المؤلفون: El-Saadony, Mohamed T., Desoky, El-Sayed M., El-Tarabily, Khaled A., AbuQamar, Synan F., Saad, Ahmed M.

المصدر: Environmental Science & Pollution Research; Apr2024, Vol. 31 Issue 18, p27465-27484, 20p

مصطلحات موضوعية: HEAVY metal toxicology, PLANT growth, PLANT growth-promoting rhizobacteria, RHIZOBACTERIA, SUSTAINABILITY, PEPPERS, CAPSICUM annuum

مستخلص: Microorganisms are cost-effective and eco-friendly alternative methods for removing heavy metals (HM) from contaminated agricultural soils. Therefore, this study aims to identify and characterize HM-tolerant (HMT) plant growth-promoting rhizobacteria (PGPR) isolated from industry-contaminated soils to determine their impact as bioremediators on HM-stressed pepper plants. Four isolates [Pseudomonas azotoformans (Pa), Serratia rubidaea (Sr), Paenibacillus pabuli (Pp) and Bacillus velezensis (Bv)] were identified based on their remarkable levels of HM tolerance in vitro. Field studies were conducted to evaluate the growth promotion and tolerance to HM toxicity of pepper plants grown in HM-polluted soils. Plants exposed to HM stress showed improved growth, physio-biochemistry, and antioxidant defense system components when treated with any of the individual isolates, in contrast to the control group that did not receive PGPR. The combined treatment of the tested HMT PGPR was, however, relatively superior to other treatments. Compared to no or single PGPR treatment, the consortia (Pa+Sr+Pp+Bv) increased the photosynthetic pigment contents, relative water content, and membrane stability index but lowered the electrolyte leakage and contents of malondialdehyde and hydrogen peroxide by suppressing the (non) enzymatic antioxidants in plant tissues. In pepper, Cd, Cu, Pb, and Ni contents decreased by 88.0-88.5, 63.8-66.5, 66.2-67.0, and 90.2-90.9% in leaves, and 87.2-88.1, 69.4-70.0%, 80.0-81.3, and 92.3%% in fruits, respectively. Thus, these PGPR are highly effective at immobilizing HM and reducing translocation in planta. These findings indicate that the application of HMT PGPR could be a promising "bioremediation" strategy to enhance growth and productivity of crops cultivated in soils contaminated with HM for sustainable agricultural practices. [ABSTRACT FROM AUTHOR]

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المؤلفون: Bong-Gyu Mun, Hussain, Adil, Yeon-Gyeong Park, Sang-Mo Kang, In-Jung Lee, Byung-Wook Yun

المصدر: Frontiers in Plant Science; 2024, p1-15, 15p

مصطلحات موضوعية: BACILLUS (Bacteria), PLANT growth-promoting rhizobacteria, CHLOROPHYLL, SOYBEAN, SOY proteins, PLANT growth

مستخلص: Plant growth-promoting rhizobacteria (PGPR) colonize plant roots, establish a mutualistic relationship with the plants and help them grow better. This study reports novel findings on the plant growth-promoting effects of the PGPR Bacillus aryabhattai. Soil was collected from a soybean field, PGPR were isolated, identified, and characterized for their ability to promote plant growth and development. The bacterium was isolated from the soybean rhizosphere and identified as B. aryabhattai strain SRB02 via 16s rRNA sequencing. As shown by SEM, the bacterium successfully colonized rice and soybean roots within 2 days and significantly promoted the growth of the GA-deficient rice cultivar Waito-C within 10 days, as well as the growth of soybean plants with at least six times longer shoots, roots, higher chlorophyll content, fresh, and dry weight after 10 days of inoculation. ICP analysis showed up to a 100% increase in the quantity of 18 different amino acids in the SRB02-treated soybean plants. Furthermore, the 2-DE gel assay indicated the presence of several differentially expressed proteins in soybean leaves after 24 hrs of SRB02 application. MALDI-TOF-MS identified bconglycinin and glycinin along with several other proteins that were traced back to their respective genes. Analysis of bacterial culture filtrates via GCMS recorded significantly higher quantities of butanoic acid which was approximately 42% of all the metabolites found in the filtrates. The application of 100 ppm butanoic acid had significantly positive effects on plant growth via chlorophyll maintenance. These results establish the suitability of B. aryabhattai as a promising PGPR for field application in various crops. [ABSTRACT FROM AUTHOR]

