Biodegradation of naphthalene mediated by the plant growth promoting rhizobacteria

Abstract

We compared the ability of two bacterial strains, Paenibacillus polymyxa A26 and P. polymyxa A26Sfp, for biodegradation of naphthalene (NAP). The studies were performed under simulated laboratory conditions, in liquid medium and soil with different carbon sources, pH and salt contents. Changes in the luminescence inhibition of Aliivibrio fischeri, as an indicator of the baseline toxicity, were observed in degradation mixtures during 7 days of incubation. While both strains expressed the best growth and NAP degradation ability in the minimal salt medium containing sucrose and 5% NaCl at pH 8, the mutant strain remained effective even under extreme conditions. A26Sfp was found to be an efficient and potentially industrially important polycyclic aromatic hydrocarbon degradation strain. Its extracellular polysaccharide production is 30% and glucan production twice that of the wild type A 26. The surface tension reduction ability was ascertained as 25 to 30% increased emulsification ability.

The species richness of theSalix viminalisrhizosphere at the Stebnyk tailings storages is dependent on supplementation from theSalicornia europaearhizosphere

“…Unlike the genes and regulatory regions of the genome, microbial composition can be rapidly modified by environmental cues, and may thus represent a mechanism for rapid acclimation and adaptations of individuals to a changing environment. Recently, we proposed the microbiota-mediated acclimatization concept, suggesting that changes in microbiota that originate from severe drought stress enable modern wheat cultivars to tolerate drought stress (Timmusk and Wagner 1999, Timmusk, Abd El-Daim et al 2014, Timmusk and Zucca 2019, Timmusk, Pall et al 2023. By the similar token here we hypothesize that the bacteria that have lived for long periods under HM and salt pollution stress have acquired the ability to tolerate the pollution; and are suitable for supporting bioremediation processes.…”

“…Hence, the ability to manage the soil microbiome under pollution stress is likely to be the key to efficient bioremediation (Batista and Singh 2021). Since rhizobacteria were first described (Hiltner 1904), single microbial isolates as well as microbial consortia have been used over decades for inoculation to influence the host plants to remediate various stress situations (Bashan 1998, Timmusk and Wagner 1999, de-Bashan, Hernandez et al 2012, Glick 2012, Timmusk, Abd El-Daim et al 2014, Ray, Lakshmanan et al 2020. Environmental remediation using microbial inocula has several advantages over artificial chemical treatments (Sonawane, Rai et al 2022, Tufail, Iltaf et al 2022.…”

The Effectiveness Of Pre-Planting Seeds Bio-Matriconditioning And Application Of Fertilization With Leisa Technique On Growth Of Areca Nut Seedling (Areca Catechu L.)

“…is a group of PGPR (Plant Growth Promoting Rhizobacteria) that are effective in increasing plant growth and yield. The role of these endophytic-rhizobacteria as PGPR is because these bacteria have the ability to dissolve phosphate, fix nitrogen, and produce growth hormones such as IAA and cytokinins 21 . The results of previous studies that are relevant to this study indicate that the use of biological agents can increase seed germination 22,23,24,25 .In addition to the improvements caused by the use of endophytic-rhizobacteria independently, the application of biomatriconditioning techniques as a medium for inoculation of rhizobacteria in seeds also provides a positive role that cannot be ignored.…”