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Articles by A.A. Arafa
Total Records ( 3 ) for A.A. Arafa
  A.A. Arafa , M.A. Khafagy and M.F. El-Banna
  The effects of exogenously applied glycinebetaine or ascorbic acid (pre-soaking or pre-soaking plus spraying) on the salt-stress induced ultrastructural damages in sorghum seedlings were investigated. The seedlings grown in hydroponic culture containing nutrient solution for 3 weeks treated with NaCl at (0 and 6000 ppm). Salinity induced ultrastructural damages in leaf such as swelling of thylakoids, disintegration of grana stacking and intergrana lamellae, an increase in the number of plastoglobuli and starch grains (number and size), an increase in the number of mitochondria and destruction of mitochondria (few cristae, shortly the cristae long and some mitochondria appeared pale), shrinkage the plasma membrane, formation of the Myelin-Figures from plasma membrane. These damages were alleviated by the pretreatment (pre-soaking or pre-soaking plus spraying) with glycinebetaine at 4000 ppm or ascorbic acid at 100 ppm. It could be concluded that pre-soaking plus spraying with glycinebetaine at 4000 ppm or ascorbic acid at 100 ppm proved to be more effective since it reduced the harmful effect of salinity.
  A.A. Arafa , M.A. Khafagy and M.F. El-Banna
  The effects of exogenously applied glycinebetaine or ascorbic acid (pre-soaking or pre-soaking plus spraying) on the salt-stress induced ultrastructural damages in sweet pepper seedlings were investigated. The seedlings grown in hydroponic culture containing nutrient solution for 4 weeks treated with NaCl at (0 and 6000 ppm). Salinity induced ultrastructural damages in leaf, the most notable changes were swelling of thylakoid membrane, disintegration of grana stacking and intergrana lamellae and showed a wavy configuration, increase the number of plastoglobuli and starch grains (number and size), mitochondria swelling, the number of mitochondria cristae was decreased (absent or often very short) and the cristae were observed only on one side of the bowl, but on the other side consisted of two membranes of the envelope and separated by a thin matrix layer. Moreover, the thickness of cell wall and the vacuolar volume or sizes were also increased as well as formation of the Myelin-Figures from plasma membrane. These damages were alleviated by the pretreatment with glycinebetaine or ascorbic acid (pre-soaking or pre-soaking plus spraying) at certain concentrations.
  M.T. Sakr and A.A. Arafa
  In this study, two field experiments were carried out during the two growing seasons (2005-2006 and 2006-2007) to investigate the role of some applied antioxidants (spermine 10 mg L-1 and ascorbic acid 200 mg L-1) in counteracting the harmful effect of soil salinity stress (10.1 or 14.6 dS m-1) on canola plants. Growth characters, yield and its components as well as biochemical constituents were studied in the two growing seasons. The results showed that all growth characters including; plant height, leaves number and area/plant, shoot and root dry weight as well as yield and its components including; fruit number/plant, number of fruiting branches, seed number/fruit, seed yield/plant and seed oil content of canola plant were decreased with increasing soil salt level (A2) comparing with (A1). On the other hand, applied antioxidants spermine 10 mg L-1 and ascorbic acid 200 mg L-1) increased growth and yield of canola plant during the two growing seasons. However, the applied antioxidants were more effective under the first soil salt condition (A1) soil salt stress levels (A2) decreased each of photosynthetic pigments, K and P contents, while increased proline, soluble sugar, ascorbic acid, Na and Cl contents compared with (A1). On the other hand, applied antioxidants increased each of photosynthetic pigments, proline, soluble sugar, N, K and P contents, while decreased Na and Cl contents in canola plant under soil salt stress (A1 and A2) during the two growing seasons. It could be concluded that applied antioxidants could counteract the harmful effect of salt soil stress on growth, yield and biochemical constituents of canola plant.
 
 
 
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