Biodiversity of methylotrophic microbial communities and their potential role in mitigation of abiotic stresses in plants

Kumar, Manish; Kour, Divjot; Yadav, Ajar Nath; Saxena, Raghvendra; Kumar, Pankaj; Jyoti, Anurag; Tomar, Rajesh Singh

doi:10.2478/s11756-019-00190-6

Cited by 126 publications

(47 citation statements)

References 159 publications

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“…On the other hand it is also very clear that CK is produced by plants, insects, microorganisms, nematodes, and parasitic plants. Recent studies revealed that endosymbiotic methylotrophic bacteria contribute to abiotic stress resistance via increasing plant CK levels (Jorge et al, 2019;Kumar et al, 2019).…”

Section: Role Of Cytokinin For Interaction Of Plants With Bacterial Pmentioning

confidence: 99%

Role of Cytokinins for Interactions of Plants With Microbial Pathogens and Pest Insects

et al. 2020

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It has been recognized that cytokinins are plant hormones that influence not only numerous aspects of plant growth, development and physiology, including cell division, chloroplast differentiation and delay of senescence but the interaction with other organisms, including pathogens. Cytokinins are not only produced by plants but are also by other prokaryotic and eukaryotic organism such as bacteria, fungi, microalgae and insects. Notably, cytokinins are produced both by pathogenic and also beneficial microbes and are known to induce resistance in plants against pathogen infections. In this review the contrasting role of cytokinin for the defence and susceptibility of plants against bacterial and fungal pathogen and pest insects is assessed. We also discuss the cross talk of cytokinins with other phytohormones and the underlying mechanism involved in enhancing plant immunity against pathogen infections and explore possible practical applications in crop plant production.

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Section: Role Of Cytokinin For Interaction Of Plants With Bacterial Pmentioning

confidence: 99%

Role of Cytokinins for Interactions of Plants With Microbial Pathogens and Pest Insects

et al. 2020

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“…Methylotrophic bacteria are predominant in phyllosphere which includes genera such as Methylobacterium, Methylophilus, Methylibium, Hyphomicrobium, Methylocella, Methylocapsa, and Methylocystis (Mizuno et al 2013;Iguchi et al 2013;Kwak et al 2014;Krishnamoorthy et al 2018). Methylobacterium and Sphingomonas are the predominant genera belonging to the class alphaproteobacteria reported in several plant phyllospheres (Delmotte et al 2009;Kumar et al 2019a). The bacterial community organization on phyllosphere is controlled by specific assemblage regulations (Buee et al 2009;Reinhold-Hurek et al 2015).…”

Section: Bacterial Diversity In the Phyllospherementioning

confidence: 99%

Phyllospheric Microbiomes: Diversity, Ecological Significance, and Biotechnological Applications

Sivakumar

Sathishkumar

Selvakumar

et al. 2020

Sustainable Development and Biodiversity

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The phyllosphere referred to the total aerial plant surfaces (above-ground portions), as habitat for microorganisms. Microorganisms establish compositionally complex communities on the leaf surface. The microbiome of phyllosphere is rich in diversity of bacteria, fungi, actinomycetes, cyanobacteria, and viruses. The diversity, dispersal, and community development on the leaf surface are based on the physiochemistry, environment, and also the immunity of the host plant. A colonization process is an important event where both the microbe and the host plant have been benefited. Microbes commonly established either epiphytic or endophytic mode of life cycle on phyllosphere environment, which helps the host plant and functional communication with the surrounding environment. To the scientific advancement, several molecular techniques like metagenomics and metaproteomics have been used to study and understand the physiology and functional relationship of microbes to the host and its environment. Based on the available information, this chapter describes the basic understanding of microbiome in leaf structure and physiology, microbial interactions, especially bacteria, fungi, and actinomycetes, and their adaptation in the phyllosphere environment. Further, the detailed information related to the importance of the microbiome in phyllosphere to the host plant and their environment has been analyzed. Besides, biopotentials of the phyllosphere microbiome have been reviewed.

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“…The work was in continuation of our earlier efforts to obtain beneficial methylotrophic plant-growth-promoting rhizobacterial (PGPR) organisms from the phyllosphere of crop plants. The common association of colonizing bacterial species on the plant phyllosphere (Sy et al, 2005) and the potential role of methylotrophic species as PGPRs and mitigators of abiotic stresses in crop plants have been described (Kumar et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

Mitigation of Salinity Stress in Wheat Seedlings Due to the Application of Phytohormone-Rich Culture Filtrate Extract of Methylotrophic Actinobacterium Nocardioides sp. NIMMe6

et al. 2020

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Salinity stress is an important plant growth limiting factor influencing crop productivity negatively. Microbial interventions for salinity stress mitigation have invited significant attention due to the promising impacts of interactive associations on the intrinsic mechanisms of plants. We report the impact of microbial inoculation of a halotolerant methylotrophic actinobacterium (Nocardioides sp. NIMMe6; LC140963) and seed coating of its phytohormone-rich bacterial culture filtrate extract (BCFE) on wheat seedlings grown under saline conditions. Different plant-growth-promoting (PGP) attributes of the bacterium in terms of its growth in N-limiting media and siderophore and phytohormone [indole-3-acetic acid (IAA) and salicylic acid] production influenced plant growth positively. Microbial inoculation and priming with BCFE resulted in improved germination (92% in primed seeds at 10 dS m −1), growth, and biochemical accumulation (total protein 42.01 and 28.75 mg g −1 in shoot and root tissues at 10 dS m −1 in BCFE-primed seeds) and enhanced the activity level of antioxidant enzymes (superoxide dismutase, catalase, peroxidase, and ascorbate peroxidase) to confer stress mitigation. Biopriming with BCFE proved impactful. The BCFE application has further influenced the overexpression of defense-related genes in the seedlings grown under salinity stress condition. Liquid chromatography-mass spectrometrybased characterization of the biomolecules in the BCFE revealed quantification of salicylate and indole-3-acetate (Rt 4.978 min, m/z 138.1 and 6.177 min, 129.1), respectively. The high tolerance limit of the bacterium to 10% NaCl in the culture media suggested its possible survival and growth under high soil salinity condition as microbial inoculant. The production of a high quantity of IAA (45.6 µg ml −1 of culture filtrate) by the bacterium reflected its capability to not only support plant growth under salinity condition but also mitigate stress due to the impact of phytohormone as defense mitigators. The study suggested that although microbial inoculation offers stress mitigation in plants, the phytohormone-rich BCFE from Nocardioides sp. NIMMe6 has potential implications for defense against salinity stress in wheat.

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Biodiversity of methylotrophic microbial communities and their potential role in mitigation of abiotic stresses in plants

Cited by 126 publications

References 159 publications

Role of Cytokinins for Interactions of Plants With Microbial Pathogens and Pest Insects

Role of Cytokinins for Interactions of Plants With Microbial Pathogens and Pest Insects

Phyllospheric Microbiomes: Diversity, Ecological Significance, and Biotechnological Applications

Mitigation of Salinity Stress in Wheat Seedlings Due to the Application of Phytohormone-Rich Culture Filtrate Extract of Methylotrophic Actinobacterium Nocardioides sp. NIMMe6

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