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Publication Type J
Authors Rejili, M., A. M. Vadel, A. Guetet, M. Mahdhi, B. Lachiheb, A. Ferchichi and M. Mars
Title Influence of temperature and salinity on the germination of Lotus creticus (L.) from the arid land of Tunisia
Source African Journal of Ecology
Author Keywords arid habitat germination Lotus creticus (L ) osmotic salinity temperature toxicity EARLY SEEDLING GROWTH ZYGOPHYLLUM SIMPLEX SCOTCH THISTLE SEEDS DORMANCY MATURATION RESPONSES DESERT TIME CHENOPODIACEAE
Abstract Effects of salinity, temperature and their interactions on the rate and final percentage of germination were evaluated for two populations (Msarref, Oued dkouk) of the invasive glycophyte Lotus creticus Linne, grown under arid environmental conditions of the Tunisia. Seeds that were not treated with NaCl germinated well in a wide range of temperatures. For both populations, maximum germination occurred in distilled water at 25 degrees C and lowest germination for all salinities was at 35 degrees C. Germination was substantially delayed and significantly reduced with an increase in NaCl to levels above 300 mm. Compared to the Oued dkouk population, final germination and germination rate of the Msarref population was completely inhibited at 300 mm NaCl. The interactive effect of temperature and NaCl concentration on final germination and germination rate was significant (P < 0.01), indicating that the germination response to salinity depended on temperature. The inhibition of Oued dkouk population seed germination at high salt concentration was mostly due to osmotic effects while ionic effects were noted at Msarref population. The germination behaviour of the Oued dkouk population would therefore imply adaptive mechanisms to saline environments, while in the Msarref population such mechanisms seem to be absent. Since seed germination is more sensitive to salinity stress than the growth of established plants, the greater tolerance to salinity of Oued dkouk population would be an adaptive feature of this population to saline environment.Resume L'effet de l'interaction de la salinite et de la temperature sur la germination de deux populations (Msarref et Oued Dkouk) du lotier de crete (Lotus creticus L.), glycophyte poussant dans des conditions environnementales arides en Tunisie, est etudie. Chez les deux populations, le taux de germination le plus eleve est obtenu a 25 degrees C et le plus faible a 35 degrees C. A 300 mm de NaCl, la germination de la population d'Oued Dkouk est ralentie alors que celle de Msarref est completement inhibee. L'effet de l'interaction de deux stress est hautement significatif (P < 0,01). Il semble, ainsi, que l'effet de chacun de deux stress est intensifie par l'autre. Cependant, les deux populations montrent un comportement halophytique different. L'inhibition de la germination, par la salinite, chez Oued Dkouk est due a un effet osmotique alors que chez Mserref, il est ionique. Il en resulte que la population de oued Dkouk presente une capacite adaptative a l'aridite plus importante que celle observee chez la population Msarref.
Author Address [Rejili, Mokhtar; Lachiheb, Belgacem; Ferchichi, Ali] Arid Area Inst IRA, Arid & Oases Cropping Lab, Medenine 4119, Tunisia. [Vadel, Ahmedou M.] Fac Sci, Abiot Stress Lab, Gabes 6011, Tunisia. [Guetet, Arbi] Arid Area Inst, Pastoral Ecol Lab, Medenine 4119, Tunisia. [Rejili, Mokhtar; Mahdhi, Mosbah; Mars, Mohamed] Fac Sci Gabes, Lab Plant Biotechnol Appl Crop Improvement, Erriadh City Zrig 6072, Gabes, Tunisia. Rejili, M, Arid Area Inst IRA, Arid & Oases Cropping Lab, Medenine 4119, Tunisia. rejili_mokhtar@yahoo.fr
ISSN 0141-6707
ISBN 0141-6707
29-Character Source Abbreviation Afr. J. Ecol.
Publication Date Jun
Year Published 2010
Volume 48
Issue 2
Beginning Page 329-337
Digital Object Identifier (DOI) 10.1111/j.1365-2028.2009.01111.x
Unique Article Identifier ISI:000277320000006
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