Botany Department, Agricultural and Biological Research Division
National Research Centre, Giza, EG
Ain Shams University Faculty of Science: Cairo, Ain Shams, EG
1998 to 2010 | PhD (Botany)Education
Zagazig University Faculty of Science: Zagazig, Zagazig, EG
1993-06-12 to 1997-04-14 | M. Sc (Botany )Education
Cairo University Faculty of Science: Cairo, Giza, EG
1986 to 1990-05 | B. Sc. (Botany)Education
Plant physiology, plant Biochemistry
Plant Growth and Yield under stress conditions
Mervat Shamoon Sadak Springer Science and Business Media LLC
AbstractArbuscular mycorrhizal fungi (AMF) have a key role in natural and agricultural ecosystems affecting plant nutrition, soil biological activity and modifying the availability of nutrients. Thiamine (Vitamin B1) is an essential coenzyme which incorporated in a wide range of plant metabolic processes. Thus, this research aimed to study the possibility of mitigating the negative effect of salinity stress on white lupine plant via using AMF and Vit B1 through assessment growth, various physiological traits and yield components of the white lupine plant. AMF was added to the soil (0.0 and 7 g pot−1) and Vit B1was foliar applied to white lupine seedlings (0.0, 100 and 200 mgL−1) and watered by two levels of salinity (0.0 or 5000 mgL−1). Salinity stress (5000 mgL−1) resulted in significant reductions in growth photosynthetic pigments constituents, endogenous indole acetic acid (IAA), some elements & productivity of white lupine in comparison to control plants. While, increasing phenols, some osmolytes and sodium compared to control (plants irrigated by tap water). Adding AMF to soil with the recommended dose boosted white lupine growth, certain physiological aspects and productivity in white lupine plants under irrigation with saltwater (5000 mgL−1). Furthermore, exogenous Vit B1 treatment with 100 & 200 mgL−1 not only enhanced growth and seeds productivity of white lupine plants under normal irrigation but also, improved salinity tolerance by increasing white lupine growth and productivity via inmproving photosynthetic pigments, osmolytes levels and element contents compared to their corresponding controls. Finally it could be concluded that, 200 mgL−1Vit B1 wit AMF treatment shows superiority in inducing maximum improving white lupine plant salinity tolerance.
Nada A. El-Taweel, Mervat Sh. Sadek, and Noha S. Khalifa Egypts Presidential Specialized Council for Education and Scientific Research
Wael M. Semida, Taia A. Abd El-Mageed, Mohammed A. H. Gyushi, Shimaa A. Abd El-Mageed, Mostafa M. Rady, Abdelsattar Abdelkhalik, Othmane Merah, Ayman El Sabagh, Ibrahim M. El-Metwally, Mervat Sh. Sadak,et al. MDPI AG
Water and salt stresses are among the most important global problems that limit the growth and production of several crops. The current study aims at the possibility of mitigating the effect of deficit irrigation of common bean plants growing in saline lands by foliar spraying with selenium via the assessment of growth, productivity, physiological, and biochemical measurements. In our study, two field-based trials were conducted in 2017 and 2018 to examine the influence of three selenium (Se) concentrations (0 (Se0), 25 (Se25), and 50 mg L−1 (Se50)) on common bean plants grown under full irrigation (I100 = 100% of the crop evapotranspiration; ETc) and deficit irrigation (I80 = 80% of ETc, and I60 = 60% of ETc). Bean plants exposed to water stress led to a notable reduction in growth, yield, water productivity (WP), water status, SPAD value, and chlorophyll a fluorescence features (Fv/Fm and PI). However, foliar spraying of selenium at 25 or 50 mg L−1 on stressed bean plants attenuated the harmful effects of water stress. The findings suggest that foliage application of 25 or 50 mg L−1 selenium to common bean plants grown under I80 resulted in a higher membrane stability index, relative water content, SPAD chlorophyll index, and better efficiency of photosystem II (Fv/Fm, and PI). Water deficit at 20% increased the WP by 17%; however, supplementation of 25 or 50 mg L−1 selenium mediated further increases in WP up to 26%. Exogenous application of selenium (25 mg L−1 or 50 mg L−1) to water-stressed bean plants elevated the plant defense system component, given that it increased the free proline, ascorbic acid, and glutathione levels, as well as antioxidant enzymes (SOD, APX, GPX, and CAT). It was concluded that the application of higher levels (25 or/and 50 mg L−1) of Se improves plant water status as well as the growth and yield of common beans cultivated in saline soil.
