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179 results for “Rhizosphere”
Figure 3 in Isolation and characterization of Klebsiella oxytoca from the rhizosphere of Lotus corniculatus and its biostimulating features
Figure 3. Enhancement of the root and shoot lengths of barley when inoculated with LCK121, A.LCK121-treated ones; B.control seedlings.
Figure 2 in Isolation and characterization of Klebsiella oxytoca from the rhizosphere of Lotus corniculatus and its biostimulating features
Figure 2. Evolutionary relationships of LCK121 and other related bacterial species as inferred using the neighbor-joining method.
Figure 5 in Isolation and characterization of Klebsiella oxytoca from the rhizosphere of Lotus corniculatus and its biostimulating features
Figure 5. Enhancement of the root and shoot dry weight of barley when inoculated with LCK121. *Indicates a significant effect (P value <0.05).
Linked collectors and determiners for: Bacterial members of the Pinus pinaster rhizosphere microbiota in a forest subjected to drought conditions.
Natural history specimen data linked to collectors and determiners held within, "Bacterial members of the Pinus pinaster rhizosphere microbiota in a forest subjected to drought conditions". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/ffae417e-b2d8-476c-afe4-8c1093b67071">https://bionomia.net/dataset/ffae417e-b2d8-476c-afe4-8c1093b67071</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/ffae417e-b2d8-476c-afe4-8c1093b67071">https://gbif.org/dataset/ffae417e-b2d8-476c-afe4-8c1093b67071</a>. Formatted as a Frictionless Data package.
Differentiation of rhizosphere fungal assemblages by host ploidy level in mixed-ploidy Larrea tridentata populations
<p class="MsoNormal">Polyploidy—whole genome duplication—is common in plants. Studies over the last several decades have documented numerous mixed-ploidy populations. Whether arising via recurrent whole genome duplication events within a population, or from secondary contact, the persistence of mixed populations is possible by niche differentiation. Specifically, one mechanism facilitating ploidy co-occurrence is microbially-mediated niche differentiation (MMND), wherein cytotypes occupy different niches via interactions with different sets of microbes. Inherently cryptic, MMND is underexplored in polyploid plant populations. Here, we search for evidence of MMND in creosotebush (<em>Larrea tridentata</em>), a dominant desert shrub of the southwestern U.S. and northern Mexico. We sequenced root-associated fungal taxa in soil diploid, autotetraploid, and autohexaploid plants growing in two naturally-occurring mixed-cytotype populations. Within populations, we found substantial fungal assemblage overlap across host plant cytotypes. However, using indicator species analysis, we identified some fungi that are differentiated by host plant cytotype, satisfying a precondition for MMND. Future study is needed to determine the degree of niche differentiation conferred, if any, and whether the identified fungi play a role in the long-term persistence of multiple cytotypes within populations.</p>
Differentiation of rhizosphere fungal assemblages by host ploidy level in mixed-ploidy Larrea tridentata populations
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Metadata from: Rhizosphere bacteria and fungi are differentially structured by host plants, soil mineralogy and ectomycorrhizal communities in the Alaskan tundra
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Data from: The mechanism of promoting rhizosphere nutrient turnover for arbuscular mycorrhizal fungi attribute to recruited functional bacterial assembly
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Soil microbial activity and abundance data in the rhizosphere and bulk soils of O horizon in the MELNHE study, 2014
The Multiple Element Limitation in Northern Hardwood Ecosystems (MELNHE) project studies N and P acquisition and limitation through a series of nutrient manipulations in northern hardwood forests. This data set includes rhizosphere processes and microbial abundance at the Bartlett Experimental Forest. Samples were collected once, in summer 2014, in the forth year of fertilization with N and P. These data were gathered as part of the Hubbard Brook Ecosystem Study (HBES). The HBES is a collaborative effort at the Hubbard Brook Experimental Forest, which is operated and maintained by the USDA Forest Service, Northern Research Station.
