Assessing the Plant Growth Promoting Activity of  Phylloplane Associated Plant Bacteria of Rice

Devi, Veena; Gomathy, M.; Sabarinathan, K. G.; Jeyshree, M.; Kalaiyarasi, V.

doi:10.20546/ijcmas.2020.907.042

Cited by 2 publications

(1 citation statement)

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“…ACC deaminase activity by PGPRs convert ethylene to α-ketobutyrate and ammonia, lowers ethylene production in response to pathogenic infection, that further stimulate root and shoot elongation, increased root nodulation and nutrient (N, P, K) uptake (Gupta and Pandey, 2019). Cytokinin is another important phytohormone involved in plant root development, boosting the cell division, improve the root hair formation, prevent the root elongation and initiate the shoot formation (Amara et al, 2015;Devi et al, 2020;Devarajan et al, 2021). It also plays vital role in leaf expansions, root growth, chlorophyll synthesis, nutritional signalling, branching and enhance seed germination.…”

Section: Phytohormones Production/phytostimulationmentioning

confidence: 99%

Plant growth-promoting rhizobacteria (PGPR) and its mechanisms against plant diseases for sustainable agriculture and better productivity

Dutta¹,

MUTHUKRISHNAN²,

GOPALASUBRAMAIAM³

et al. 2022

Biocell

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Plant growth-promoting rhizobacteria (PGPR) are specialized bacterial communities inhabiting the root rhizosphere and the secretion of root exudates helps to, regulate the microbial dynamics and their interactions with the plants. These bacteria viz., Agrobacterium, Arthobacter, Azospirillum, Bacillus, Burkholderia, Flavobacterium, Pseudomonas, Rhizobium, etc., play important role in plant growth promotion. In addition, such symbiotic associations of PGPRs in the rhizospheric region also confer protection against several diseases caused by bacterial, fungal and viral pathogens. The biocontrol mechanism utilized by PGPR includes direct and indirect mechanisms direct PGPR mechanisms include the production of antibiotic, siderophore, and hydrolytic enzymes, competition for space and nutrients, and quorum sensing whereas, indirect mechanisms include rhizomicrobiome regulation via. secretion of root exudates, phytostimulation through the release of phytohormones viz., auxin, cytokinin, gibberellic acid, 1-aminocyclopropane-1-carboxylate and induction of systemic resistance through expression of antioxidant defense enzymes viz., phenylalanine ammonia lyase (PAL), peroxidase (PO), polyphenyloxidases (PPO), superoxide dismutase (SOD), chitinase and β-glucanases. For the suppression of plant diseases potent bio inoculants can be developed by modulating the rhizomicrobiome through rhizospheric engineering. In addition, understandings of different strategies to improve PGPR strains, their competence, colonization efficiency, persistence and its future implications should also be taken into consideration.

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