannitol, regardless of the species. Each species showed a different response to the salts under study, and thisresponse matched well with the distribution of species along the salinity gradient observed in the field.