: Copyright of Frontiers in Plant Science is the property of Frontiers Media S.A. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Benaissa, Asmaa

المصدر: Journal of Basic Microbiology; Mar2024, Vol. 64 Issue 3, p1-14, 14p

مصطلحات موضوعية: SUSTAINABLE agriculture, RHIZOBACTERIA, SOILBORNE plant diseases, PLANT growth-promoting rhizobacteria, AGRICULTURE

مستخلص: General plant diseases as well as soil‐borne pathogens severely reduce agricultural yield. The rhizosphere (the region of the soil that includes and surrounds the roots) is an important niche for microbial diversity in particular phytobeneficial bacteria including plant growth‐promoting rhizobacteria (PGPR) which have been used for a very long time to combat plant diseases. Pathogen control and crop productivity can both be improved through the use of PGPR several mechanisms, including iron‐based nutrition, antibiotics, volatile substances, enzymes, biofilm, allelochemicals, and so on. Their modes of action and molecular mechanisms have improved our comprehension of how they are used to control crop disease. Therefore, there is a lot of literal information available regarding PGPR, but this review stands out since it starts with the fundamentals: the concept of the rhizosphere and the colonization process of the latter, particularly because it covers the most mechanisms. A broad figure is used to present the study's findings. The advantages of using PGPR as bioinoculants in sustainable agriculture are also mentioned. [ABSTRACT FROM AUTHOR]

: Copyright of Journal of Basic Microbiology is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Laoken, A.¹ iceman.aaa@hotmail.com, Polthanee, A.², Promkhambut, A.³, Tre-loges, V.³

المصدر: Indian Journal of Agricultural Research. Feb2023, Vol. 57 Issue 1, p84-88. 5p.

مصطلحات موضوعية: *CASSAVA growing, *PLANT growth-promoting rhizobacteria, *CASSAVA, *UPLAND rice, *VALUE (Economics), *CORPORATE profits

مستخلص: Background: Rainfed lowland rice crops are grown only once a year in the rainy season. In general, the fields are left fallowed after harvest of rice in the dry season. Cassava a drought tolerant-crop has the potential to grow the following rice. One of the methods to sustain production is through the application of beneficial microorganisms such as plant growth-promoting rhizobacteria and foliar bio-extracted fertilizer. Methods: Cassava was planted in the dry season (December-June). Nutrient management treatments included; 1) application of chemical fertilizer as recommendation rate (CFR), 2) application of CFR combined with plant growth-promoting rhizobacteria (PGPR), 3) application of 80% of CFR combined with PGPR and 4) application of CFR combined with bio-extracted pig manure (BPM) which laid out in randomized complete block design. Result: Interaction between CFR and PGPR gave the maximum storage root yield of 23.1 t ha-1 without significant differences with the application of CFR alone (20.3 t ha-1). Such treatment also provides higher net income than those of the other treatments in the present experiment. [ABSTRACT FROM AUTHOR]

المؤلفون: Muhammad Qadir, Anwar Hussain, Mohib Shah, Muhammad Hamayun, Asma A. Al-Huqail, Amjad Iqbal, Sajid Ali

المصدر: Heliyon, Vol 10, Iss 12, Pp e33078- (2024)

مصطلحات موضوعية: Antioxidants, Arsenic contamination, Biotransformation, Hydroponics, Plant growth promoting rhizobacteria, Science (General), Q1-390, Social sciences (General), H1-99

