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Publication Type J
Authors Li, R., F. Shi and K. Fukuda
Title Interactive effects of salt and alkali stresses on seed germination, germination recovery, and seedling growth of a halophyte Spartina alterniflora (Poaceae)
Source South African Journal of Botany
Author Keywords Germination recovery Salt-alkaline mixed stress Seed germination Seedling growth Spartina alterniflora halocnemum-strobilaceum aneurolepidium-chinense haloxylon-ammodendron radicle growth marsh plants suaeda-salsa salinity chenopodiaceae temperature accumulation
Abstract Soil salinization and alkalinization frequently co-occur in nature, but there is little information on the interactive effects of salt and alkali stresses on plants. Seed germination and early seedling growth are crucial stages for plant establishment. We investigated the interactive effects of salt and alkali stresses on seed germination, germination recovery and seedling growth of a halophyte Spartina alterniflora. Seed germination percentage was not significantly reduced at low salinity (<= 200 mM) at pH 6.63-9.95, but decreased with increased salinity and pH. Ungerminated seeds germinated well after transfer to distilled water from treatment solutions, indicating that seeds can remain viable in high salt alkaline habits. Shoot growth was stimulated at low salinity and pH, but decreased with increased salinity and pH. Radicle elongation decreased sharply with increased salinity and pH, and was significantly inhibited when pH >= 9.0, indicating that the radicles are very sensitive to salt alkaline stress. The deleterious effects of salinity or high pH alone were less than when combined. A reciprocal enhancement of salt and alkali stresses is a characteristic feature for salt alkaline stress. Stepwise regression analysis indicates that salinity is the dominant factor, while pH and buffer capacity are secondary for salt alkaline mixed stress. (C) 2010 SAAB. Published by Elsevier B.V. All rights reserved.
Author Address [Li, R; Shi, F] Nankai Univ, Coll Life Sci, Tianjin 300071, Peoples R China [Li, R; Fukuda, K] Univ Tokyo, Grad Sch Frontier Sci, Kashiwa, Chiba 2778563, Japan Shi, F (reprint author), Nankai Univ, Coll Life Sci, Weijin Rd 94, Tianjin 300071, Peoples R China fcshi@nankai.edu.cn
ISSN 0254-6299
ISBN 0254-6299
29-Character Source Abbreviation S. Afr. J. Bot.
Publication Date Apr
Year Published 2010
Volume 76
Issue 2
Beginning Page 380-387
Digital Object Identifier (DOI) 10.1016/j.sajb.2010.01.004
Unique Article Identifier WOS:000277902300026
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