15 results on '"El‐Sawah, Ahmed M."'
Search Results
2. Funneliformis constrictum modulates polyamine metabolism to enhance tolerance of Zea mays L. to salinity
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El-Sawah, Ahmed M., Abdel-Fattah, Ghada G., Holford, Paul, Korany, Shereen Magdy, Alsherif, Emad A., AbdElgawad, Hamada, Ulhassan, Zaid, Jośko, Izabela, Ali, Basharat, and Sheteiwy, Mohamed S.
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- 2023
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3. The Mode of Integration Between Azotobacter and Rhizobium Affect Plant Growth, Yield, and Physiological Responses of Pea (Pisum sativum L.)
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Ibrahim, Heba M. and El-Sawah, Ahmed M.
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- 2022
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4. Increasing atmospheric CO2 differentially supports arsenite stress mitigating impact of arbuscular mycorrhizal fungi in wheat and soybean plants
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AbdElgawad, Hamada, El-Sawah, Ahmed M., Mohammed, Afrah E., Alotaibi, Modhi O., Yehia, Ramy S., Selim, Samy, Saleh, Ahmed M., Beemster, Gerrit T.S., and Sheteiwy, Mohamed S.
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- 2022
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5. Investigating the Endophyte Actinomycetota sp. JW0824 Strain as a Potential Bioinoculant to Enhance the Yield, Nutritive Value, and Chemical Composition of Different Cultivars of Anise (Pimpinella anisum L.) Seeds.
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Mahmoud, Ahmed M., Reyad, Ahmed M., Khalaf, Maha H., Sheteiwy, Mohamed S., Dawood, Mona F. A., El-Sawah, Ahmed M., Shaban Ahmed, Enas, Malik, Abdul, Al-Qahtani, Wahidah H., Abdel-Maksoud, Mostafa A., Mousa, Nermien H. S., Alyafei, Mohammed, and AbdElgawad, Hamada
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SECONDARY metabolism ,ESSENTIAL oils ,METABOLITES ,AGRICULTURE ,SEED yield - Abstract
Simple Summary: Anise seeds offer nutritional and therapeutic benefits that are valuable to both animal and human health. This study investigated the ability of the endophytic Actinomycetota sp. JW0824 strain to biofortify anise seeds from Egypt, Tunisia, Syria, and Morocco. In this study, significant increases in the dry weight of seeds and oil yields were observed, along with enhancements in the levels of primary and secondary metabolites such as sugars, flavonoids, alkaloids, phenols, vitamins, and essential oils. The number of essential oil metabolic enzymes (PAL and DAHPS) was also consistently increased. The findings suggest that Actinomycetota sp. JW0824 could be used to enhance the yield and quality of anise seeds. Anise (Pimpinella anisum L.) seeds have various nutritional and therapeutic benefits and are thus considered a valuable addition to animal and human health. Hence, in this study, we aimed to induce the nutritive and biological value of anise seeds. To this end, the potential biofortification effect of the endophytic Actinomycetota sp. JW0824 strain, isolated during the fall of 2023 from the medicinal plant Achyranthes aspera, exhibiting natural distribution in the Jazan region of Saudi Arabia, was investigated in four varieties of anise seeds from Egypt, Tunisia, Syria, and Morocco. Results revealed significant increments (p < 0.05) in the seed dry weight percentage (DW%) and oil yields. In line with increased biomass accumulation, the metabolism of the primary and secondary metabolites was increased. There were differential increases in proteins, sugars, flavonoids, alkaloids, phenols, vitamins (e.g., β-carotene, ascorbic acid), and essential oil components (e.g., phenylpropanoids and monoterpenes), along with their precursor phenylalanine. Consistently, the activity of L-phenylalanine aminolyase (PAL) was increased in the Egyptian and Tunisian varieties at 83.88% and 77.19%, respectively, while 3-deoxy-D-arabino-heptulosonate-7-phosphate synthase (DAHPS) activity increased in all varieties, with a significant 179.31% rise in the Egyptian variety. These findings highlight the beneficial effects of Actinomycetota sp. JW0824 as a bioinoculant for anise seeds, suggesting its potential application in agricultural practices to improve seed yield and quality. Further field trials are recommended to assess the commercial viability of this endophyte for enhancing anise seed production and potentially benefiting other plant species. [ABSTRACT FROM AUTHOR]
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- 2024
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6. Drought-Tolerant Bacteria and Arbuscular Mycorrhizal Fungi Mitigate the Detrimental Effects of Drought Stress Induced by Withholding Irrigation at Critical Growth Stages of Soybean (Glycine max , L.).
