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Articles by Radhouane Chaffai
Total Records ( 4 ) for Radhouane Chaffai
  Radhouane Chaffai , Mohamed Anis Elhammadi , Tini Nouhou Seybou , Ali Tekitek , Brahim Marzouk and Ezzedine El Ferjani
  The fatty acid composition and the polar lipid profiles are examined in maize (Zea mays L., cv. Alistrong) treated with 100 μM Cd. In roots, analysis of fatty acid composition reveals a general pattern of increase in the unsaturation level of most polar lipid classes, as indicated by the Double Bond Index (DBI). The results also include no alteration of total fatty acid, phospholipid (PL) and Steryl Lipid (SL) contents, but glycolipids (GL) were substantially increased. In shoots, the double bond indices of phosphatidylcholine (PC) and phosphatidylglycerol (PG) were decreased, whereas those obtained from MGDG, DGDG and SQDG showed an opposite response. The PG and MGDG content in shoots were markedly decreased by about 78 and 65%, respectively, indicating that the Cd toxicity caused severe damage to the structure and function of photosynthetic membranes. The increase of the malondialdehyde (MDA) content in roots indicates an oxidative stress, which can be involved in mediating compositional membrane alterations.
  Radhouane Chaffai and Ezzedine El Ferjani
  The purpose of the present study was to contribute to the literature on the role of organic acids in Al tolerance in maize (Zea mays L.). Treatment with increasing Al concentrations from 100 to 1000 μM for 4 days Al caused substantial inhibition of lateral roots, as well as severe alterations on root apices. In roots, the malate content was decreased significantly by Al. However, the citrate, lactate and total organic acids were not affected by Al. In shoots, the citrate, tartarate and total organic acids were decreased significantly by 100, 250 and 500 μM Al. However, the succinate was increased by 500 and 1000 μM Al, while that of lactate increased only by 1000 μM Al. Only the highest Al concentration 1000 μM induced exudation of citrate. It is shown that the enhanced citrate exudation induced by Al support the concept that organic acid exudation may be an effective strategy to cope with soil acidity and Al toxicity in maize.
  Radhouane Chaffai , Ali Tekitek and Ezzedine El Ferjani
  Maize seedlings were grown in hydroponic nutrient solutions containing 0, 20, 50, 100, 250, 500 and 1000 μM Al(NO3)3.9H2O. The effect of aluminum on growth parameters and lipid composition of maize organs are studied. The results showed that Al inhibited dramatically root growth. Morphological symptoms characteristic of Al toxicity were observed in roots. The Al reduced significantly the fresh and dry matter production. Analyze of the lipid content showed a decrease in phospholipids in roots and shoots particularly at 1000 μM. Moreover, Al affected glycolipids in roots without any changes in shoots. The steryl lipids did not undergo variations. The increase of SL/PL ratio in roots and shoots point out elevated lipid membrane fluidity under Al stress. All the changes in lipid content were essential to restore optimal membrane properties for continuous growth under Al stress.
  Radhouane Chaffai , Mohamed Anis Elhammadi , Tini Nouhou Seybou , Ali Tekitek and Ezzedine El Ferjani
  Aluminum is solubilized at low pH in acidic soils and is major factor limiting crop productivity in many arable lands in the world. The results indicated that the decrease in root lengths was a function of Al concentration and exposure time. Inhibition of root growth was closely associated to morphological disorders, such as stubby appearance, a large number of short laterals, swelling and deformed root apices. The results of kinetic studies during short (1, 2, 4 and 8 h) or long-term (4 days) of Al exposure (0-1000 μM Al), showed general trend toward decreasing the malate content in roots with increasing Al concentrations and strongly suggest that malate is not involved as Al-chelating ligand in internal Al resistance mechanism. In addition, the root content of citrate was not affected by Al, indicating that citrate might contribute to internal Al detoxification. Malate dehydrogenase was significantly increased during 8 h of Al exposure, while no significant change was observed after 1, 2 and 4 h of Al exposure. By contrast, this activity was significantly decreased in roots after 4 days of Al exposure. Not significant changes were observed with Al exposure, for either roots or shoots, in the activity of NADP-isocitrate dehydrogenase.
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