Evaluation of the plant-growth-promoting abilities of endophytic bacteria from the psammophyte<i>Ammodendron bifolium</i>

Yanlei, Zhu; She, Xiao-Ping

doi:10.1139/cjm-2017-0529

Cited by 26 publications

(5 citation statements)

References 69 publications

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“…Previous studies have confirmed the plant growth-promoting ability of endophytic bacteria (termed PGPB) in various crop species (Yan et al, 2018;Zhu and She, 2018). These bacteria have been found to increase plant growth under salinity or heavy metals stress and can maintain their metabolic activity (Tirry et al, 2018;Soldan et al, 2019).…”

Section: Introductionmentioning

confidence: 86%

Are Endophytic Bacteria an Option for Increasing Heavy Metal Tolerance of Plants? A Meta-Analysis of the Effect Size

Franco-Franklin

Moreno-Riascos

Ghneim-Herrera

2021

Front. Environ. Sci.

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Plant endophytic bacteria have received special attention in recent decades for their ability to improve plant response to multiple stresses. A positive effect of endophytes on plant’s ability to cope with drought, salinity, nitrogen deficiency, and pathogens have already been demonstrated in numerous studies, and recently this evidence was consolidated in a meta-analysis of published data. Endophytic bacteria have also been implicated in increasing resistance to heavy metals in plants; despite the important biotechnological applications of such effect in heavy metal bioremediation and agriculture, efforts to systematically analyze studies in this field have been limited. In this study, we address this task with the objective of establishing whether the findings made for other types of stresses extend to the response to heavy metals. Specifically, we seek to establish if plant inoculation with plant-growth promoting endophytic bacteria have an impact on their tolerance to heavy metal stress? We carried out a meta-analysis of the effect size of inoculation with endophytic bacteria on the host plant biomass in response to heavy metal stress (aluminum, arsenic, cadmium, copper, chromium, manganese, nickel, lead, and zinc), which included 27 (from 76 published in the last 10 years) studies under controlled conditions that evaluated 19 host plants and 20 bacterial genera. Our results suggest that endophytic bacteria increase the biomass production of host plants subjected to different heavy metals, indicating their effectiveness in protecting plants from a wide range of metal toxicities. Stress mitigation by the bacteria was similar among the different plant groups with the exception of non-accumulating plants that benefit most from the symbiotic association. Host identity and heavy metal concentration seem to influence the effect of the bacteria. Our analysis revealed that bacterial consortia provide the greatest benefit although the most common biotechnological applications are not directed towards them, and support the value of endophytic bacteria as an alternative to mitigate heavy metal stress in a wide variety of hosts.

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Section: Introductionmentioning

confidence: 86%

Are Endophytic Bacteria an Option for Increasing Heavy Metal Tolerance of Plants? A Meta-Analysis of the Effect Size

Franco-Franklin

Moreno-Riascos

Ghneim-Herrera

2021

Front. Environ. Sci.

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“…This is an effective way to suppress phytopathogens and enable the host to obtain protection from biotic stress. In the study of Zhu and She, 45 endophytic bacteria were isolated from the Ammodendron bifolium plant, 40% of which showed significant activities for amylase and cellulose production, 13.3% and 53.3% of which exhibited protease and lipase activity, respectively [ 105 ]. An endophytic isolate of Actinoplanes missouriensis was reported to secret large amounts of chitinase, and inhibited the growth of the pathogen Plectosporium tabacinum by degrading the hyphae and causing plasmolysis and cell wall lysis [ 106 ].…”

Section: Multifunctions Of Endophytes and Their Metabolites In Plant ...mentioning

confidence: 99%

The Multifunctions and Future Prospects of Endophytes and Their Metabolites in Plant Disease Management

et al. 2022

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Endophytes represent a ubiquitous and magical world in plants. Almost all plant species studied by different researchers have been found to harbor one or more endophytes, which protect host plants from pathogen invasion and from adverse environmental conditions. They produce various metabolites that can directly inhibit the growth of pathogens and even promote the growth and development of the host plants. In this review, we focus on the biological control of plant diseases, aiming to elucidate the contribution and key roles of endophytes and their metabolites in this field with the latest research information. Metabolites synthesized by endophytes are part of plant disease management, and the application of endophyte metabolites to induce plant resistance is very promising. Furthermore, multi-omics should be more fully utilized in plant–microbe research, especially in mining novel bioactive metabolites. We believe that the utilization of endophytes and their metabolites for plant disease management is a meaningful and promising research direction that can lead to new breakthroughs in the development of more effective and ecosystem-friendly insecticides and fungicides in modern agriculture.