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Nader, Aya Ahmed, Hauka, Fathi I. A., Afify, Aida H., and El-Sawah, Ahmed M.
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VESICULAR-arbuscular mycorrhizas ,MICROBIAL inoculants ,SOYBEAN ,DROUGHTS ,CLIMATE change ,POLYETHYLENE glycol ,FUNGAL colonies - Abstract
Considering current global climate change, drought stress is regarded as a major problem negatively impacting the growth of soybeans, particularly at the critical stages R3 (early pod) and R5 (seed development). Microbial inoculation is regarded as an ecologically friendly and low-cost-effective strategy for helping soybean plants withstand drought stress. The present study aimed to isolate newly drought-tolerant bacteria from native soil and evaluated their potential for producing growth-promoting substances as well as understanding how these isolated bacteria along with arbuscular mycorrhizal fungi (AMF) could mitigate drought stress in soybean plants at critical growth stages in a field experiment. In this study, 30 Bradyrhizobium isolates and 30 rhizobacterial isolates were isolated from the soybean nodules and rhizosphere, respectively. Polyethylene glycol (PEG) 6000 was used for evaluating their tolerance to drought, and then the production of growth promotion substances was evaluated under both without/with PEG. The most effective isolates (DTB4 and DTR30) were identified genetically using 16S rRNA gene. A field experiment was conducted to study the impact of inoculation with DTB4 and DTR30 along with AMF (Glomus clarum, Funneliformis mosseae, and Gigaspora margarita) on the growth and yield of drought-stressed soybeans. Our results showed that the bioinoculant applications improved the growth traits (shoot length, root length, leaf area, and dry weight), chlorophyll content, nutrient content (N, P, and K), nodulation, and yield components (pods number, seeds weight, and grain yield) of soybean plants under drought stress (p ≤ 0.05). Moreover, proline contents were decreased due to the bioinoculant applications under drought when compared to uninoculated treatments. As well as the count of bacteria, mycorrhizal colonization indices, and the activity of soil enzymes (dehydrogenase and phosphatase) were enhanced in the soybean rhizosphere under drought stress. This study's findings imply that using a mixture of bioinoculants may help soybean plants withstand drought stress, particularly during critical growth stages, and that soybean growth, productivity, and soil microbial activity were improved under drought stress. [ABSTRACT FROM AUTHOR]
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- 2024
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7. Physiological and biochemical responses of soybean plants inoculated with Arbuscular mycorrhizal fungi and Bradyrhizobium under drought stress
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Sheteiwy, Mohamed S., Ali, Dina Fathi Ismail, Xiong, You-Cai, Brestic, Marian, Skalicky, Milan, Hamoud, Yousef Alhaj, Ulhassan, Zaid, Shaghaleh, Hiba, AbdElgawad, Hamada, Farooq, Muhammad, Sharma, Anket, and El-Sawah, Ahmed M.
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- 2021
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8. Metabolic Profiling Analysis Uncovers the Role of Carbon Nanoparticles in Enhancing the Biological Activities of Amaranth in Optimal Salinity Conditions.
