Effects of the Biofertilizer OYK (Bacillus sp.) Inoculation on Endophytic Microbial Community in Sweet Potato

Salehin, Ahsanul; Hafiz, Hafizur Rahman; Hayashi, Shinobu; Adachi, Fumihiko; Itoh, Kazuhito

doi:10.3390/horticulturae6040081

Cited by 7 publications

(3 citation statements)

References 62 publications

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“…Inoculation of biofertilizer containing Bacillus sp. in sweet potato can increase the Shannon diversity index (H) by increasing the number of genera (alpha‐proteobacteria, flavobacteria) present before inoculation (Figure 3; Salehin et al, 2020). In the soybean root rhizobia where there is an abundance of alpha and beta proteobacteria, invasion of other microbes has shown to increase microbial diversity (Zhang et al, 2011).…”

Section: Key Player In Plant Growth Promotion and Nutrients Acquisitionmentioning

confidence: 99%

Bacillus subtilisimpact on plant growth, soil health and environment: Dr. Jekyll and Mr. Hyde

Mahapatra

Yadav

Ramakrishna

2022

Journal of Applied Microbiology

139

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The increased dependence of farmers on chemical fertilizers poses a risk to soil fertility and ecosystem stability. Plant growth‐promoting rhizobacteria (PGPR) are at the forefront of sustainable agriculture, providing multiple benefits for the enhancement of crop production and soil health. Bacillus subtilis is a common PGPR in soil that plays a key role in conferring biotic and abiotic stress tolerance to plants by induced systemic resistance (ISR), biofilm formation and lipopeptide production. As a part of bioremediating technologies, Bacillus spp. can purify metal contaminated soil. It acts as a potent denitrifying agent in agroecosystems while improving the carbon sequestration process when applied in a regulated concentration. Although it harbours several antibiotic resistance genes (ARGs), it can reduce the horizontal transfer of ARGs during manure composting by modifying the genetic makeup of existing microbiota. In some instances, it affects the beneficial microbes of the rhizosphere. External inoculation of B. subtilis has both positive and negative impacts on the endophytic and semi‐synthetic microbial community. Soil texture, type, pH and bacterial concentration play a crucial role in the regulation of all these processes. Soil amendments and microbial consortia of Bacillus produced by microbial engineering could be used to lessen the negative effect on soil microbial diversity. The complex plant–microbe interactions could be decoded using transcriptomics, proteomics, metabolomics and epigenomics strategies which would be beneficial for both crop productivity and the well‐being of soil microbiota. Bacillus subtilis has more positive attributes similar to the character of Dr. Jekyll and some negative attributes on plant growth, soil health and the environment akin to the character of Mr. Hyde.

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Section: Key Player In Plant Growth Promotion and Nutrients Acquisitionmentioning

confidence: 99%

Bacillus subtilisimpact on plant growth, soil health and environment: Dr. Jekyll and Mr. Hyde

Mahapatra

Yadav

Ramakrishna

2022

Journal of Applied Microbiology

139

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“…strain (LC590219), the inoculated strain was not detected, and significant plant-growth-promoting effects were not observed. The inoculation, however, changed the endophytic bacterial composition, and the changes differed between the sweet potato cultivars involved [70].…”

Section: Discussionmentioning

confidence: 96%

Development of a Multicomponent Microbiological Soil Inoculant and Its Performance in Sweet Potato Cultivation

