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Publication Type J
Authors Khan, M. A. and S. Gulzar
Title Light, salinity, and temperature effects on the seed germination of perennial grasses
Source American Journal of Botany
Language English
Author Keywords Aeluropus lagopoides germination of halophytes Halopyrum mucronatum Karachi, Pakistan light, salinity, and temperature Sporobolus ioclados Urochondra setulosa Plant Sciences
Abstract The germination requirements of four perennial halophytic grasses, Aeluropus lagopoides, Halopyrum mucronatum, Sporobolus ioclados, and Urochondra setulosa, were studied under control conditions in the laboratory. Treatments included two light levels (12 : 12 h light : dark period and 24-h dark environment), six salinity concentrations (0, 100, 200, 300, 400, and 500 mmol/L NaCl), and four temperature regimes (fluctuating day.: night temperature regimes of 10degrees : 20degrees, 15degrees : 25degrees, 20degrees : 30degrees and 25degrees : 35degreesC), using a completely randomized block design. Best seed germination of all grasses was obtained in a distilled water control. Increase in salinity progressively inhibited germination of all species. For example, few seeds of H. mucronatum germinated above 300 mmol/L NaCl, while seeds of the other grasses germinated in up to 500 mmol/L NaCl. Optimal temperature regime for germination for all species was 20degrees : 30degreesC both for light- and dark-germinated seeds. At higher temperatures differences between light and dark treatments were not significant. Absence of light had no effect on the seed germination of U. setulosa and H. mucronatum; however, germination was lower in all salinity treatments. In the case of A. lagopoides, absence of light substantially inhibited the germination both in control and saline conditions. The light effect was marked in the case of S. ioclados, which showed very low germination in the absence of light both under saline and nonsaline conditions.
Author Address Univ Karachi, Dept Bot, Karachi 75270, Pakistan. Khan, MA (reprint author), Univ Karachi, Dept Bot, POB 8452, Karachi 75270, Pakistan.
ISSN 0002-9122
ISBN 0002-9122
29-Character Source Abbreviation Am. J. Bot.
Publication Date Jan
Year Published 2003
Volume 90
Issue 1
Beginning Page 131-134
Digital Object Identifier (DOI) 10.3732/ajb.90.1.131
Unique Article Identifier WOS:000183132800015
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