Endophytic bacteria: Prospects and applications for the phytoremediation of organic pollutants

Afzal, Muhammad; Khan, Qaiser M.; Sessitsch, Angela

doi:10.1016/j.chemosphere.2014.06.078

Cited by 330 publications

(155 citation statements)

References 135 publications

(221 reference statements)

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“…However, the differences in terms of diversity and relative abundance of taxa between Espeletia leaf phyllosphere communities and necromass and root communities suggest niche-selective properties. Overall, the presence of shared taxa across plant tiers indicates that these communities are interconnected and that bacteria can travel from the rhizosphere toward the leaves and vice versa, as has been reported previously (13,58,59). The high diversity observed in terms of bacterial composition and functional potential for both the necromass and root fractions is consistent with the fact that these communities are shaped by factors that contrast with those affecting phyllosphere communities.…”

Section: Figsupporting

confidence: 82%

Microbial and Functional Diversity within the Phyllosphere of Espeletia Species in an Andean High-Mountain Ecosystem

Ruiz-Pérez

Restrepo

Zambrano

2016

Appl Environ Microbiol

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c Microbial populations residing in close contact with plants can be found in the rhizosphere, in the phyllosphere as epiphytes on the surface, or inside plants as endophytes. Here, we analyzed the microbiota associated with Espeletia plants, endemic to the Páramo environment of the Andes Mountains and a unique model for studying microbial populations and their adaptations to the adverse conditions of high-mountain neotropical ecosystems. Communities were analyzed using samples from the rhizosphere, necromass, and young and mature leaves, the last two analyzed separately as endophytes and epiphytes. The taxonomic composition determined by performing sequencing of the V5-V6 region of the 16S rRNA gene indicated differences among populations of the leaf phyllosphere, the necromass, and the rhizosphere, with predominance of some phyla but only few shared operational taxonomic units (OTUs). Functional profiles predicted on the basis of taxonomic affiliations differed from those obtained by GeoChip microarray analysis, which separated community functional capacities based on plant microenvironment. The identified metabolic pathways provided insight regarding microbial strategies for colonization and survival in these ecosystems. This study of novel plant phyllosphere microbiomes and their putative functional ecology is also the first step for future bioprospecting studies in search of enzymes, compounds, or microorganisms relevant to industry or for remediation efforts.A ndean high-mountain environments have been reported as diversity hot spots, mainly because of their endemic species (1). The Paramos ecosystems within the Neotropical Andes consist of isolated, high-elevation areas that are reported to be the world's fastest-evolving biodiversity hot spot (2). These ecosystems are exposed to harsh environmental conditions, such as high incidence of UV radiation (3) and daily shifts in temperatures that impose selective pressure on native plants and their associated microbiota (4). In particular, the phyllosphere of endemic plants from Paramos represents a unique ecosystem for microbial communities with diverse and distinctive abilities to survive under conditions considered extreme for other forms of life.The phyllosphere refers to all aboveground surfaces of any plant, including leaves, stems, buds, flowers, and fruits (5). It acts as a landing stage where spores or other propagules can develop and multiply (6) and has been reported as probably the largest ecosystem on earth colonized by microorganisms, mainly bacteria and fungi (7). Interest in studying the phyllosphere microbiota is growing due to its potential in terms of microbial interactions, survival under harsh environmental, nutrient or humidity conditions, and bioprospecting. The most emblematic plant in the Colombian Paramos is known as "frailejón," a plant endemic to the region and belonging to the genus Espeletia (8, 9). These plants have unique adaptations that enable them to resist exposure to UV light and daily temperature changes; they are in close ...

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Section: Figsupporting

confidence: 82%

Microbial and Functional Diversity within the Phyllosphere of Espeletia Species in an Andean High-Mountain Ecosystem

Ruiz-Pérez

Restrepo

Zambrano

2016

Appl Environ Microbiol

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“…A interação entre a raiz e o solo promove a proliferação da comunidade microbiana na região da rizosfera, pela exsudação de aminoácidos e polissacarídeos pela planta (Yousaf et al, 2011;Khan et al, 2013;Afzal et al, 2014), o que permite à rizosfera apresentar grande potencial para degradação de agrotóxico.…”

Section: Methodsunclassified

O herbicida sulfentrazone interfere na biomassa microbiana e na atividade da microbiota do solo

Madalão¹,

Silva²,

Orlando³

et al. 2016

RCA

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“…While bacteria can maintain contact with their host plant from the endosphere, phyllosphere, or rhizosphere, the first interface is likely to ensure a very intimate plantbacteria relationship. Endophytic bacteria reside within the internal plant tissues without inflicting infection or other negative effects (Afzal et al 2014a;Schulz and Boyle 2006;Yousaf et al 2014). This, in most of the cases, is a mutualistic association, where endophytic bacteria benefit from host's capability to provide nutrients and residence while the plant enjoys an improvement in its health and growth by bacterially-derived hormones and beneficial enzymes (e.g., ACC-deaminase); enhanced availability of nutrients (nitrogen, phosphorus); and a better resistance toward pathogenic attack (antibiotics, cell-wall degrading enzymes, siderophores etc.)…”

Section: Introductionmentioning

confidence: 99%

Phytoremediation: recent advances in plant-endophytic synergistic interactions

et al. 2015

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Background Plant-endophyte partnership provides an excellent gateway toward restoration of contaminated ecosystems. The interactions between both partners can be manipulated by introducing novel catabolic/ metabolic genes into host plant or endophytic bacteria genomes. The potential of the engineered organisms to degrade or accumulate contaminants is much wider than their wild relatives. Scope This review covers the recent developments for engineering catabolic/metabolic genes from a wide range of sources into plants or endophytic bacteria for the development of modified plant-endophyte interactions. Genetic alteration of plants promises enhanced catabolism by plant's own enzymatic machinery or greater contaminant uptake/accumulation for subsequent in planta detoxification by complementary endophytes. On the other hand, bacteria may also be engineered to enhance the potential for degradation or alteration of catabolic pathways, either to protect the host plant against phytotoxicity or to improve the overall efficiency of phytoremediation in planta, a situation especially suitable when hydrophilic compounds fail to be degraded by rhizospheric microbes due to the rapid uptake by plants. This is followed by discussion on kinetic parameters controlling phytoremediation. Conclusions It is hypothesized that transgenic approach can result in synergistic and effective plant-endophyte partnerships for wider-range and enhanced capabilities of degrading and/or detoxifying contaminants.

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Endophytic bacteria: Prospects and applications for the phytoremediation of organic pollutants

Cited by 330 publications

References 135 publications

Microbial and Functional Diversity within the Phyllosphere of Espeletia Species in an Andean High-Mountain Ecosystem

Microbial and Functional Diversity within the Phyllosphere of Espeletia Species in an Andean High-Mountain Ecosystem

O herbicida sulfentrazone interfere na biomassa microbiana e na atividade da microbiota do solo

Phytoremediation: recent advances in plant-endophytic synergistic interactions

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