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Agronomy Research

Selle valdkonna püsiv URIhttp://hdl.handle.net/10492/3351

Sirvi

Sirvi Agronomy Research Autor "Abdalgadir, H." järgi

Nüüd näidatakse 1 - 3 3
  • Pisipilt
    Kirje
    Effects of chemical seed priming on germination performance and seedling growth of Lycopersicon esculentum (Mill.) under salt stress
    (Estonian University of Life Sciences, 2024) Maaroufi-Dguimi, H.; Gamal Mohammed, S.; Abdalgadir, H.; Omari al Zahrani, F.
    As an important economic plant, Lycopersicon esculentum (Mill.) faces salinity stress from germination to all growth stages. The aim of this study is to ride salt-induced agriculture difficulties of tomato by applying different chemical seed priming: ascorbic acid (ASA), potassium nitrate (KNO3) and calcium nitrate (CaNO3) during two time periods which are 24 and 48 hours. In the current case, the seeds were pre-treated with previously mentioned chemicals for varying periods of time before germination in a salt solution (100 mM NaCl). The treatments were replicated three times. For no primed seeds, salt treatment decreased germination parameters as well as seedling growth parameters (fresh weight, epicotyl and root length and chlorophyll content). Different chemical seed priming alleviated the salt harmful effect on germination and growth parameters. In saline conditions, the priming agents, had more significant effect in comparison with normal conditions. Significantly, the treatment including CaNO3-48-h priming, had high efficacy in promoting germination and plant growth and is associated with reduced levels of leaf proline and malondialdehyde (MDA) content.
  • Pisipilt
    Kirje
    Efficiency of seed priming and co-treatment strategies in salt effect mitigation using Nicotiana glauca leaf extract on tomato seedlings (Solanum lycopersicum L.)
    (Estonian University of Life Sciences, 2025) Maaroufi-Dguimi, H.; Gamal Mohammed, S.; Nasraoui Hajaji, A.; Abdalgadir, H.
    The Al-Baha region suffers from soil salinity, negatively impacting agriculture. Current study examined aqueous extracts from Nicotiana glauca as plant-based biostimulants to alleviate salinity's effects and reduce chemical fertilizer use. An aqueous extract of N. glauca, applied in ascending doses of 20%, 50%, and 100%, was being used. This biostimulant was applied using two methods: seed priming and co-treatment on the seeds of Solanum lycopersicum L. Results indicated that all tested doses, whether applied through seed priming or co-treatment, enhanced the final germination percentage (FGP) and reduced the mean germination time (MGT) under saline conditions. With priming, the 20% dose was most effective in reducing salt treatment effects on FGP, improving it by 5% compared to untreated salt-stressed seeds. In co-treatment, the 100% dose showed a 4.5% reduction in FGP decline referring to untreated and stressed seeds. For priming treatments, the 20% dose reduced MGT by 22%, while the 50% dose in co-treatment reduced it by 28% compared to untreated and stressed seeds. The priming strategy used in this study did not result in significant enhancements in growth parameters, particularly in the fresh weight (FW) and dry weight (DW) of the epicotyls. As priming, the 20% dose had the most significant mitigation effect on epicotyl FW, DW and chlorophyll (Chl) content by 15%, 10% and 30% referring to untreated and stressed seedlings, respectively. However, all tested biostimulant doses used as co-treatment proved effective in mitigating the negative effects of salt on epicotyl and root FW, DW, and Chl content. Seedlings treated with various strategies and doses showed a smaller increase in malondialdehyde (MDA) and proline (Pro) levels under salinity stress. As stress indicators, both Pro and MDA levels were significantly reduced when a co-treatment strategy was applied. Furthermore, the results indicated that the effectiveness of the N. glauca aqueous extract in alleviating salt stress could be attributed to its content of several phenolics, flavonoids, and tannins, which possess antioxidant properties that enhance the plant's tolerance against salt-induced oxidative stress.
  • Pisipilt
    Kirje
    Phytochemical screening and evaluation of antioxidant and antimicrobial activity of Solanum incanum: medicinal plant from Al-Baha Region
    (Estonian University of Life Sciences, 2026) Mohammed, S.G.; Maaroufi Dguimi, H.; Bashir, S.H.; Tammam, S.A.; Abdalgadir, H.; Howladar, S.M.; Alzahrani, F.O.
    Solanum incanum is a prominent medicinal plant, used to treat various ailments. The current study sought to assess the phytochemical profile, as well as the antioxidant and antimicrobial activities, of the crude methanolic extract and the corresponding chloroform, ethyl acetate, n-hexane, and aqueous fractions of the leaves, stem bark, and fruits. Leaf and fruit extracts had the largest levels of polyphenols, flavonoids, tannins, and alkaloids referring to stem-bark. Hexadecanoic acid methyl ester is a major phytochemical component revealed in different plant parts, especially in stem-bark with 31.82% level. The 9,12,15-Octadecatrienoic acid, methyl ester is also revealed in all plant parts, especially in leaf with 20.07%. Fruit and leaf ethyl acetate and water fractions showed the highest antioxidant capacity compared to stem-bark fractions. Using the agar disc diffusion method, antimicrobial activity was evaluated in vitro against four different bacterial species and one fungal species (Candida albicana). The ethyl acetate, n-hexane, and chloroform fractions of fruits and leaves showed strong antimicrobial activity against all microorganisms. Aqueous fraction of different plant parts was inactive or partially active against tested microorganisms. The high total content of phenols, flavonoids, tannins and alkaloids, especially in leaves and fruits, correlates positively with the highest antimicrobial and antioxidant activities detected in these parts of the plant.