Plant Growth-Promoting Traits of a Thermophilic Strain of the Klebsiella Group with its Effect on Rice Plant Growth
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Plant Growth‑Promoting Traits of a Thermophilic Strain of the Klebsiella Group with its Effect on Rice Plant Growth Trinetra Mukherjee1 · Avishek Banik2 · Subhra Kanti Mukhopadhyay1 Received: 19 November 2019 / Accepted: 14 May 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In agriculture, instead of synthetic fertilizers, natural bio-inoculants can be used to increase growth and yield of crops. For this purpose, we report a thermophilic bacteria Klebsiella sp. strain PMnew, isolated from Paniphala hot spring. The strain was characterized and assessed for plant growth-promoting traits. Oryza sativa L. var Swarna (rice) seeds were inoculated with the strain to study the bacterization effect on vegetative and reproductive growth of rice plants. The results indicate that PMnew produces organic acids to solubilize phosphate (550.16 ± 0.04 µg/ml), fixes nitrogen, produces indole compounds, siderophore, and ACC deaminase, and shows heavy metal resistance to chromium, cobalt, arsenic, cadmium, and mercury. It also possesses the ability to utilize several monomeric and polymeric sugars as sole carbon source including starch, agar, xylan, gelatin, and pectin, and can grow under both nutrient-rich and deficient conditions. Inoculated rice plants grew twice the length of control plants and surpassed the total grain mass yield of control plants by almost 18 times. Thus, this study brings forth a broad spectrum and easy to cultivate bio-inoculant, which can be used to increase rice production.
Introduction Synthetic fertilizers are widely used to supply beneficial nutrients to the plants to increase the plant production and the crop yield. In India, the total requirement of fertilizer to increase the quantity of food grains is approximately 13 million tonnes/annum and this need is increasing every year. This creates a demand for production and application of huge amounts of fertilizers to get maximum yield from plants. Synthetic fertilizers are more popular than bio-fertilizers, but synthetic fertilizers have long-term toxic effects on soil and water [1]. A more eco-friendly way to deal with this problem is the use of microbes as bio-fertilizers. Bio-fertilizers improve the soil quality and are a more sustainable form of improving agriculture [2]. A plant growth-promoting (PGP) Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00284-020-02032-0) contains supplementary material, which is available to authorized users. * Subhra Kanti Mukhopadhyay [email protected] 1
Department of Microbiology, The University of Burdwan, Burdwan, West Bengal 713104, India
Department of Life Sciences, Presidency University, 86/1, College Street, Kolkata, West Bengal 700073, India
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organism benefits and augments the plant growth either directly or indirectly (‘indirectly’ indicates by inhibiting conditions unfavorable for plant development). A PGP can promote plant growth by nitrogen fixing, phosphate solubilization, siderophore production, heavy
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