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Articles by M.T. Sakr
Total Records ( 3 ) for M.T. Sakr
  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.
  M.T. Sakr and M.A. El-Metwally
  Two field experiments were carried out during the two growing seasons (2005/2006; 2006/2007) to investigate the role of some plant antioxidant materials such as ascorbic acid, glutathione, α-tocopherol and spermine in alleviating the harmful effects caused by soil salt levels (3840 and 6080 mg L-1) on wheat plant. The grains were pre-soaked then the plants sprayed with any of antioxidants used. Moreover, the data showed that 6080 mg L-1 soil salt level alone or in combination with any of applied antioxidants increased the activity of total peroxidase, ascorbic peroxidase, superoxide dismutase and catalase in wheat leaves. In addition, salinity level (6080 mg L-1) alone or in combination with any of applied antioxidants increased the endogenous contents of ascorbic acid and glutathione and total phenols but decreased carotenoids. It could be concluded that salt soil stress depressed all of growth parameters and yield components. The data also revealed that the different antioxidants could partially alleviate the harmful effect of salinity stress which reflected on growth and yield of wheat plant.
  M.A. El-Metwally and M.T. Sakr
  Two field experiments were carried out to investigate the role of Spermine (SP) as seed soaking and/or foliar application of K and/or Zn in reducing the harmful effects of charcoal rot caused by Macrophomina phaseolina and damping-off caused by Rhizoctonia solani as well as improving the productivity of sunflower plant in calcareous-saline soil. From five tested locations of Maryout region, Egypt, M. phaseolina and R. solani were isolated from infected plants. Both fungi were pathogenic and cause typical symptoms of damping-off. Macrophomina phaseolina showed to be highly virulent fungus. It gave the highest values of pre- and post-emergence damping-off compared with R. solani. Application of SP+Zn+K increased germination percentage and reduced damping-off by both fungi under greenhouse conditions. Under greenhouse and field conditions, all treatments of SP and/or K and/or Zn significantly reduced the incidence of damping-off disease compared with control treatment. Presoaking of seeds in SP and foliar spraying of K and/or Zn increased most of growth parameters, yield and its components and oil content of seeds, as well as the contents of K, Ca, P and Zn and K/Na ratio, whereas decreased Na concentration. All treatments significantly increased the activity of total peroxidase, ascorbic peroxidase, superoxide dismutase and catalase enzymes in plants, in addition to the improvements in the content of chlorophyll A, chlorophyll B, caroteinoids and total phenols compared with control plants in both seasons. Therefore, application of SP+Zn+K could be recommended to alleviate the harmful effects of damping-off and charcoal rot diseases in calcareous-saline soil by enhancing the tolerance of sunflower plant to these adverse conditions.
 
 
 
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