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Publication Type J
Authors Pujol, J. A., J. F. Calvo and L. Ramirez-Diaz
Title Seed germination, growth, and osmotic adjustment in response to NaCl in a rare succulent halophyte from southeastern Spain
Source Wetlands
Author Keywords ion accumulation; glycinebetaine; proline; osmotic potential; salt stress SARCOBATUS-VERMICULATUS; SPARTINA-ALTERNIFLORA; ION ACCUMULATION; GLYCINE BETAINE; SALT TOLERANCE; SALINITY; PROLINE; PLANTS; CHENOPODIACEAE; PATTERNS
Abstract In this paper, some issues of the autoecology of Halocnemum strobilaceum (a rare succulent halophyte that occurs in southeastern Spain) are examined, particularly the germination process and the first stages of plant development. In regards to germination, this species shows the general pattern of halophytes under increased salt stress (reduced germination and germination rate). What stands out is the extreme salt tolerance of H. strobilaceum seeds. The stimulation of root length by the presence of salt probably plays an important role in avoiding salt stress at surface-level soils, within salt concentrations where germination still occurs. Halocnemum strobilaceum typically accumulates Na+ ions, which, combined with Cl-, contributes to the internal osmotic potential. The accumulation of both ions clearly increases with an increase in salinity stress. In contrast, accumulation of K+, Mg2+, and Ca2+ decreases with an increase in salinity stress. Glycine- betaine contents are approximately 100 times greater than proline contents, although their contribution was significant only if cell compartmentalization was considered. The accumulation of ions along with the osmotic protective compounds glycinebetaine and proline allows seedlings to mantain a lower internal osmotic potential than that of the growth medium, which is necessary for water uptake in saline soils.
Author Address Univ Murcia, Inst Agua & Medio Ambiente, Edificio D, E-30100 Murcia, Spain Univ Murcia, Inst Agua & Medio Ambiente, E-30100 Murcia, Spain Univ Murcia, Dept Ecol & Hidrol, E-30100 Murcia, Spain Pujol JA Univ Murcia, Inst Agua & Medio Ambiente, Edificio D, E-30100 Murcia, Spain
29-Character Source Abbreviation Wetlands
Publication Date Jun
Year Published 2001
Volume 21
Issue 2
Beginning Page 256-264
Unique Article Identifier ISI:000169412900010
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