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Publication Type J
Authors Zeng, Y. J., Y. R. Wang, C. C. Baskin and J. M. Baskin
Title Testing seed germination responses to water and salinity stresses to gain insight on suitable microhabitats for restoration of cold desert shrubs
Source Journal of Arid Environments
Author Keywords Desert shrub Halophyte Nitraria Salinity Water limitation Xerophytes nitraria-tangutorum bobr. sibirica pall china
Abstract Although congeneric species grow in the same desert, responses of their seeds to water and salinity stress may differ, thus resulting in variation in microhabitats that are suitable for restoration. Experiments were performed to determine seed germination responses to water limitation and salinity stress (imposed by increasing concentrations of polyethylene glycol (PEG) and sodium chloride (NaCl), respectively) of Nitraria tangutorum and Nitraria sibirica, two xerophytic and halophytic shrubs in the cold deserts of northwest China. Germination percentages of both species decreased with a decrease in PEG water potentials. The lowest PEG water potential for germination was -0.9 MPa for N. tangutorum and -1.5 MPa for N. sibirica. All concentrations of NaCl had negative effects on germination of N. tangutorum seeds, whereas germination of N. sibirica was promoted under low salinity (-0.3 MPa NaCl). The lowest osmotic potential of NaCl solutions under which seeds could germinate was -1.2 MPa for N. tangutorum and -1.8 MPa for N. sibirica. These germination responses to water limitation and salinity generally were correlated with the ecological distribution of the two species in the desert and indicate that seeds of N. sibirica potentially would germinate in more stressful microhabitats than those of N. tangutorum. (C) 2013 Elsevier Ltd. All rights reserved.
Author Address [Zeng, Y. J.; Wang, Y. R.] Lanzhou Univ, Coll Pastoral Agr Sci & Technol, Key Lab Grassland Agroecosyst, State Key Lab Grassland Agroecosyst,Minist Agr, Lanzhou 730020, Peoples R China. [Baskin, C. C.] Univ Kentucky, Dept Plant & Soil Sci, Lexington, KY 40546 USA. [Baskin, J. M.] Univ Kentucky, Dept Biol, Lexington, KY 40506 USA. Wang, YR (reprint author), Lanzhou Univ, Coll Pastoral Agr Sci & Technol, Key Lab Grassland Agroecosyst, State Key Lab Grassland Agroecosyst,Minist Agr, Jiayuguanxilu 768, Lanzhou 730020, Peoples R China. zengyj@lzu.edu.cn; yrwang@lzu.edu.cn
ISSN 0140-1963
ISBN 0140-1963
29-Character Source Abbreviation J. Arid. Environ.
Publication Date Jan-Feb
Year Published 2014
Volume 100
Beginning Page 89-92
Digital Object Identifier (DOI) 10.1016/j.jaridenv.2013.10.010
Unique Article Identifier WOS:000328716600011
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