Gehan Sh Bakhoum, M.M. Tawfik, M.O. Kabesh, and Mervat Sh Sadak Elsevier BV
Mervat Shamoon Sadak and Mona Gergis Dawood Springer Science and Business Media LLC
Rania Samy Hanafy and Mervat Shamoon Sadak Springer Science and Business Media LLC
AbstractDrought stress is an unavoidable challenge limiting plant production and quality. Stigmasterol is a potential compound for plant protection and improvement productivity under drought. Thus, the effects of using stigmasterol as exogenous treatment on improving growth and productivity of sunflower grown under drought were studied. A pot experiment was carried out at two summer seasons, using foliar treatment of stigmasterol 0, 100, 200, and 300 mg L−1 on sunflower plants under different irrigation levels 80% and 50% water irrigation requirement (WIR). Drought stress (50% WIR) provoked significant reductions in growth and yield components; the percentages of decrease in head diameter reached 26.55%, head circumference 26.05%, seed weight per plant 36.26%, and 100 seed weight 29.61%, via decreasing photosynthetic pigments and indole acetic acid while elevating hydrogen peroxide (H2O2), lipid peroxidation (MDA), membrane leakage, lipoxygenase activity, some antioxidant compounds, enzymes, and osmolytes. Stigmasterol has a promotive effect on growth and productivity of sunflower through improving photosynthetic pigments, indole acetic acid, non-enzymatic, enzymatic antioxidant, and osmolytes, while it decreased membrane leakage, H2O2, and MDA, thus, improving yield quality. Moreover, stigmasterol improves the economic importance of sunflower seed oil. About 200 mg L−1 of stigmasterol was the most effective concentration in improving yield parameters, as it causes 19.84% and 25.29% in seed weight per plant and 26.72% and 33.95% of 100 seed weight under 80% and 50% WIR, respectively. Stigmasterol improved growth and productivity of sunflower under normal water conditions and could overcome the reduced impact of drought by improving growth and development and different physiological attributes.
Mervat Sh Sadak, Rania S. Hanafy, Fatma M. A. M. Elkady, Asmaa M. Mogazy, and Magdi T. Abdelhamid MDPI AG
One of the main environmental stresses that hinder crop development as well as yield is salt stress, while the use of signal molecules such as calcium (Ca) has a substantial impact on reducing the detrimental effects of salt on different crop types. Therefore, a factorial pot experiment in a completely randomized design was conducted to examine the beneficial role of Ca (0, 2.5, and 5 mM) in promoting the physiological, biochemical, and growth traits of the wheat plant under three salt conditions viz. 0, 30, and 60 mM NaCl. Foliar application of Ca increased the growth of salt-stressed wheat plants through increasing photosynthetic pigments, IAA, proline, and total soluble sugars contents and improving antioxidant enzymes in addition to non-enzymatic antioxidants glutathione, phenol and flavonoids, β-carotene, and lycopene contents, thus causing decreases in the over-accumulation of free radicals (ROS). The application of Ca increased the activity of antioxidant enzymes in wheat plants such as superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT), which scavenge reactive oxygen species (ROS) and relieved salt stress. An additional salt tolerance mechanism by Ca increases the non-antioxidant activity of plants by accumulating osmolytes such as free amino acids, proline, and total soluble sugar, which maintain the osmotic adjustment of plants under salinity stress. Exogenous Ca application is a successful method for increasing wheat plants’ ability to withstand salt stress, and it has a considerable impact on the growth of wheat under salt stress.