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Zrig, Ahlem, Hassan, Abdelrahim H. A., Korany, Shereen Magdy, Alsherif, Emad A., Selim, Samy, El-Keblawy, Ali, El-Sawah, Ahmed M., Sheteiwy, Mohamed S., Abideen, Zainul, and AbdElgawad, Hamada
- Abstract
Enhancing the productivity and bioactivity of high-functional foods holds great significance. Carbon nanoparticles (CNPs) have a recognized capacity for boosting both plant growth and the efficacy of primary and secondary metabolites. Furthermore, while salinity diminishes plant growth, it concurrently amplifies the production of phytomolecules. To ensure the robust and sustainable production of nutritious food, it becomes essential to elevate biomolecule yield without compromising plant growth. Here, we assessed the CNPs priming on plant performance and metabolites of the glycophyte amaranth (Amaranthus hypochondriacus) sprouts at the threshold salinity (25 mM NaCl; i.e., salinity that does not reduce growth but enhances the metabolites of that plant). We measured growth parameters, pigment levels, and primary (carbohydrates, amino acids, organic acids, fatty acids) and secondary metabolites (phenolics, flavonoids, tocopherols). CNP priming significantly improved biomass accumulation (fresh and dry weight) and primary and secondary metabolites of amaranth sprouts. Increased photosynthetic pigments can explain these increases in photosynthesis. Enhanced photosynthesis induced carbohydrate production, providing a C source for producing bioactive primary and secondary metabolites. The priming effect of CNPs further enhanced the accumulation of essential amino acids, organic acids, unsaturated fatty acids, tocopherols, and phenolics at threshold salinity. The increase in bioactive metabolites under threshold salinity can explain the CNP priming impact on boosting the antioxidant activities (FRAP, DPPH, anti-lipid peroxidation, superoxide-anion-scavenger, hydroxyl-radical-scavenger, Fe-chelating and chain-breaking activity in aqueous and lipid phases) and antimicrobial activities against Gram-positive and Gram-negative bacteria and fungi. Overall, this study suggested that threshold salinity and CNP priming could be useful for enhancing amaranth sprouts' growth and nutritional quality. [ABSTRACT FROM AUTHOR]
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- 2023
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9. Increasing atmospheric CO₂ differentially supports arsenite stress mitigating impact of arbuscular mycorrhizal fungi in wheat and soybean plants
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Abd Elgawad, Hamada, El-Sawah, Ahmed M., Mohammed, Afrah E., Alotaibi, Modhi O., Yehia, Ramy S., Selim, Samy, Saleh, Ahmed M., Beemster, Gerrit, and Sheteiwy, Mohamed S.
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Chemistry ,fungi ,food and beverages ,Biology - Abstract
Arbuscular mycorrhizal fungi (AMF) are beneficial for the plant growth under heavy metal stress. Such beneficial effect is improved by elevated CO2 (eCO(2)). However, the mechanisms by which eCO(2) improves AMF symbiotic associations under arsenite (As-III) toxicity are hardly studied. Herein, we compared these regulatory mechanisms in species from two agronomical important plant families - grasses (wheat) and legumes (soybean). As-III decreased plant growth (i.e., 53.75 and 60.29% of wheat and soybean, respectively) and photosynthesis. It also increased photorespiration and oxidative injury in both species, but soybean was more sensitive to oxidative stress as indicated by higher H(2)O2 accumulation and oxidation of protein and lipid. eCO(2) significantly improved AMF colonization by increasing auxin levels, which induced high carotenoid cleavage dioxygenase (CCDs) activity, particularly in soybean roots. The improved sugar metabolism in plant shoots by co-application of eCO(2) and As-III allocated more sugars to roots sequentially. Sugar accumulation in plant roots is further induced by AMF, resulting in more C skeletons to produce organic acids, which are effectively exudated into the soil to reduce As-III uptake. Exposure to eCO(2) reduced oxidative damage and this mitigation was stronger in soybean. This could be attributed to a greater reduction in photorespiration as well as a stronger antioxidant and detoxification defence systems. The grass/legume-specificity was supported by principal component analysis, which revealed that soybean was more affected by (AsI)-I-III stress and more responsive to AMF and eCO(2). This study provided a mechanistic understanding of the impact of AMF, eCO(2) and their interaction on As-stressed grass and legume plants, allowing better practical strategies to mitigate As-III phytotoxicity.
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- 2022
10. Inoculation with Bacillus amyloliquefaciens and mycorrhiza confers tolerance to drought stress and improve seed yield and quality of soybean plant.
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Sheteiwy, Mohamed S., Abd Elgawad, Hamada, Xiong, You‐Cai, Macovei, Anca, Brestic, Marian, Skalicky, Milan, Shaghaleh, Hiba, Alhaj Hamoud, Yousef, and El‐Sawah, Ahmed M.
