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Publication Type J
Authors El-Keblawy, A. and N. Al-Shamsi
Title Salinity, temperature and light affect seed germination of Haloxylon salicornicum, a common perennial shrub of the Arabian deserts
Source Seed Science and Technology
Author Keywords zygophyllum simplex growth-regulators plants germinability populations halophytes responses stocksii kuwait flora
Abstract Haloxylon salicornicum (Moq.) Bunge ex Boiss. has been considered as one of the most promising species for reseeding deteriorating desert range vegetation, and for sand dune fixation in the Arabian deserts. However, plant communities dominated by this species have become seriously degraded due to overgrazing. Reseeding degraded communities with this species requires information about light and temperature requirements and salinity tolerance at different temperatures of its seed germination. Seeds were germinated in saline concentrations (up to 800 nM NaCl) in incubators adjusted to 15, 20, 25 and 30 degrees C, in both continuous light and dark. In non-saline treated seeds, germination in light conditions was similar for temperatures up to 25 degrees C, but declined significantly at 30 degrees C. Germination in darkness at either 15 or 20 degrees C was significantly greater than at 25 and 30 degrees C. Both final germination percentage and germination rate decreased as salinity increased. In higher salinity levels (500 - 700 nM), germination at moderate temperatures was greater than at both lower and higher temperatures. Recovery germination decreased as temperature increased. The lower salinity tolerance during germination in H. salicornicum at 15 degrees C was attributed to reversible osmotic effect, but lower salinity tolerance at 30 degrees C was attributed to Na(+) toxicity that usually causes irreversible damage.
Author Address [El-Keblawy, A; Al-Shamsi, N] United Arab Emirates Univ, Fac Sci, Dept Biol, Al Ain, U Arab Emirates [El-Keblawy, A] Suez Canal Univ, Fac Educ Al Arish, Dept Biol, Ismailia, Egypt El-Keblawy, A (reprint author), United Arab Emirates Univ, Fac Sci, Dept Biol, POB 17551, Al Ain, U Arab Emirates a.keblawy@uaeu.ac.ae
ISSN 0251-0952
ISBN 0251-0952
29-Character Source Abbreviation Seed Sci. Technol.
Year Published 2008
Volume 36
Issue 3
Beginning Page 679-688
Unique Article Identifier WOS:000261588500017
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