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Publication Type J
Authors El Keblawy, A., S. S. Al Neyadi, M. V. Rao and A. H. Al-Marzouqi
Title Interactive effects of salinity, light and temperature on seed germination of sand dunes glycophyte Cyprus conglomeratus growing in the United Arab Emirates deserts
Source Seed Science and Technology
Author Keywords limonium-stocksii ion accumulation salt tolerance growth chenopodiaceae populations responses dormancy ecophysiology halophytes
Abstract Cyperus conglomeratus is one of the most dominant evergreen plants on the unstable desert sand dunes of the Arabian Gulf region. This study assessed the effects of salinity, temperature and light of incubation, and their interactions on final germination, germination rate and recovery germination of this glycophytic sedge in the UAE deserts. The optimum germination for the non-saline treated seeds was in light and at 30/40 degrees C. Germination in light was significantly greater than in darkness at higher temperatures, but did not differ at lower temperatures. Seeds of C. conglomeratus were very sensitive to salinity. Salinity tolerance depended on both light and temperature of incubation. Salinity tolerance at higher salinity levels was greatest at both higher temperatures and darkness. Germination in light was significantly reduced in 25 mM NaCl and almost inhibited in 50 - 100 mM NaCl but dark germination either significantly increased or was not affected, especially at higher temperatures. No seeds recovered their germination after transfer from saline solutions to distilled water when placed at the lower temperatures, but recovery was observed at higher temperatures. The results are discussed in the light of the adaptive significance of germination behaviour for C. conglomeratus survival and adaptation in deserts.
Author Address [El Keblawy, A] Sharjah Univ, Sharjah Res Acad, Sharjah, U Arab Emirates [El Keblawy, A] Sharjah Univ, Dept Appl Biol, Sharjah, U Arab Emirates [Al Neyadi, SS] UAE Univ, Fac Sci, Dept Biol, Abu Dhabi, U Arab Emirates [Rao, MV] UAE Univ, Dept Chem, Fac Sci, Abu Dhabi, U Arab Emirates [Al-Marzouqi, AH] UAE Univ, Dept Chem & Petr Engn, Fac Engn, Abu Dhabi, U Arab Emirates El Keblawy, A (reprint author), Sharjah Univ, Sharjah Res Acad, POB 27272, Sharjah, U Arab Emirates akeblawy@sharjah.ac.ae
ISSN 0251-0952
ISBN 0251-0952
29-Character Source Abbreviation Seed Sci. Technol.
Year Published 2011
Volume 39
Issue 2
Beginning Page 364-376
Unique Article Identifier WOS:000293158200009
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