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GIBBERELLINS ,BETAINE ,BACILLUS amyloliquefaciens ,SEED yield ,SEED quality ,DROUGHT tolerance ,SOYBEAN ,PROTEOLYSIS - Abstract
The present study aimed to evaluate the effect of Bacillus amyloliquefaciens and/or Arbuscular Mycorrhizal Fungi (AMF) as natural biofertilizers on biomass, yield, and seed nutritive quality of soybean (Giza 111). The conditions investigated include a well‐watered (WW) control and irrigation withholding at the seed development stage (R5, after 90 days from sowing) (DS). Co‐inoculation with B. amyloliquefaciens and AMF, resulted in the highest plant biomass and yield under WW and DS conditions. The nuclear DNA content analysis suggested that co‐inoculation with B. amyloliquefaciens and AMF decreased the inhibition of drought stress on both the size and granularity of seed cells, which were comparable to the normal level. The single or co‐inoculation with B. amyloliquefaciens and AMF increased the primary metabolites content and alleviated the drought‐induced reduction in soluble sugars, lipids, protein and oil contents. Plant inoculation induced the expression of genes involved in lipid and protein biosynthesis, whereas an opposite trend was observed for genes involved in lipid and protein degradation, supporting the observed increase in lipid and protein content. Plant inoculated with B. amyloliquefaciens showed the highest α‐amylase and β‐amylase activities, indicating improved osmolyte (soluble sugar) synthesis, particularly under drought. Interestingly, single or co‐inoculation further strengthen the positive effect of drought on the antioxidant and osmoprotectant levels, i.e. phenol, flavonoid, glycine betaine contents, and glutathione‐S‐transferase (GST) activity. As a result of stress release, there was a decrease in the level of stress hormones (abscisic acid, ABA) and an increase in gibberellin (GA), trans‐zeatin‐riboside (ZR), and indole acetic acid (IAA) in the seeds of inoculated plants. Additionally, the ATP content, hydrolytic activities of plasma membrane H+‐ATPase, Ca2+‐ATPase, and Mg2+‐ATPase were also increased by the inoculation. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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11. Arbuscular Mycorrhizae Mitigate Aluminum Toxicity and Regulate Proline Metabolism in Plants Grown in Acidic Soil.
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Alotaibi, Modhi O., Saleh, Ahmed M., Sobrinho, Renato L., Sheteiwy, Mohamed S., El-Sawah, Ahmed M., Mohammed, Afrah E., and Elgawad, Hamada Abd
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VESICULAR-arbuscular mycorrhizas ,TOXICOLOGY of aluminum ,ACID soils ,PROLINE metabolism ,PLANT growth ,BIOSYNTHESIS - Abstract
Arbuscular mycorrhizal fungi (AMF) can promote plant growth and induce stress tolerance. Proline is reported to accumulate in mycorrhizal plants under stressful conditions, such as aluminum (Al) stress. However, the detailed changes induced in proline metabolism under AMF–plant symbiosis has not been studied. Accordingly, this work aimed to study how Al-stressed grass (barley) and legume (lotus) species respond to AMF inoculation at growth and biochemical levels. The associated changes in Al uptake and accumulation, the rate of photosynthesis, and the key enzymes and metabolites involved in proline biosynthesis and degradation pathways were studied. Soil contamination with Al induced Al accumulation in tissues of both species and, consequently, reduced plant growth and the rate of photosynthesis, while more tolerance was noticed in lotus. Inoculation with AMF significantly reduced Al accumulation and mitigated the negative impacts of Al on growth and photosynthesis in both species; however, these positive effects were more pronounced in barley plants. The mitigating action of AMF was associated with upregulation of proline biosynthesis through glutamate and ornithine pathways, more in lotus than in barley, and repression of its catabolism. The increased proline level in lotus was consistent with improved N metabolism (N level and nitrate reductase). Overall, this study suggests the role of AMF in mitigating Al stress, where regulation of proline metabolism is a worthy mechanism underlying this mitigating action. [ABSTRACT FROM AUTHOR]
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- 2021
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12. Arbuscular Mycorrhizal Fungus "Rhizophagus irregularis" impacts on physiological and biochemical responses of ryegrass and chickpea plants under beryllium stress.
