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Publication Type J
Authors Song, J., G. Feng, C. Y. Tian and F. S. Zhang
Title Strategies for adaptation of Suaeda physophora, Haloxylon ammodendron and Haloxylon persicum to a saline environment during seed-germination stage
Source Annals of Botany
Author Keywords adaptation embryo germination halophyte Haloxylon ammodendron Haloxylon persicum ion compartmentalization ion toxicity osmotic stress seed coat Suaeda physophora xerophyte salt tolerance sodium-chloride desert shrubs growth chenopodiaceae halophytes temperature ion potassium recovery
Abstract Background and Aims Germination is very important for plant establishment in arid regions. The strategies taken by halophytes during the seed germination stage to adapt to saline environments in an arid zone were investigated in Suaeda physophora (euhalophyte), Haloxylon ammodendron (xero-halophyte) and Haloxylon persicum (xerophyte). Methods Seeds of S. physophora, H. ammodendron and H. persicum were exposed to a range of iso-osmotic NaCl and PEG solutions. Seed germination in, and recovery germination from, high NaCl were recorded. The effects of iso-osmotic NaCl and PEG on seed water uptake and changes in ion content were measured. In addition, the structure of seeds and Na+ distribution in the seed coat and embryos of dry seeds were investigated. Key Results The relative increase in fresh weight of germinating seeds was markedly reduced in -2.24 MPa PEG compared with that in -2.24 MPa NaCl, while the opposite trend was found in concentration of K+ during the initial 9 h for all species. Haloxylon ammodendron and S. physophora had a higher recovery germination from -3.13 MPa NaCl compared with H. persicum. Seeds of all species had no endosperm. More Na+ was compartmentalized in the seed coats of the two halophytic species compared with that in the xerophyte H. persicum. Conclusions The effect of NaCl on seed germination was due to both osmotic stress and ion toxicity for the three species. High soil salinity and a high content of Na+ in seeds may induce more seeds to remain ungerminated in S. physophora and H. ammodendron. Morphological structure and adaptation to salinity during seed germination may determine the geographical distribution of H. ammodendron and S. physophora in certain saline regions.
Author Address China Agr Univ, Coll Resource & Environm Sci, Beijing 100094, Peoples R China. Acad Sinica, Inst Ecol & Geog, Urumqi 830000, Peoples R China. Shandong Normal Univ, Coll Life Sci, Jinan 250014, Peoples R China. Feng, G (reprint author), China Agr Univ, Coll Resource & Environm Sci, Beijing 100094, Peoples R China. fenggu@cau.edu.cn
ISSN 0305-7364
ISBN 0305-7364
29-Character Source Abbreviation Ann. Bot.
Publication Date Sep
Year Published 2005
Volume 96
Issue 3
Beginning Page 399-405
Digital Object Identifier (DOI) 10.1093/aob/mci196
Unique Article Identifier WOS:000231363200006
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