Plant Growth Promotion at Low Temperature by Phosphate-Solubilizing Pseudomonas Spp. Isolated from High-Altitude Himalayan Soil

Adhikari, Priyanka; Jain, Rahul; Sharma, Avinash; Pandey, Anita

doi:10.1007/s00248-021-01702-1

Cited by 54 publications

(42 citation statements)

References 46 publications

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“…Like the mesophilic counterparts, the organic acid (OA) theory of P solubilization by cold-active bacteria is the most widely accepted mechanism of P availability in soil (Table 2). For example, different cold-active bacteria like Pseudomonas sp., P. palleroniana, P. proteolytica, and P. azotoformans while growing at 15 • C and 25 • C released mainly oxalic and malic acids, whereas the culture supernatants of these bacteria had a poor quantity of lactic, citric, and succinic acids [20]. In general, the P solubilization by psychrotolerant Pseudomonas sp.…”

Section: Mechanisms Of P-solubilization In Cold-adapted Bacteria: An Overviewmentioning

confidence: 93%

“…Generally, the phosphate-solubilizing bacteria including psychrophiles [2,20], mesophiles [168,169], or thermophiles [156,170] convert the inaccessible complex P such as Ca 3 (PO 4 ) 2 , Fe 3 PO 4 , and Al 3 PO 4 to plant-available forms by acidification, chelation, exchange reactions, and polymeric substance formation [171,172]. On the other hand, the organically bound P (e.g., phytin, phospholipids, nucleic acid, etc.)…”

Section: Mechanisms Of P-solubilization In Cold-adapted Bacteria: An Overviewmentioning

confidence: 99%

“…Besides microbes, low temperatures negatively affect the morpho-anatomical, chemical, functional, and genetic composition of plants and, hence, decrease crop productivity [12,19]. The use of plant beneficial psychrophiles/psychrotolerant bacteria provides a sustainable option for optimizing agriculture production and offsetting the undesirable impact of cold temperatures [20,21]. The variations in plant growth-regulating abilities permit such organisms to thrive in different ecological habitats.…”

Section: Introductionmentioning

confidence: 99%

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Psychrophilic Bacterial Phosphate-Biofertilizers: A Novel Extremophile for Sustainable Crop Production under Cold Environment

et al. 2021

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Abiotic stresses, including low-temperature environments, adversely affect the structure, composition, and physiological activities of soil microbiomes. Also, low temperatures disturb physiological and metabolic processes, leading to major crop losses worldwide. Extreme cold temperature habitats are, however, an interesting source of psychrophilic and psychrotolerant phosphate solubilizing bacteria (PSB) that can ameliorate the low-temperature conditions while maintaining their physiological activities. The production of antifreeze proteins and expression of stress-induced genes at low temperatures favors the survival of such organisms during cold stress. The ability to facilitate plant growth by supplying a major plant nutrient, phosphorus, in P-deficient soil is one of the novel functional properties of cold-tolerant PSB. By contrast, plants growing under stress conditions require cold-tolerant rhizosphere bacteria to enhance their performance. To this end, the use of psychrophilic PSB formulations has been found effective in yield optimization under temperature-stressed conditions. Most of the research has been done on microbial P biofertilizers impacting plant growth under normal cultivation practices but little attention has been paid to the plant growth-promoting activities of cold-tolerant PSB on crops growing in low-temperature environments. This scientific gap formed the basis of the present manuscript and explains the rationale for the introduction of cold-tolerant PSB in competitive agronomic practices, including the mechanism of solubilization/mineralization, release of biosensor active biomolecules, molecular engineering of PSB for increasing both P solubilizing/mineralizing efficiency, and host range. The impact of extreme cold on the physiological activities of plants and how plants overcome such stresses is discussed briefly. It is time to enlarge the prospects of psychrophilic/psychrotolerant phosphate biofertilizers and take advantage of their precious, fundamental, and economical but enormous plant growth augmenting potential to ameliorate stress and facilitate crop production to satisfy the food demands of frighteningly growing human populations. The production and application of cold-tolerant P-biofertilizers will recuperate sustainable agriculture in cold adaptive agrosystems.

