Browsing by Author "Belkhodja, M."

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Abscisic Acid Effects On Water And Photosynthetic Characteristics Of Two Ecotypes Of Atriplex Halimus L.
(University of Eloued جامعة الوادي, 2016-05-01) Bidai, Y.; Achour, A.; Belkhodja, M.
The aim of this study is to compare the water and photosynthetic characteristics of two xerophilic ecotypes of Atriplex halimus (L.). Seeds collected from two different sites Djelfa and Oran are germinated in controlled greenhouse. After 6 months, the plantlets were treated 21 days with increasing concentrations of abscisic acid (0M, 10-6 M and 10-3 M). The results show that ecotype of Djelfa reduced water loss through transpiration because of high stomatal resistance. Consequently the content of chlorophyll a and b decrease significantly compared to Oran ecotype which show an increase of the osmotic potential and relative water content. Osmotic adjustment to reduce dehydration and maintain a good photosynthesis seems efficient in Oran ecotype.
Effect Of Salt Stress On Some Physiological Parameters In Atriplex Halimus L.
(University of Eloued جامعة الوادي, 2017-01-01) Soualmi, N.; Belkhodja, M.; Adda, A.
The impact of salinity applied for five weeks followed two provenances of Atriplex halimus L. harvested from Oran (Algeria coast) and Ain Dheb (high plateaus west of Algeria). The analyzed parameters are physiological from the leaves of young plants grown in a greenhouse stored in air-conditioned glass. Two types of salt stress are imposed on plants from the 165th day after sowing for a batch CaCl2 + NaCl to 300 meq and 600 meq.l-1and for the other batch to undiluted water sea with a frequency of watering every other two days. The results of water indicators such as the relative water content (RWC or TRE) showed some fluctuation during the five weeks under the two types of stress. Transpiration (water loss from the excised leaf or RWL) measured after 30, 60 and 120 min at the end of the period of application of stress presents a decline in both sources and types of stress. In addition, the stomatal resistance showed considerable variability for both sources and the type of stress.
WATER AND PHYSIOLOGICAL RESPONSES OF OKRA ABELMOSCHUS ESCULENTUS UNDER SALINE STRESS GROWN ON A BENTONIZED SUBSTRATE
(University of Eloued جامعة الوادي, 2017-09-01) Rahim Guealia, H.; Belkhodja, M.; Reguieg, H. Y.; Babou, F. Z.
In many arid and semi-arid regions of the world, Salinity has become an important problem for agricultural production. The objective of this study was to evaluate the effect of different treatments of NaCl (Control, 100 mM and 300 mM) for 7 days, on young okra plants (Abelmoschus esculentus), grown in two types of substrate with (B7%) and without bentonite (SB) under controlled greenhouse conditions. The results showed that the two factors (salinity and bentonite) imposed in our study have a significant effect on the water status estimated by RWC, RWL and DHS in addition of the accumulation of the osmoregulator (proline, soluble sugars).
Water Deficit Effects On Morpho-physiologicals Parameters In Durum Wheat
(University of Eloued جامعة الوادي, 2016-09-01) Chahbar, S.; Belkhodja, M.
Various morpho-physiological characters related to the water deficit (relative water content, rate water loss, stomatal density, stomatal resistance), were studied at five durum wheat genotypes under two hydrous conditions. The relationship between traits and adaptative strategies develops by each genotype have been described. Results obtained show that been present an appreciable variability intraspecific for the morpho-physiological parameters related to the adaptation to the water deficit. Tolerance of this condition has estimated through for relative water content who is explained by morpho-physiological parameters. Finally, the contribution of the morpho-physiological parameters in the adaptation of the durum wheat depends closely on the intensity of the hydrous deficit.