et al. 2023

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The cultivation and consumption of sweet potato (Ipomoea batatas) are increasing globally. As the usage of chemical fertilizers and pest control agents during its cultivation may lead to soil, water and air pollution, there is an emerging need for environment-friendly, biological solutions enabling increased amounts of healthy crop and efficient disease management. Microbiological agents for agricultural purposes gained increasing importance in the past few decades. Our goal was to develop an agricultural soil inoculant from multiple microorganisms and test its application potential in sweet potato cultivation. Two Trichoderma strains were selected: Trichoderma ghanense strain SZMC 25217 based on its extracellular enzyme activities for the biodegradation of plant residues, and Trichoderma afroharzianum strain SZMC 25231 for biocontrol purposes against fungal plant pathogens. The Bacillus velezensis strain SZMC 24986 proved to be the best growth inhibitor of most of the nine tested strains of fungal species known as plant pathogens, therefore it was also selected for biocontrol purposes against fungal plant pathogens. Arthrobacter globiformis strain SZMC 25081, showing the fastest growth on nitrogen-free medium, was selected as a component with possible nitrogen-fixing potential. A Pseudomonas resinovorans strain, SZMC 25872, was selected for its ability to produce indole-3-acetic acid, which is among the important traits of potential plant growth-promoting rhizobacteria (PGPR). A series of experiments were performed to test the selected strains for their tolerance to abiotic stress factors such as pH, temperature, water activity and fungicides, influencing the survivability in agricultural environments. The selected strains were used to treat sweet potato in two separate field experiments. Yield increase was observed for the plants treated with the selected microbial consortium (synthetic community) in comparison with the control group in both cases. Our results suggest that the developed microbial inoculant has the potential to be used in sweet potato plantations. To the best of our knowledge, this is the first report about the successful application of a fungal-bacterial consortium in sweet potato cultivation.

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“…In sustainable agriculture practices, inoculation is one of the most accepted approaches to ensure the effects of plant growth promotion [46]. Inoculation with PGPB has already been studied to confirm its significant role in increasing the growth and yield of agronomically important crops, such as okra [44], maize [47], cotton [48], wheat [49], sweet potato [50,51], rice [52], canola [53] and strawberries [54].…”

Section: Introductionmentioning

confidence: 99%

Identification, Characterization, and Growth-Promoting Effects of Bacterial Endophytes Isolated from Okra (Abelmoschus esculentus L.)

et al. 2023

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Microorganisms colonize plant roots and exhibit plant growth promotion properties, therefore functioning as biofertilizers. To effectively use plant growth-promoting rhizobacteria, understanding their colonizing behavior and ability to compete with co-existing bacteria is essential. In this study, 12 endophytic bacterial strains belonging to seven genera in four classes with 99–100% homology were isolated from the roots of okra plants (Abelmoschus esculentus L.). Four isolates (Okhm3, Okhm5-4, Okhm10, and Okhm11) were inoculated on okra seeds and their effects on plant growth and colonization with single and mixed inoculations were evaluated. Okra was cultivated using sterilized vermiculite, and the growth parameters and colonization were measured 30 d after seed inoculation. All strains exhibited plant growth promotion traits that could improve okra plant growth in pot culture experiments. Notably, Okhm5-4 and Okhm10 strains (belonging to the Ensifer and Pseudomonas genera) revealed the highest growth-promoting effects on okra plants. Both strains were detected in the endosphere and rhizosphere of okra plants. Okhm10 and Okhm5-4, with lower colonization than Okhm3, showed better growth than Okhm3. Therefore, the colonization potential does not determine the growth-promoting effects. While Okhm3 populations remained stable in both inoculation conditions, the population level of other strains decreased in the mixed inoculation. This study showed bacterial endophytes isolated from Okra can be exploited as bio-fertilizers for sustainable agriculture systems.

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Effects of the Biofertilizer OYK (Bacillus sp.) Inoculation on Endophytic Microbial Community in Sweet Potato

Cited by 7 publications

References 62 publications

Bacillus subtilisimpact on plant growth, soil health and environment: Dr. Jekyll and Mr. Hyde

Bacillus subtilisimpact on plant growth, soil health and environment: Dr. Jekyll and Mr. Hyde

Development of a Multicomponent Microbiological Soil Inoculant and Its Performance in Sweet Potato Cultivation

Identification, Characterization, and Growth-Promoting Effects of Bacterial Endophytes Isolated from Okra (Abelmoschus esculentus L.)

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