Data from: Heterosis of leaf and rhizosphere microbiomes in field-grown maize
<p>Data and code associated with the submitted manuscript "<strong>Heterosis of leaf and rhizosphere microbiomes in field-grown maize</strong>". Detailed descriptions of each file can be found in the README.txt . The raw sequence data associated with this work can be downloaded from the NCBI Sequence Read Archive, listed under BioProject #PRJNA597058.</p>
Vegetation variables and rhizosphere bacterial communities from ten paired sites in southwestern Finland, 2021
<p>Plant invasions can have major impacts on ecosystems not only in aboveground but also in belowground through changes in microbiota. Particularly legumes, which often host nitrogen-fixing symbionts (rhizobia), can be expected to modify soil bacterial communities. We examined the effect of the invasive herbaceous legume, <em>Lupinus polyphyllus</em>, on the alpha diversity and community composition of soil bacteria. We also explored whether vegetation cover, the cover of other (non-invasive) legumes or number of vascular plants was associated with soil bacterial communities. We sampled rhizosphere soil and surveyed vegetation from ten paired sites (invaded more than ten years ago and uninvaded locations) in southwestern Finland, and identified bacterial DNA by using 16S rRNA gene amplicon sequencing. The plant invader and the three vegetation variables considered had no effect on soil bacterial alpha diversity in terms of bacterial richness, Shannon and Inverse Simpson diversity indices. The composition of soil bacterial communities differed between invaded and uninvaded soils at four out of the ten sites. However, the differences in the relative abundances of top bacterial families between the two soil origins were inconsistent across sites, including rhizobia in the family of <em>Bradyrhizobiaceae</em> that the study species is hosting. Moreover, vegetation cover, legume cover after excluding the study species, and number of plant species explained a small proportion of the variation in the bacterial community composition. Our findings indicate that <em>L</em><em>. polyphyllus</em> has the potential to modify the soil bacterial community composition locally, at least at sites where it has been present for more than a decade.</p>
Data from: Relationships between rhizosphere microbial communities, soil abiotic properties and root trait variation within a pine species
<p>Rhizosphere microbes play important roles in plant performance and ecosystem functioning. It is becoming increasingly clear that rhizosphere communities vary with soil properties and variation in root traits among plant species. However, less is known about whether and how variation in root traits within plant species influences the rhizosphere microbial communities.</p> <p>We evaluated the intraspecific root traits variation and explored their associations with bacterial and fungal communities in rhizosphere by focusing on an ectomycorrhizal tree<em> </em>species, i.e., <em>Pinus massoniana</em>, in 22 sites in subtropical China.</p> <p>The first dimension of the principal component analysis on root traits revealed evidence for the 'conservation' gradient of the root economics space. Overall, root traits explained more variation in fungal communities than in bacterial communities in the rhizosphere. Functional composition of rhizosphere microbial communities changed significantly along the 'conservation' gradient, with fast-growing copiotrophic bacteria and symbiotic ectomycorrhizal fungi were significantly enriched on the 'acquisition' side, while slow-growing oligotrophic bacteria were significantly enriched on the 'conservation' side of the gradient.</p> <p><strong><em>Synthesis</em></strong>: Our study demonstrates that intraspecific variation in plant roots significantly influence rhizosphere microbial communities, which in turn can influence plant nutrition and therefore plant performance within the community.</p>
Phages enhance both phytopathogen density control and rhizosphere microbiome suppressiveness
<p>Bacteriophages, viruses that specifically target plant pathogenic bacteria, have emerged as a promising alternative to traditional agrochemicals. However, it remains unclear how phages should be applied to achieve efficient pathogen biocontrol, and to what extent their efficacy is shaped by indirect interactions with the resident microbiota. Here we tested if the phage biocontrol efficacy of <em>Ralstonia solanacearum</em> phytopathogenic bacterium can be improved by increasing the phage cocktail application frequency, and if the phage efficacy is affected by pathogen-suppressing bacteria already present in the rhizosphere. We find that increasing phage application frequency improves <em>R. solanacearum</em> density control, leading to a clear reduction in bacterial wilt disease in both greenhouse and field experiments with tomatoes. The high phage application frequency also increased the diversity of resident rhizosphere microbiota and enriched several bacterial taxa that were associated with the reduction in pathogen densities. Interestingly, these taxa often belonged to <em>Actinobacteria</em> known for antibiotics production and soil suppressiveness. To test if they could have had secondary effects on <em>R. solanacearum </em>biocontrol, we isolated Actinobacteria from <em>Nocardia</em> and <em>Streptomyces</em> genera and tested their suppressiveness to the pathogen <em>in vitro</em> and <em>in planta</em>. We found that these taxa could clearly inhibit <em>R. solanacearum</em> growth and constrain bacterial wilt disease, especially when combined with the phage cocktail. Together, our findings unravel an undiscovered benefit of phage therapy, where phages trigger a second line of defense by the pathogen-suppressing bacteria that already exist in resident microbial communities.</p>
Figure 1 in Isolation and characterization of Klebsiella oxytoca from the rhizosphere of Lotus corniculatus and its biostimulating features
Figure 1. Pure colonies of the LCK121 strain from the rhizosphere of L. corniculatus.