الوصف: The issue of arsenic (As) contamination in the environment has become a critical concern, impacting both human health and ecological equilibrium. Addressing this challenge requires a comprehensive strategy encompassing water treatment technologies, regulatory measures for industrial effluents, and the implementation of sustainable agricultural practices. In this study, diverse strategies were explored to enhance As accumulation in the presence of Acinetobacter bouvetii while safeguarding the host from the toxic effects of arsenate exposure. The sunflower seedlings associated with A. bouvetii demonstrated a favorable relative growth rate (RGR) and net assimilation rate (NAR) even less than 100 ppm of As stress. Remarkably, the NAR and RGR of A. bouvetii-associated seedlings outperformed those of control seedlings cultivated without A. bouvetii in As-free conditions. Additionally, a markedly greater buildup of bio-transformed As was observed in A. bouvetii-associated seedlings (P = 0.05). An intriguing observation was the normal levels of reactive oxygen species (ROS) in A. bouvetii-associated seedlings, along with elevated activities of key enzymatic antioxidants like catalases (CAT), ascorbate peroxidase (APX), superoxide dismutase (SOD), and peroxidases (POD), along with non-enzymatic antioxidants (phenols and flavonoids). This coordinated antioxidant defense system likely contributed to the improved survival and growth of the host plant species amidst As stress. A. bouvetii not only augmented the growth of the host plants but also facilitated the uptake of bio-transformed As in the contaminated medium. The rhizobacterium's modulation of various biochemical and physiological parameters indicates its role in ensuring the better survival and progression of the host plants under As stress.

وصف الملف: electronic resource

العلاقة: http://www.sciencedirect.com/science/article/pii/S2405844024091096Test; https://doaj.org/toc/2405-8440Test

الوصول الحر: https://doaj.org/article/b2d16d9d7dde49f893ac27b2cf120e4cTest

المؤلفون: Gomez, Melissa Y, Schroeder, Mercedes M, Chieb, Maha, McLain, Nathan K, Gachomo, Emma W

المصدر: BMC Plant Biology. 23(1)

مصطلحات موضوعية: Plant Biology, Agricultural, Veterinary and Food Sciences, Crop and Pasture Production, Biological Sciences, Arabidopsis, Salt Tolerance, Stress, Physiological, Sodium, Plant Roots, Gene Expression Regulation, Plant, Transcription Factors, Arabidopsis Proteins, Plant growth promoting rhizobacteria, Salt stress, JAR1, MYC2, Reactive oxygen species, Microbiology, Plant Biology & Botany, Crop and pasture production, Plant biology

الوصف: BackgroundPlant growth promoting rhizobacteria (PGPR), such as Bradyrhizobium japonicum IRAT FA3, are able to improve seed germination and plant growth under various biotic and abiotic stress conditions, including high salinity stress. PGPR can affect plants' responses to stress via multiple pathways which are often interconnected but were previously thought to be distinct. Although the overall impacts of PGPR on plant growth and stress tolerance have been well documented, the underlying mechanisms are not fully elucidated. This work contributes to understanding how PGPR promote abiotic stress by revealing major plant pathways triggered by B. japonicum under salt stress.ResultsThe plant growth-promoting rhizobacterial (PGPR) strain Bradyrhizobium japonicum IRAT FA3 reduced the levels of sodium in Arabidopsis thaliana by 37.7%. B. japonicum primed plants as it stimulated an increase in jasmonates (JA) and modulated hydrogen peroxide production shortly after inoculation. B. japonicum-primed plants displayed enhanced shoot biomass, reduced lipid peroxidation and limited sodium accumulation under salt stress conditions. Q(RT)-PCR analysis of JA and abiotic stress-related gene expression in Arabidopsis plants pretreated with B. japonicum and followed by six hours of salt stress revealed differential gene expression compared to non-inoculated plants. Response to Desiccation (RD) gene RD20 and reactive oxygen species scavenging genes CAT3 and MDAR2 were up-regulated in shoots while CAT3 and RD22 were increased in roots by B. japonicum, suggesting roles for these genes in B. japonicum-mediated salt tolerance. B. japonicum also influenced reductions of RD22, MSD1, DHAR and MYC2 in shoots and DHAR, ADC2, RD20, RD29B, GTR1, ANAC055, VSP1 and VSP2 gene expression in roots under salt stress.ConclusionOur data showed that MYC2 and JAR1 are required for B. japonicum-induced shoot growth in both salt stressed and non-stressed plants. The observed microbially influenced reactions to salinity stress in inoculated plants underscore the complexity of the B. japonicum jasmonic acid-mediated plant response salt tolerance.

