Analysis of ecological attributes of bacterial phosphorus solubilizers, native to pine forests of Lower Himalaya

Hayat, Waseem; Aman, Hina; Irshad, Usman; Azeem, Muhammad; Iqbal, Akhtar; Nazir, Rashid

doi:10.1016/j.apsoil.2016.11.004

Cited by 18 publications

(12 citation statements)

References 40 publications

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“…Hayat et al [ 32 ] reported concentrations of organic acids in their solubilization experiments a few times lower (10.2 mM). Wei et al [ 33 ] reported that the total concentrations of organic acids reached the maximum at the cooling stage in all treatments during composting, ranging from 45.7 mg/g to 82.7 mg/g, also a few times smaller than the results reported herein.…”

Section: Resultsmentioning

confidence: 99%

Phosphorus Solubilization by Bacillus Species

2018

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Microbial solubilization applies the natural ability of a microorganism to liberate phosphorus from unavailable structures. The main mechanism recognized to be responsible for the solubilization of phosphorus is the production of different types of organic acids. Three kinds of Bacillus species and three types of raw materials (poultry bones, fish bones, and ash) were tested for solubilization. The following parameters were compared for all discussed cases: pH, specific growth rate, solubilization factor, released phosphorus concentration, and total and individual concentration of organic acids. Utilization of ash brought about the highest specific and maximum specific growth rates. A decrease in pH was observed in most of the discussed cases with the exception of fish bones. At the same time, fish bones had the highest concentration of released P2O5 and the highest total concentration of produced organic acids (gluconic, lactic, acetic, succinic, and propionic) in all discussed cases. The tested Bacillus species produced the mentioned acids with the exception of B. megaterium, where propionic acid was not present. The lactic and acetic acids were those produced in the highest amount. The kind of raw materials and type of Bacillus species used in solubilization had a strong influence on the kind of organic acids that were detected in the broth culture and its total concentration, which had a direct influence on the amount of released phosphorus. The combination of Bacillus megaterium with the fish bones at 5 g/L is proposed as the pair that gives the highest concentration of released phosphorus (483 ± 5 mg/L).

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Section: Resultsmentioning

confidence: 99%

Phosphorus Solubilization by Bacillus Species

2018

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“…The isolates were named as USP1, USP2, USP3, and USP4. The absence of antagonistic interaction between the bacterial isolates was confirmed using the cross-streak method as described by Hayat et al (2017) .…”

Section: Methodsmentioning

confidence: 99%

Bacterial Subspecies Variation and Nematode Grazing Change P Dynamics in the Wheat Rhizosphere

Irshad

Yergeau

2018

Front. Microbiol.

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Low phosphorus soils are thought to constitute the majority of soils worldwide and cannot support intensive agriculture without high fertilizer inputs. Rhizobacteria are well-known to modify P dynamics and an increased bacterial diversity normally has a positive impact on various process rates. However, it is not known how variation in bacterial diversity at the subspecies level could influence trophic interactions in the rhizosphere and its consequences on plant P nutrition. We therefore hypothesized that the interactions between closely related P solubilizing bacteria and their grazing nematodes could improve plant P dynamics from an unavailable P source. We isolated four Pseudomonas poae strains and extracted nematodes from a Saskatchewan wheat field soil sample. The potential of all bacterial isolates with and without nematodes for increasing P availability in the wheat rhizosphere was tested in controlled microcosms with Ca3(PO4)2 as sole P source. Liberated P, phosphatase activity, plant P and bacterial abundance based on phnX gene copies were determined. Phosphorus solubilization efficiency of isolates varied between isolates whereas phosphatase enzyme activity was only detected under nematodes grazing and during the first 15 days of the experiment. Nematodes grazing upon individual Pseudomonas poae increased phosphatase enzyme activity, bacterial abundance, but decreased plant P concentration compared to non-grazed system. In contrast, the treatment combining all Pseudomonas poae isolates together with nematodes resulted in significant increases in P availability and plant P concentration. Diverse P-solubilizing efficiency and interaction with nematodes within the same bacterial “species” suggest that P dynamics might be linked to micro variation in soil diversity that would not accurately be picked up using common tools such as 16S rRNA gene sequencing.

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“…saprotrophy, pathogenicity, and symbiosis. Bacteria in soil move towards or along fungal hyphae either by motility or chemotaxis (Hayat et al 2017). In addition to the interrelationship between bacterial and fungal communities with respect to their structure, diversity, and activity (Tardy et al 2014;Zhang et al 2017), they are involved in regulating soil biochemistry (Zhang et al 2017) and structure (Sessitsch et al 2001;Gupta 2011;Sun et al 2015), as well as in plant stress tolerance, content and composition of plant secondary metabolites, nutrient status, productivity and biodiversity (Van der Heijden et al 1998Hart and Klironomos 2003;Urcelay and Díaz 2003;Hu et al 2017;Pistelli et al 2017).…”

Section: Plant-microbe-fungi Symbiotic Relationships and Diversity Unmentioning

confidence: 99%

Managing plant-environment-symbiont interactions to promote plant performance under low temperature stress

Askari‐Khorasgani

Hatterman‐Valenti

Flores

et al. 2019

Journal of Plant Nutrition

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Low temperature stresses, also referred to as cold temperature stresses, including chilling and freezing temperatures, are among the major abiotic stresses that severely reduces plant yield, quality, and marketability and pose a serious threat to plant production during whole plant life cycles. Plant-environment-symbiont interactions determine the symbiotic and crop performance and tolerance to biotic and abiotic stresses. To achieve the optimum outcome, it is essential to consider not only plantsymbiont relationships, but also symbiont adaptation and symbiont-symbiont interactions. Improving multi-symbiotic component systems and symbiont breeding together can be a useful strategy to improve symbiosis and, thus, crop production. In this review article, role of interactions between multi-symbiotic components and plantenvironment-symbiont relationships and the related biotechnology approaches are discussed in order to find the most effective sustainable and environmentally friendly agricultural practices to improve crop performance and mitigate the adverse effects of low temperatures on plants.

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Analysis of ecological attributes of bacterial phosphorus solubilizers, native to pine forests of Lower Himalaya

Cited by 18 publications

References 40 publications

Phosphorus Solubilization by Bacillus Species

Phosphorus Solubilization by Bacillus Species

Bacterial Subspecies Variation and Nematode Grazing Change P Dynamics in the Wheat Rhizosphere

Managing plant-environment-symbiont interactions to promote plant performance under low temperature stress

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