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Browsing by Author Sadak, Mervat Sh.

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  • Attenuation of negative effects of saline stress in wheat plant by chitosan and calcium carbonate

    • Authors: Sadak, Mervat Sh.;  Advisor: -;  Participants: Talaat, Iman M. (2021)

  • Chitosan and Ca+ are natural signal molecules that can be used in agriculture as biostimulants and elicitors. They enhance different physiological responses and mitigate the negative effects of salinity. So, this investigation was done to study the effect of soaking wheat grains in chitosan and CaCO3 (20 and 40 mg/L) on alleviating the adverse effect of salinity stress (0.0 and 5000 mg/L) on growth, some biochemical and physiological and yields of wheat plant.
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  • Physiological and biochemical responses of soybean (Glycine max L.) to cysteine application under sea salt stress

    • Authors: Sadak, Mervat Sh.;  Advisor: -;  Participants: Abd El-Hameid, Asmaa R.; Zaki, Faten S. A.; Dawood, Mona G.; El-Awadi, Mohamed E. (2020)

  • Cysteine treatments could alleviate the adverse effect of salinity stress on growth and yield of soybean plant through increasing photosynthetic pigments; proline content; N, P, and K contents; superoxide dismutase and catalase activities; and oil% accompanied by decreases in H2O2 and MDA contents as compared with their corresponding controls. In addition, cysteine treatments and/or salinity stress exhibited differences in protein pattern from 112 to 19 kD molecular weight. The appearance of new protein bands reflected the expression of cysteine treatments and salinity stress.
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  • Role of melatonin in improving growth, yield quantity and quality of Moringa oleifera L. plant under drought stress

    • Authors: Sadak, Mervat Sh.;  Advisor: -;  Participants: Abdalla, Aboelfetoh M.; Abd Elhamid, Ebtihal M.; Ezzo, M. I. (2020)

  • Subjecting M. oleifera plant to drought stress caused significant decreases in growth, photosynthetic pigment, indole acetic acid (IAA), element contents, yield, and yield attributes, meanwhile increased lipid peroxidation is expressed as malondialdehyde (MDA) and various antioxidant enzymes as superoxide dismutase (SOD), catalase (CAT), and peroxidase (POX). On the other hand, foliar treatment with different concentrations of melatonin significantly increased growth parameters, yield quantity, and quality of M. oleifera plant at normal and drought-stressed conditions via improving photosynthetic pigments (IAA), phenolic and element contents, and antioxidant enzyme systems, whereas de...