Mervat Sadak, Hala El-Bassiouny, Sherin Mahfouz, Magda El-Enany, and Tarek Elewa Egypts Presidential Specialized Council for Education and Scientific Research
M. S. Sadak, B. A. Bakry, T. M. Abdel-Razik, and R. S. Hanafy FapUNIFESP (SciELO)
Abstract Two field experiments were conducted during 2019 and 2020 summer seasons at the experimental station of national research center, Al-Nubaryia district, El-Behaira Governorate, Egypt, to study the effect of Phenyl alanine and Aspartic acid foliar fertilizers at rates of (0.0, 50, 75 and 100 ppm) on morphological characters, photosynthetic pigments, seed yield and its components as well as seed quality of groundnut grown under sandy soil. Results indicated superiority of aspartic acid over phenyl alanine on increasing different growth parameters, chlorophyll b, biological and seed yields/plant, biological, seed and oil yields (kg/fed.), % of carbohydrate in peanut seeds. Meanwhile, phenyl alanine was superior on increasing carotenoids, indole acetic acid, phenolics, free amino acids, flavonoids, Lycopene, β-Carotene contents, antioxidant activity expressed as (1,1-diphenyl-2-picrylhydrazyl DPPH %) and shilling percentage. In addition, aspartic acid and phenyl alanine with various levels caused significant increases in growth and seed yield quantity and quality of peanut plants through increases in photosynthetic pigments, indole acetic acid, phenolics and free amino acids contents. Aspartic acid was more effective than phenyl alanine, Foliar treatment with 100 mg/L aspartic acid increased oil yield (700.36 over 568.05 ton/fed.) and seed yield (1531.98 over 1253.49 kg/fed.). Finally, it can conclude that using aspartic acid and phenyl alanine as foliar treatment improved growth and yield of ground nut plants under sandy soil.
Mervat Sadak, Elham A. Badr, Gehan, and A. Amin Egypts Presidential Specialized Council for Education and Scientific Research
Faten S. A. Zaki, Mahmoud A. Khater, Mohamed E. El-Awadi, Mona G. Dawood, Mervat Sh. Shamoon, Magda A.F. Shalaby, and Karima Gamal M. El-Din Egypts Presidential Specialized Council for Education and Scientific Research
Gehan Bakhoum, Mervat Sadak, and elham Badr ELSayed Egypts Presidential Specialized Council for Education and Scientific Research
Gehan Bakhoum, Gehan, A. Amin, and Mervat Sadak Egypts Presidential Specialized Council for Education and Scientific Research
Ibrahim Mohamed El-Metwally, Mervat Shamoon Sadak, and Hani Saber Saudy Springer Science and Business Media LLC
AbstractSoil not only represents the main supporter for root growth, but also is the supplier of water and nutrients. However, several soils, i.e. sandy soils, do not adequately fulfill the plant growth requirements of the environmental resources. Therefore, it is necessary to compensate, even partially, the lack of these required resources for better plant growth and development. Amino acids could introduce a substantial solution in this respect. Therefore, two field experiments under field conditions were carried out to investigate the effect of glutamic (GLA) and 5‑aminolevulinic (ALA) acids on photosynthesis pigments, oxidative defense indicators as well as yield and seed quality of peanut. Three concentrations of glutamic acid (10, 20 and 40 mg L−1, denoted GLA10, GLA20, and GLA40, respectively) and three concentrations of 5‑aminolevulinic acid, (10, 20 and 40 mg L−1, abbreviated to ALA10, ALA20, and ALA40, respectively), in addition to a check treatment (tap water) were applied. Treatments were arranged in a randomized complete block design with three replicates. Findings exhibited potentiality of GLA20 treatment for recording the highest values of chlorophyll a, chlorophyll b, chlorophyll a/b, carotenoids and total pigments compared to the other treatments. The increases in indole acetic acid, phenolics and free amino acids were 68.1, 58.9 and 19.6% as well as 64.6, 51.2 and 17.7%, due to application of GLA20 and ALA20, respectively. Substantial improvements in pod yield ha−1, oil %, flavonoids and antioxidant activity were obtained with GLA20 or ALA20. In conclusion, since glutamic or 5‑aminolevulinic acids at concentration of 20 mg L−1 showed promotive effect on physiological and biochemical status of peanut, such amino acids should be adopted as a promising practice in peanut cultivations.