Resprouting ability differs among plant functional groups along a soil acidification gradient in a meadow: A rhizosphere perspective
<p><span>Soil acidification as a global change factor can devastatingly affect plant growth and productivity. In frequently disturbed ecosystems, plant resprouting ability strongly determines biomass reconstruction and resilience after aboveground damage. However, how plant regrowth responds to soil acidification remains largely unknown, especially regarding the role of the rhizosphere in mediating this response. </span></p> <p><span>We manipulated a soil-acidification gradient via adding purified elemental sulfur powder at various rates (0-50 g S m<sup>−2</sup> year<sup>−1</sup>) in a frequently mown meadow. Shoot regrowth of functional groups were measured after clipping and supporting roles of rhizosphere versus bulk soils were disentangled using isotope labelling along the acidification gradient. </span></p> <p><span>Regrowth of grasses and sedges increased while forbs decreased along the acidification gradient. The results suggest that grasses were competitors capable of taking up nutrients from both rhizosphere and bulk soils, while sedges were acid-tolerators with lower sensitivity to decreased nitrogen-mineralization rates. Forbs, as typical ruderals, were vulnerable to N competition with microbes, particularly in the rhizosphere soil. Therefore, biomass regrowth of forbs was explained more by physicochemical and biological parameters from the rhizosphere than bulk soil</span></p> <p><span>Synthesis.</span><span> Divergent interplay between plant functional groups and rhizosphere soils was the prominent driver for biomass regrowth responding to soil acidification.</span></p>
Root functional traits determine the magnitude of the rhizosphere priming effect among eight tree species
<p><span>Rhizosphere priming effect </span>can accelerate or decelerate the decomposition of soil organic matter. Using a natural abundance <sup>13</sup>C tracer method allowing partitioning of native soil organic carbon (SOC) decomposition and plant rhizosphere respiration, we studied the effects of eight tree species on the strength of the rhizosphere priming. All tree species enhanced the rate of SOC decomposition, by 82% on average. <span>M</span><span>ean diameter of first-order roots and root exudate-derived respiration</span><span> were positively correlated with the RPE</span><span>, together explaining a large part of the observed variation in the RPE (<em>R<sup>2</sup></em> = 0.72), whereas root branching density was negatively associated with the RPE. Path analyses further suggested that mean diameter of first-order roots was the main driver of the RPE owing to its positive direct effect on the RPE and its indirect effects via root exudate-derived respiration and root branching density. </span>These results demonstrate that the magnitude of the RPE is regulated by complementary aspects of root morphology, architecture and physiology, implying that comprehensive approaches are needed to reveal the multiple mechanisms driving plant effects on the RPE.</p>
Data from: Relationships between rhizosphere microbial communities, soil abiotic properties and root trait variation within a pine species
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Fractions of soil phosphorus mediated by rhizospheric phoD-harboring bacteria of deep-rooted desert species are determined by fine-root traits
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Stimulated saprotrophic fungi in arable soil extend their activities to the rhizosphere and root microbiomes of crop seedlings
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Fungal, bacterial & plant biomass data: Evaluation of phenolic root exudates as stimulants of saprotrophic fungi in the rhizosphere
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