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“…They also protect the plant from phytopathogens, suppressing plant diseases via ammonia and antibiotic production, modifying the production of stress-related proteins, and by phytoremediation (hydrocarbon and heavy metal removal), thereby acting as biocontrol agents [ 6 ]. They protect plants from various environmental stresses like salinity, drought, and temperature, thereby enhancing their capability to acclimatize to stressful conditions [ 10 ]. Halo-tolerant PGPEB has been reported to help plants tolerate high salinity through various mechanisms—by producing reactive oxygen species (ROS) scavengers, by reducing osmotic, ion, and oxidative stress, by producing ACC-deaminase enzymes to breakdown ethylene precursor ACC [ 11 ], and by the modulation of phytohormones, siderophores, and exopolysaccharides [ 12 – 14 ].…”

Section: Introductionmentioning

confidence: 99%

Endophytic bacteria Klebsiella spp. and Bacillus spp. from Alternanthera philoxeroides in Madiwala Lake exhibit additive plant growth-promoting and biocontrol activities

Biswas,

Philip,

Jayaram

et al. 2023

Journal of Genetic Engineering and Biotechnology

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Background The worldwide increase in human population and environmental damage has put immense pressure on the overall global crop production making it inadequate to feed the entire population. Therefore, the need for sustainable and environment-friendly practices to enhance agricultural productivity is a pressing priority. Endophytic bacteria with plant growth-promoting ability and biocontrol activity can strongly enhance plant growth under changing environmental biotic and abiotic conditions. Herein, we isolated halotolerant endophytic bacteria from an aquatic plant, Alternanthera philoxeroides, from the polluted waters of Madiwala Lake in Bangalore and studied their plant growth promotion (PGP) and biocontrol ability for use as bioinoculant. Results The isolated bacterial endophytes were screened for salt tolerance ranging from 5 to 15% NaCl concentration. Klebsiella pneumoniae showed halotolerant up to 10% NaCl and Bacillus amyloliquefaciens and Bacillus subtilis showed up to 15%. All three strains demonstrated good PGP abilities such as aminocyclopropane-1-carboxylic acid (ACC) deaminase activity, phosphate solubilization, ammonia production, and nitrogen fixation. In addition, K. pneumoniae also exhibited high indoleacetic acid (IAA) production (195.66 ± 2.51 µg/ml) and potassium solubilization (2.13 ± 0.07 ppm). B. amyloliquefaciens and B. subtilis showed good extracellular enzyme production against cellulase, lipase, protease, and amylase. Both the isolates showed a broad spectrum of antimicrobial activity against the tested organisms. The optimization of IAA production by K. pneumoniae was done by the response surface methodology (RSM) tool. Characterization of IAA produced by the isolate was done by gas chromatography-mass spectrometry (GCMS) analysis. The enhanced plant growth-promoting ability of K. pneumoniae was also demonstrated using various growth parameters in a pot trial experiment using the seeds of Vigna unguiculata. Conclusion The isolated bacterial endophytes reported in this study can be utilized as PGP promotion and biocontrol agents in agricultural applications, to enhance crop yield under salinity stress. The isolate K. pneumoniae may be used as a biofertilizer in sustainable agriculture and more work can be done to optimize the best formulations for its application as a microbial inoculant for crops.

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Evaluation of the plant-growth-promoting abilities of endophytic bacteria from the psammophyteAmmodendron bifolium

Cited by 26 publications

References 69 publications

Are Endophytic Bacteria an Option for Increasing Heavy Metal Tolerance of Plants? A Meta-Analysis of the Effect Size

Are Endophytic Bacteria an Option for Increasing Heavy Metal Tolerance of Plants? A Meta-Analysis of the Effect Size

The Multifunctions and Future Prospects of Endophytes and Their Metabolites in Plant Disease Management

Endophytic bacteria Klebsiella spp. and Bacillus spp. from Alternanthera philoxeroides in Madiwala Lake exhibit additive plant growth-promoting and biocontrol activities

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