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Section: Mechanisms Of P-solubilization In Cold-adapted Bacteria: An Overviewmentioning

confidence: 93%

Section: Mechanisms Of P-solubilization In Cold-adapted Bacteria: An Overviewmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Psychrophilic Bacterial Phosphate-Biofertilizers: A Novel Extremophile for Sustainable Crop Production under Cold Environment

et al. 2021

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“…In this study, P-solubilization by endophytic bacteria and fungi was considerably higher which ranged from 49.57 to 718.55 µg/ml and from 6.96 to 304.06 µg/ml, respectively. Further, a negative correlation between pH and soluble phosphorus (Figures 5C,E) clearly suggested the release of various organic acids produced in the course of P-solubilization by microbes (Adhikari et al, 2021). The abilities of microbial endophytes particularly those associated with root tissues of A. euchroma, which are anyway believed to be a specialized pool of rhizosphere microbes (Afzal et al, 2019), to solubilize higher P might be attributed to the low P availability in nutrient-depleted cold desert soils.…”

Section: Functional Characterization Of Endophytesmentioning

confidence: 97%

“…NBRIP broth (50 ml) in a 250-ml Erlenmeyer flask was inoculated with 500 µl overnight grown bacteria (OD 600 = 0.5) or a 5-day-grown fungal disc (5 mm) and incubated at 20 • C at 200 rpm for 5 days. Following incubation, the soluble P in the cell-free culture supernatant was quantified by the method described by Adhikari et al (2021). A 882 was measured in a 96-well plate using a Synergy H1 microplate reader.…”

Section: Phosphate (P) Solubilization and Determination Of Phmentioning

confidence: 99%

Arnebia euchroma, a Plant Species of Cold Desert in the Himalayas, Harbors Beneficial Cultivable Endophytes in Roots and Leaves

et al. 2021

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The endophytic mutualism of plants with microorganisms often leads to several benefits to its host including plant health and survival under extreme environments. Arnebia euchroma is an endangered medicinal plant that grows naturally in extreme cold and arid environments in the Himalayas. The present study was conducted to decipher the cultivable endophytic diversity associated with the leaf and root tissues of A. euchroma. A total of 60 bacteria and 33 fungi including nine yeasts were isolated and characterized at the molecular level. Among these, Proteobacteria was the most abundant bacterial phylum with the abundance of Gammaproteobacteria (76.67%) and genus Pseudomonas. Ascomycota was the most abundant phylum (72.73%) dominated by class Eurotiales (42.42%) and genus Penicillium among isolated fungal endophytes. Leaf tissues showed a higher richness (Schao1) of both bacterial and fungal communities as compared to root tissues. The abilities of endophytes to display plant growth promotion (PGP) through phosphorus (P) and potassium (K) solubilization and production of ACC deaminase (ACCD), indole acetic acid (IAA), and siderophores were also investigated under in vitro conditions. Of all the endophytes, 21.51% produced ACCD, 89.25% solubilized P, 43.01% solubilized K, 68.82% produced IAA, and 76.34% produced siderophores. Six bacteria and one fungal endophyte displayed all the five PGP traits. The study demonstrated that A. euchroma is a promising source of beneficial endophytes with multiple growth-promoting traits. These endophytes can be used for improving stress tolerance in plants under nutrient-deficient and cold/arid conditions.

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Harnessing Microbial Solutions for Sustainable Food and Environmental Security

Adhikari,

Thathola,

Joshi

et al. 2024

Microbial Applications for Environmental Sustainability

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Plant Growth Promotion at Low Temperature by Phosphate-Solubilizing Pseudomonas Spp. Isolated from High-Altitude Himalayan Soil

Cited by 54 publications

References 46 publications

Psychrophilic Bacterial Phosphate-Biofertilizers: A Novel Extremophile for Sustainable Crop Production under Cold Environment

Psychrophilic Bacterial Phosphate-Biofertilizers: A Novel Extremophile for Sustainable Crop Production under Cold Environment

Arnebia euchroma, a Plant Species of Cold Desert in the Himalayas, Harbors Beneficial Cultivable Endophytes in Roots and Leaves

Harnessing Microbial Solutions for Sustainable Food and Environmental Security

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