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Sheteiwy, Mohamed S., El-Sawah, Ahmed M., Korany, Shereen Magdy, Alsherif, Emad A., Mowafy, Amr M., Chen, Ji, Jośko, Izabela, Selim, Samy, and AbdElgawad, Hamada
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VESICULAR-arbuscular mycorrhizas ,RYEGRASSES ,BERYLLIUM ,NITRATE reductase ,CHICKPEA ,POISONOUS plants ,PRINCIPAL components analysis - Abstract
Heavy metals such as beryllium (Be) have been identified as toxic for plants with a negative impact on plant growth. Therefore, there is an urgent need for environmentally friendly techniques to reduce Be toxicity on plant growth and productivity. To this end, arbuscular mycorrhizal fungi (AMF) are widely applied to induce plant growth and stress tolerance. However, how AMF-plant symbiosis can support plants under Be stress has not been studied. Accordingly, we investigated the physiological and biochemical responses of AMF inoculated ryegrass and chickpea plants to Be stress. The associated changes in Be uptake and accumulation, photosynthesis, oxidative stress, carbon and nitrogen metabolism were studied. Soil contamination with Be induced higher Be accumulation, particularly in ryegrass, which consequentially reduced plant growth and photosynthesis. However, photorespiration and oxidative damage (H 2 O 2 accumulation, lipid oxidation, and LOX activity) were increased, mainly in ryegrass. In both plant species, AMF inoculation reduced Be accumulation and mitigated growth inhibition and oxidative damage, but to a more extent in ryegrass. This could be explained by improved photosynthesis as well as the upregulation of osmoprotectants i.e., sucrose and proline biosynthesis pathways. The increase in proline level was consistent with higher nitrogen (N) metabolism as reflected by N level and nitrate reductase. Species-specific responses were recorded and supported by principal component analysis. This study provided insight into the mechanism of AMF's impact on Be-stressed ryegrass and chickpea plants. Hence, the current research suggested that AMF inoculation could be used as a viable strategy to mitigate Be phytotoxicity in ryegrass and chickpea plants. [Display omitted] • Ryegrass was more tolerant than chickpea to Be stress. • Inoculation with AMF reduced Be phytotoxicity and enhanced photosynthesis of both plants. • AMF inoculation reduced Be accumulation and mitigated growth inhibition and oxidative damage. • Sucrose and proline biosynthesis pathways were upregulated under Be stress. • Nitrogen level and nitrate reductase activity were induced by AMF under Be stress. [ABSTRACT FROM AUTHOR]
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- 2022
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13. Correction: El-Sawah et al. Arbuscular Mycorrhizal Fungi and Plant Growth-Promoting Rhizobacteria Enhance Soil Key Enzymes, Plant Growth, Seed Yield, and Qualitative Attributes of Guar. Agriculture 2021, 11 , 194.
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El-Sawah, Ahmed M., El-Keblawy, Ali, Ali, Dina Fathi Ismail, Ibrahim, Heba M., El-Sheikh, Mohamed A., Sharma, Anket, Alhaj Hamoud, Yousef, Shaghaleh, Hiba, Brestic, Marian, Skalicky, Milan, Xiong, You-Cai, and Sheteiwy, Mohamed S.
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PLANT growth-promoting rhizobacteria ,VESICULAR-arbuscular mycorrhizas ,SEED yield ,MYCORRHIZAL plants ,PHYTOPATHOGENIC fungi - Abstract
Arbuscular Mycorrhizal Fungi and Plant Growth-Promoting Rhizobacteria Enhance Soil Key Enzymes, Plant Growth, Seed Yield, and Qualitative Attributes of Guar. B Figure 5. b Relationship between the mean phosphatase activity and branch/plant ( B A b ), guaran ( B C b ), and seed yield ( B E b ), and the mean dehydrogenase activity and branch/plant ( B B b ), guaran ( B D b ), and seed yield ( B F b ) in guar treated with arbuscular mycorrhizal fungi and plant growth-promoting rhizobacteria. B Figure 6. b Relationship between the mean protease activity and branch/plant ( B A b ), guaran ( B C b ), and seed yield ( B E b ), and the mean invertase activity and branch/plant ( B B b ), guaran ( B D b ), and seed yield ( B F b ) in guar treated with arbuscular mycorrhizal fungi and plant growth-promoting rhizobacteria. [Extracted from the article]
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- 2021
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14. Arbuscular Mycorrhizal Fungi and Plant Growth-Promoting Rhizobacteria Enhance Soil Key Enzymes, Plant Growth, Seed Yield, and Qualitative Attributes of Guar.