Mervat Sadak Egypts Presidential Specialized Council for Education and Scientific Research
Mervat Sh Sadak, Agnieszka Sekara, Ibrahim Al-ashkar, Muhammad Habib-ur-Rahman, Milan Skalicky, Marian Brestic, Ashwani Kumar, Ayman El Sabagh, and Magdi T. Abdelhamid Frontiers Media SA
Salinity is the primary environmental stress that adversely affects plants’ growth and productivity in many areas of the world. Published research validated the role of aspartic acid in improving plant tolerance against salinity stress. Therefore, in the present work, factorial pot trials in a completely randomized design were conducted to examine the potential role of exogenous application of aspartic acid (Asp) in increasing the tolerance of wheat (Triticum aestivum L.) plants against salt stress. Wheat plants were sown with different levels of salinity (0, 30, or 60 mM NaCl) and treated with three levels of exogenous application of foliar spray of aspartic acid (Asp) (0, 0.4, 0.6, or 0.8 mM). Results of the study indicated that salinity stress decreased growth attributes like shoot length, leaf area, and shoot biomass along with photosynthesis pigments and endogenous indole acetic acid. NaCl stress reduced the total content of carbohydrates, flavonoid, beta carotene, lycopene, and free radical scavenging activity (DPPH%). However, Asp application enhanced photosynthetic pigments and endogenous indole acetic acid, consequently improving plant leaf area, leading to higher biomass dry weight either under salt-stressed or non-stressed plants. Exogenous application of Asp, up-regulate the antioxidant system viz. antioxidant enzymes (superoxide dismutase, peroxidase, catalase, and nitrate reductase), and non-enzymatic antioxidants (ascorbate, glutathione, total phenolic content, total flavonoid content, beta carotene, lycopene) contents resulted in declined in reactive oxygen species (ROS). The decreased ROS in Asp-treated plants resulted in reduced hydrogen peroxide, lipid peroxidation (MDA), and aldehyde under salt or non-salt stress conditions. Furthermore, Asp foliar application increased compatible solute accumulation (amino acids, proline, total soluble sugar, and total carbohydrates) and increased radical scavenging activity of DPPH and enzymatic ABTS. Results revealed that the quadratic regression model explained 100% of the shoot dry weight (SDW) yield variation. With an increase in Asp application level by 1.0 mM, the SDW was projected to upsurge through 956 mg/plant. In the quadratic curve model, if Asp is applied at a level of 0.95 mM, the SDW is probably 2.13 g plant-1. This study concluded that the exogenous application of aspartic acid mitigated the adverse effect of salt stress damage on wheat plants and provided economic benefits.
Mervat Sadak Egypts Presidential Specialized Council for Education and Scientific Research
Mervat Sh Sadak and Gehan Sh Bakhoum Elsevier BV
Mervat Sadak, Aboelfetoh Abdalla, Ebtihal Abd Elhamid, and Mohamed Ezo Egypts Presidential Specialized Council for Education and Scientific Research
Mervat Sadak, Gehan Bakhoum, and Medhat Tawfic Egypts Presidential Specialized Council for Education and Scientific Research
Mervat Sh Sadak, Medhat M. Tawfik, and Gehan Sh Bakhoum Elsevier
M. El Karaman, Mervat Sadak, Gehan Bakhoum, Hamed Omer, and Bakry Bakry Science Alert
Mervat Sh. Sadak, Bakry Ahmed Bakr, and Mohamed Farouk El- Science Alert
Bakry Ahmed Bakr, Mervat Sh. Sadak, Abd El-Samad Mahmoud Yo, and Tamer M. Abd El-Raz Science Alert