وصف الملف: application/pdf

الوصول الحر: https://escholarship.org/uc/item/2634g8hbTest

المؤلفون: Ait Rahou, Youssef^1,2,3 (AUTHOR), Douira, Allal³ (AUTHOR), Tahiri, Abdel-Ilah^1,2 (AUTHOR), Cherkaoui, El Modafar¹ (AUTHOR), Benkirane, Rachid³ (AUTHOR), Meddich, Abdelilah^1,2 (AUTHOR) a.meddich@uca.ma

المصدر: Canadian Journal of Plant Pathology. Dec2022, Vol. 44 Issue 6, p806-827. 22p.

مصطلحات موضوعية: *VERTICILLIUM dahliae, *PLANT growth-promoting rhizobacteria, *COMPOSTING, *TOMATOES, *VASCULAR resistance, *CHLOROPHYLL spectra, *FRUIT yield

الملخص (بالإنجليزية): This study aimed to evaluate the effect of plant growth-promoting rhizobacteria (PGPR) and compost, applied alone or in combination, on tomato resistance to vascular wilt caused by Verticillium dahliae. Improved management of vascular wilt is important for enhanced productivity of greenhouse-grown susceptible tomato plants. The application of compost and PGPR resulted in a reduction in infection parameters compared with untreated plants inoculated with the pathogen, as well as activation of plant defence mechanisms. In the presence of the pathogen, compost application significantly improved the total fresh and dry weights by 97% and 71%, respectively, compared with pathogen-inoculated controls. The combination of compost with PGPR significantly increased chlorophyll fluorescence and stomatal conductance compared with the infected-control. In addition, the combination of compost and PGPR reduced the accumulation of stress markers such as malondialdehyde and hydrogen peroxide by 48% and 77%, respectively, and promoted the activity of antioxidant enzymes. Fruit yield and quality were also significantly improved relative to the control. The results suggest that compost applied alone or in combination with PGPR helps to suppress vascular wilt and to improve the yield and quality of tomatoes. [ABSTRACT FROM AUTHOR]

Abstract (French): Cette étude visait à évaluer les effets des rhizobactéries favorisant la croissance des plantes (RFCP) et du compost, appliqué seul ou combiné, sur la résistance de la tomate à la flétrissure vasculaire causée par Verticillium dahliae. Afin d'accroître la productivité des tomates de serre sensibles, il importe d'améliorer la gestion de la flétrissure vasculaire. L'application de compost et de RFCP a entraîné une réduction des paramètres infectieux, comparativement aux plants non traités inoculés avec l'agent pathogène, de même qu'une activation des mécanismes de défense de la plante. En présence de l'agent pathogène, l'application de compost a significativement amélioré les poids totaux frais et secs de 97% et 71%, respectivement, comparativement aux témoins inoculés. La combinaison de compost et de RFCP a accru significativement la fluorescence chlorophyllienne et la conductance stomatique, comparativement aux témoins infectés. En outre, la combinaison de compost et de RFCP a réduit l'accumulation de marqueurs de stress comme le malonaldéhyde et le peroxyde d'hydrogène de 48% et de 77%, respectivement, et a promu l'activité des enzymes antioxydantes. Le rendement et la qualité des fruits ont été aussi notablement améliorés par rapport aux témoins. Les résultats suggèrent que le compost appliqué seul ou avec les RFCP contribue à supprimer la flétrissure vasculaire et à améliorer le rendement et la qualité des tomates. [ABSTRACT FROM AUTHOR]

المؤلفون: Muhammad, Faqeer¹ (AUTHOR), Raza, Muhammad Aown Sammar¹ (AUTHOR) aown.sammar@iub.edu.pk, Iqbal, Rashid¹ (AUTHOR), Zulfiqar, Faisal² (AUTHOR), Aslam, Muhammad Usman¹ (AUTHOR), Yong, Jean Wan Hong³ (AUTHOR) aown.sammar@iub.edu.pk, Altaf, Muhammad Ahsan⁴ (AUTHOR), Zulfiqar, Bilal¹ (AUTHOR), Amin, Jawad¹ (AUTHOR), Ibrahim, Muhammad Arif¹ (AUTHOR)

المصدر: Biology (2079-7737). Nov2022, Vol. 11 Issue 11, p1564. 19p.