- Author
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El-Sawah, Ahmed M., El-Keblawy, Ali, Ali, Dina Fathi Ismail, Ibrahim, Heba M., El-Sheikh, Mohamed A., Sharma, Anket, Alhaj Hamoud, Yousef, Shaghaleh, Hiba, Brestic, Marian, Skalicky, Milan, Xiong, You-Cai, and Sheteiwy, Mohamed S.
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PLANT growth-promoting rhizobacteria ,VESICULAR-arbuscular mycorrhizas ,SEED yield ,MYCORRHIZAL plants ,GUAR ,MICROBIAL enzymes ,BIOFERTILIZERS ,CHLOROPHYLL - Abstract
Guar is an economically important legume crop that is used for gum production. The clean and sustainable production of guar, especially in newly reclaimed lands, requires biofertilizers that can reduce the use of mineral fertilizers, which have harmful effects on human health and the environment. The present study was conducted to investigate the effects of biofertilizers produced from Bradyrhizobium sp., Bacillus subtilis, and arbuscular mycorrhizal fungi (AMF), individually or in combinations, on microbial activity, and nutrients of the soils and the guar growth and seed quality and yield. The application of biofertilizers improved shoot length, root length, number of branches, plant dry weight, leaf area index (LAI), chlorophyll content, and nutrient uptake of guar plants compared with the control plants. Moreover, the application with biofertilizers resulted in an obvious increase in seed yield and has improved the total proteins, carbohydrates, fats, starch, and guaran contents in the seeds. Additionally, biofertilizer treatments have improved the soil microbial activity by increasing dehydrogenase, phosphatase, protease, and invertase enzymes. Soil inoculation with the optimized doses of biofertilizers saved about 25% of the chemical fertilizers required for the entire guar growth stages. Our results could serve as a practical strategy for further research into integrated plant-microbe interaction in agriculture. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
15. The Integration of Bio and Organic Fertilizers Improve Plant Growth, Grain Yield, Quality and Metabolism of Hybrid Maize (Zea mays L.).
- Author
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Gao, Canhong, El-Sawah, Ahmed M., Ali, Dina Fathi Ismail, Alhaj Hamoud, Yousef, Shaghaleh, Hiba, and Sheteiwy, Mohamed S.
- Subjects
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CORN yields , *ORGANIC fertilizers , *CORN , *PLANT growth , *GRAIN yields , *SUSTAINABLE agriculture ,CORN growth - Abstract
Expanding eco-friendly approaches to improve plant growth and crop productivity is of great important for sustainable agriculture. Therefore, a field experiment was carried out at the Faculty of Agriculture Farm, Mansoura University, Egypt during the 2018 and 2019 growing seasons to study the effects of different bio- and organic fertilizers and their combination on hybrid maize growth, yield, and grain quality. Seeds were treated with Azotobacter chrocoocum, arbuscular mycorrhizal fungi (AMF), Bacillus circulans, biogas slurry, humic acid (HA), and their combination aiming to increase the growth and yield of maize and to reduce the need for chemical fertilizers. The results showed that combined application of the biofertilizer mixture (Azotobacter chrocoocum, AMF, and Bacillus circulans) with organic fertilizers enhanced maize growth, yield, and nutrient uptake. Moreover, the bio-organic fertilization has improved the soluble sugars, starch, carbohydrates, protein, and amino acid contents in maize seeds. Additionally, the bio-organic fertilization caused an obvious increase in the microbial activity by enhancing acid phosphatase and dehydrogenase enzymes, bacterial count, and mycorrhizal colonization levels in maize rhizosphere as compared with the chemical fertilization. Additionally, the bio-organic fertilizers has improved α-amylase and gibberellins (GA) activities and their transcript levels, as well as decreased the abscisic acid (ABA) level in the seeds as compared to the chemical fertilizers. The obtained results of bio-organic fertilization on the growth parameters and yield of maize recommend their use as an alternative tool to reduce chemical fertilizers. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
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