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Publication Type J
Authors Debez, A., W. Chaibi and S. Bouzid
Title Effect of NaCl and growth regulators on germination of Atriplex halimus L
Source Cahiers Agricultures
Abstract Germination of Atriplex halimus L. was studied using seeds collected from two different regions of Tunisia (Amilcar, a littoral locality close to Tunis and El Alam, in the centre). Germination was maximal in distilled water, either for intact or scarified seeds, but decreased as NaCl concentrations in the medium increased (complete inhibition at 20 g/l NaCl for seeds originating from El Alam and 40 g/l for seeds from Amilcar). Scarification increased germination under saline conditions, but not in distilled water. Salinity is known to affect germination through a combination of osmotic and ionic toxicity effects. When intact seeds were transferred to distilled water after a 7-day saline treatment, the recovery of germination was similar or slightly reduced in comparison to that in distilled water. Exposure to salinity, therefore, did not affect seed viability since the inhibitory effect of NaCl on germination is reversible, and, hence, osmotic. Scarified seeds appeared to lose their viability from 20 g/l NaCl, suggesting a toxic effect of the salt. It is thought that the depressive effect of salinity on germination could be related to a decline in endogenous levels of hormones such as gibberellic acid (GA) or kinetine. Exogenous application of these growth regulators at 28.8 pmol/l and 46.6 mumol/l for GA3 and kinetine, respectively, during germination significantly enhanced the germination rates of intact or scarified seeds of both origins up to 40 g/l NaCl, but seemed ineffective in increasing the length of 7 day-old seedlings. It is, thus, possible to alleviate the inhibitory effect of NaCl on germination by adding growth regulators.
Author Address Chaibi, W.; Laboratoire de Physiologie Vegetale, Faculte des Sciences de Tunis, Campus Universitaire, 1060, Tunis, Tunisia
ISSN 1166-7699
ISBN 1166-7699
Publication Date Mars-Avril
Year Published 2001
Volume 10
Issue 2
Beginning Page 135-138
Unique Article Identifier BCI:BCI200100312668
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