مصطلحات موضوعية: *BIOFORTIFICATION, *PLANT growth-promoting rhizobacteria, *CHEMICAL composition of plants, *RHIZOBACTERIA, *WHEAT, *DROUGHTS, *CHLOROPHYLL

مصطلحات جغرافية: PAKISTAN

مستخلص: Simple Summary: Wheat is a vital source of food, and its production is increasingly threatened by drought episodes. Moreover, its cultivation under water deficit situations along with zinc deficient soils is a major concern of declined wheat grain quantity and quality. Drought-linked changes in nutrient use efficiency, photosynthetic mechanisms, and chemical composition of wheat plants ultimately led to poorer harvest. Therefore, we aimed to understand the drought-ameliorating and grain nutritional improving effects in wheat by rhizobacteria (Azospirillum brasilense) and ZnO nanoparticles (NPs) under various growth stage-based drought stress episodes. Rhizobacteria colonized the host plant rhizosphere and provided growth promotion and stress amelioration. ZnO NPs were recognized as a potential water and zinc deficiency alleviator, and general growth promoter by triggering nitrogen metabolism, chlorophyll synthesis, membrane integrity, and grain zinc biofortification activities. Physio-biochemical observations indicated significantly higher positive effects under co-application over the sole use of either microbial or nanomaterials. Based on our research, it was concluded that co-applied Azospirillum brasilense and ZnO NPs generally increase wheat productivity under drought episodes with low operational cost to growers. Further, plausible synergistic physiological enhancement by NPs and rhizobacteria interaction may contribute towards sustainable wheat crop management under abiotic stresses. Drought is a major abiotic factor and affects cereal-based staple food production and reliability in developing countries such as Pakistan. To ensure a sustainable and consistent food supply, holistic production plans involving the integration of several drought mitigation approaches are required. Using a randomized complete block design strategy, we examined the drought-ameliorating characteristics of plant growth-promoting rhizobacteria (PGPR) and nanoparticles (NPs) exclusively or as a combined application (T4) through three stages (D1, D2, and D3) of wheat growth (T1, control). Our field research revealed that Azospirillum brasilense alone (T2) and zinc oxide NPs (T3) improved wheat plant water relations, chlorophyll, proline, phenolics and grain quality, yield, and their allied traits over the stressed treatments. Specifically, the best outcome was observed in the combined treatment of PGPR and ZnO NPs (T4). Interestingly, the combined treatment delivered effective drought mitigation through enhanced levels of antioxidants (15% APX, 27% POD, 35% CAT, 38% PPO and 44% SOD) over controls at the grain-filling stage (GFS, D3 × T1). The 40% improvements were recorded under the combined treatment at GFS over their respective controls. Their combined usage (PGPR and ZnO NPs) was concluded as an effective strategy for building wheat resilience under drought, especially in arid and semi-arid localities. [ABSTRACT FROM AUTHOR]

المؤلفون: Md. Motaher Hossain

المصدر: Caraka Tani: Journal of Sustainable Agriculture, Vol 39, Iss 1, Pp 81-93 (2024)

مصطلحات موضوعية: antagonist, common root rot, plant growth promoting rhizobacteria, root colonization, spot blotch, Agriculture

