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Articles by I. El Hadrami
Total Records ( 6 ) for I. El Hadrami
  J. Zouine and I. El Hadrami
  The present study was conducted to determine the effect of three concentrations of usually used (1.5, 3 and 6%) of sucrose on the proliferation of date palm cell suspension culture. The medium containing 3% sucrose, leads to best results than 1.5 and 6% sucrose especially for JHL cultivar. In fact, when sucrose concentration increased from 1.5 to 3%, the embryogenic mass significantly increased from 2.15 to 14.6 g per flask and 8.7 to 10 g per flask, respectively for JHL and BSTN cultivars. The biochemical analysis showed that the maturation medium with 3% sucrose significantly increased the proteins (14.9 mg g-1 FW for JHL cultivar and 5 mg g-1 FW for BSTN cultivar) and sugars contents (22.5 and 22.7 mg g-1 FW, respectively, for JHL and BSTN cultivars) in the embryogenic mass. In addition, as compared to 1.5 and 6%, the use of 3% sucrose enhanced phenolics contents (0.69 mg g-1FW) and peroxidases activities (2.9.103 n Kat g-1FW) in BSTN cultivar.
  A. El Hadrami , M. Belaqziz , M. El Hassni , S. Hanifi , A. Abbad , R. Capasso , L. Gianfreda and I. El Hadrami
  The present study revealed that traditional and industrial OMW samples were mildly acidic (pH= 4.10-4.50) and of a high conductivity of 18 to 56 mS cm-1. The chemical oxygen demand (COD) ranged from about 250 to 600 g L-1 while the biological demand of oxygen (DBO5) was about 3.05 to 3.39 g L-1. The two OMW samples showed also significant differences in contents of many other chemical elements such as sodium, chloride, phosphorus and soluble and bound phenolic compounds. Fertirrigation of some crops from Mediterranean basin (maize, wheat, chickpea and tomato) by various concentrations of OMW showed significant different influences as respect to controls both with regard to the germination and growth stages of the plants. High reduction of shoot and root weight, of ramification and leaf extension rates, accompanied with significant reduction of yield, was observed for all the studied crops, especially wheat. The results were confirmed by significant qualitative and quantitative differences of some stress indicators such as phenolic compounds, peroxidases, chlorophyll contents observed between OMW treated plants and controls. A reduction of chlorophyll contents accompanied with a stimulation of peroxidases activity and phenolic compounds accumulation was recorded for OMW treated plants. The physiological disorders and/or phytotoxicity attributed to the OMW phenolics were highlighted depending on the crops.
  N. Zouiten , A. Hilal and I. El Hadrami
  Euphyllura olivina Costa (Psyllid) is a pest insect causing considerable wastes of crops by provoking the losses of young buds, flower buds and fruits in Olea europaea L. It seems that cultivars influence the oviposition performance of Psyllid. A certain degree of resistance to olive Psyllid in young and flower buds was associated with higher level of phenolic compounds and particularly the level of 3, 4-dihydroxyphenylethanol (3, 4-DHPE). In this study, analysis was performed on the evolution of the level of 3, 4-DHPE in young and flower buds infested or not by Psyllid and the effects of this compound on the oviposition performance and insect mortality on young buds as well as on their phenolic compounds. The infestation by Psyllid decreased the level of 3, 4-DHPE; this reduction is more pronounced in flower buds in comparison with the young buds (83.9 and 20%, respectively, after 30 days of treatment). The treatment with 3, 4-DHPE arrested the oviposition of Psyllid on young buds and induced a higher percentages of the insect mortality. No qualitative or quantitative changes of bud phenolics have been induced with 3, 4-DHPE treatment.
  A. Abbad , A. El Hadrami , I. El Hadrami and A. Benchaabane
  The product of biomass and the accumulation of the inorganic ions of seven Moroccan provenances of Atriplex halimus, treated with different concentrations of NaCl (0, 1, 2, 3 and 3.5%) was carried out. The study has shown a highly significant effect of provenance, salinity and their interaction (provenance x salinity). The production of the most significant biomass was recorded at 1 and 2% NaCl concentrations. High NaCl concentrations (3 and 3.5%) induce a reduction of the biomass. Among all the studied provenances, those Sidi Bouzid and Marrakech have shown the highest values of the biomass. As for the inorganic ions, the increase of salinity have generate an accumulation of Na+ and Cl- with a reduction of K+. This accumulation of the inorganic ions under salt stress was variable between provenances. This variability appears in relation with the polymorphism, which characterize the species. On the seven studied Moroccan provenances, those of Sidi Bouzid and Marrakech have shown a particular eco-physiological behaviour with a significant biomass production under salt stress.
  A. Abbad , A. El Hadrami , I. El Hadrami and A. Benchaabane
  Compared analyses of the chemical composition of the ramets of three natural populations of Atriplex halimus placed in a common garden were carried out. The study showed a significant variability of chemical and nutritive value between the three Moroccan populations originating from three bio-climate contexts (semi arid, arid and saharan). This variability appears within and between populations according to the sampling date. Ramets from Safi (semi arid bio-climate) and Marrakech (arid bio-climate) showed high contents of crud proteins (21.59 to 25.07% and 19.56 to 25.48% during the humid period and 19.12 to 20.64% and 17.42 to 19.94% during the dry period, respectively). As for the total phosphorus contents, the two populations reached 0.12 to 0.17% and 0.12 to 0.19% during the dry period and 0.25 to 0.31% and 0.21 to 0.32% during the humid period, respectively. Lipid matter levels were high during the autumnal period and estimated respectively at 10.14 to 10.87% and 10.27 to 12.66% for the same populations. The highest contents of fiber (acid detergent fiber: ADF), of crud ash, sodium and calcium were observed during the dry period (June, July, August and October). A highly significant negative correlations (P<0.01) were found between crud protein, fibers (ADF), crud ash, sodium, potassium, calcium and iron. Whereas, a highly significant positive correlation (P<0.01) was detected between crud proteins, phosphorus and lipid fraction.
  A. Arfaoui , B. Sifi , M. El Hassni , I. El Hadrami , A. Boudabbous and M. Cherif
  Germinated seeds of two chickpea cultivars ILC482 and INRAT87/1, respectively susceptible and moderately resistant to Fusarium oxysporum f. sp. ciceris (Foc), were preinoculated with a suspension of two Rhizobium isolates PchDMS and Pch43. Three days later, the seedlings were challenged by root dip with a conidial suspension of Foc race 0. The two Rhizobium isolates protected chickpea plants from F. oxysporum infection; the best protection has been obtained by PchDMS for the two cultivars. For the susceptible cultivar, mortality was 12.5 and 33.33% for treated plants, respectively with PchDMS and Pch43 as compared to the 79.16% in the inoculated control with Foc only. For the INRAT87/1 Cv. mortality was 8.33 and 12.5% for treated plants, respectively with PchDMS and Pch43 compared to the 54.16% in the control inoculated treatment. The two Rhizobium isolates stimulated the peroxidases and polyphenoloxidases activities and induced the accumulation of phenolic compounds. The maximum of peroxidases activities in plant roots were reached 24 h after challenging. However, the higher activity of polyphenoloxidases and the higher level of the phenolic compounds were recorded 72 h after Foc inoculation. Comparing the two strains, PchDMS was more effective in inducing enzymes and phenolic compounds and highest levels were recorded in INRAT87/1 cultivar.
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