الوصف: Wheat (Triticum aestivum L.), a vital cereal, faces significant challenges from common root rot and spot blotch diseases caused by Bipolaris sorokiniana. This study aimed to explore the potential of plant growth promoting rhizobacteria (PGPR) to enhance wheat growth, reduce fertilizer input, and combat Bipolaris diseases. Two PGPR isolates, selected for their superior antagonistic properties, were identified as Stenotrophomonas koreensis RB11 and Bacillus amyloliquefaciens RB12. These PGPR strains displayed multiple plant growth promoting and biocontrol attributes, including phosphate solubilization, indole-3-acetic acid production, nitrogen fixation and antagonism against B. sorokiniana and other fungi. Wheat seed priming with the PGPR significantly improved germination, plant growth, nutrient content and biomass carbon accumulation in the rhizosphere soil. Importantly, the application of RB11 and RB12 allowed for a 25% and 50% reduction in nitrogen fertilizer usage, respectively, without compromising the yield. RB11 and RB12 also demonstrated potent inhibitory effects on B. sorokiniana conidial germination and significantly controlled common root rot and spot blotch in wheat, similar to those observed with the fungicide Protaf 250EC. Overall, this study underscores the multifaceted roles of S. koreensis RB11 and B. amyloliquefaciens RB12 in promoting wheat growth, reducing fertilizer inputs and effectively suppressing wheat pathogens. These findings contribute to the development of PGPR-based strategies for sustainable crop production and disease control.

وصف الملف: electronic resource

العلاقة: https://jurnal.uns.ac.id/carakatani/article/view/79208Test; https://doaj.org/toc/2613-9456Test; https://doaj.org/toc/2599-2570Test

الوصول الحر: https://doaj.org/article/17f3ecc8b735495abfc2a7ef16672ca0Test

المؤلفون: Dasgan, Hayriye Yildiz, Yilmaz, Dilek, Zikaria, Kamran, Ikiz, Boran, Gruda, Nazim S.

المصدر: Horticulturae; Dec2023, Vol. 9 Issue 12, p1274, 19p

مصطلحات موضوعية: LETTUCE, SUSTAINABLE agriculture, PLANT growth-promoting rhizobacteria, PHOSPHATE fertilizers, HYDROPONICS, VESICULAR-arbuscular mycorrhizas, AGRICULTURE

مستخلص: Hydroponics is a contemporary agricultural system providing precise control over growing conditions, potentially enhancing productivity. Biofertilizers are environmentally friendly, next-generation fertilizers that augment product yield and quality in hydroponic cultivation. In this study, we investigated the effect of three bio-fertilizers in a hydroponic floating system, microalgae, plant growth-promoting rhizobacteria (PGPR) and arbuscular mycorrhizal fungi (AMF), combined with a 50% reduction in mineral fertilizer, on lettuce yield and quality parameters including antioxidants: vitamin C, total phenols and flavonoids. The treatments tested were: 100% mineral fertilizer (control 1), 50% mineral fertilizer (control 2), 50% mineral fertilizer with microalgae, 50% mineral fertilizer with PGPR and 50% mineral fertilizer with AMF. The research was conducted during the winter months within a controlled environment of a glasshouse in a Mediterranean climate. The PGPR comprised three distinct bacterial strains, while the AMF comprised nine different mycorrhizal species. The microalgae consisted of only a single species, Chlorella vulgaris. AMF inoculation occurred once during seed sowing, while the introduction of PGPR and microalgae occurred at 10-day intervals into the root medium. Our findings revealed that the treatment with PGPR resulted in the highest growth parameters, including the lettuce circumference, stem diameter and fresh leaf weight. The 100% mineral fertilizer and PGPR treatments also yielded the highest lettuce production. Meanwhile, the treatment with AMF showed the highest total phenol and flavonoid content, which was statistically similar to that of the PGPR treatment. Furthermore, the PGPR recorded the maximum range of essential nutrients, including nitrogen (N), potassium (K), iron (Fe), zinc (Zn) and copper (Cu). Thus, the inclusion of PGPR holds promise for optimizing the lettuce growth and nutrient content in hydroponic systems. In conclusion, PGPR has the potential to enhance nutrient availability in a floating hydroponic system, reducing the dependence on chemical fertilizers. This mitigates environmental pollution and fosters sustainable agriculture. [ABSTRACT FROM AUTHOR]

: Copyright of Horticulturae is the property of MDPI and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)