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A Roldan - One of the best experts on this subject based on the ideXlab platform.
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striking alterations in the soil bacterial community structure and functioning of the biological n cycle induced by pennisetum setaceum invasion in a semiarid environment
Soil Biology & Biochemistry, 2017Co-Authors: G Rodriguezcaballero, F Caravaca, M M Alguacil, Manuel Fernandezlopez, Antonio Jose Fernandezgonzalez, A RoldanAbstract:Abstract The objective of this study was to determine whether native and invasive plants harbor different bacterial communities in their Rhizospheres and whether there are bacterial indicator species associated with the invasive Rhizosphere. Additionally, physico-chemical, biochemical, and biological properties have been determined in the native and invasive Rhizospheres in order to ascertain the relationships between these soil properties and the Rhizosphere bacterial communities. We carried out a study in five independent locations under Mediterranean semiarid conditions, where the native Hyparrhenia hirta is being displaced by Pennisetum setaceum. Partial 16S rRNA genes of the Rhizosphere bacterial communities were amplified and 454-pyrosequenced. Principal coordinate analysis revealed differences in the composition and structure of the Rhizosphere bacterial communities between native and invasive plants, the values of the richness index being higher in the invasive microbial community. Rhizosphere microbial community structure was also influenced by invaded location. The indicator species analysis showed a higher number of indicators for the invasive community at all the taxonomic levels studied, the genus Ohtaekwangia being the most abundant indicator. As shown by canonical correspondence analysis, the protease and dehydrogenase activities and soil respiration were related to the Rhizosphere bacterial community of invasive plant. However, only protease activity was significantly affected by the plant type, being higher in the invasive plant Rhizosphere. Our results show that P. setaceum invasion has produced an intense interaction with the soil bacterial community, shifting its structure, composition, and protease activity related to N cycling, which may be altering the function of the invaded ecosystem.
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arbuscular mycorrhizal fungi inoculation mediated changes in Rhizosphere bacterial community structure while promoting revegetation in a semiarid ecosystem
Science of The Total Environment, 2017Co-Authors: G Rodriguezcaballero, F Caravaca, M M Alguacil, Manuel Fernandezlopez, Antonio Jose Fernandezgonzalez, A RoldanAbstract:The main goal of this study was to assess the effect of the inoculation of four autochthonous shrub species with the arbuscular mycorrhizal (AM) fungus Rhizophagus intraradices on the Rhizosphere bacterial community and to ascertain whether such an effect is dependent on the host plant species. Additionally, analysis of Rhizosphere soil chemical and biochemical properties was performed to find relationships between them and the Rhizosphere bacterial communities. Non-metric multidimensional scaling analysis and subsequent permutational multivariate analysis of variance revealed differences in bacterial community composition and structure between non-inoculated and inoculated Rhizospheres. Moreover, an influence of the plant species was observed. Different bacterial groups were found to be indicator taxonomic groups of non-inoculated and inoculated Rhizospheres, Gemmatimonadetes and Anaerolineaceae, respectively, being the most notable indicators. As shown by distance based redundancy analysis, the shifts in bacterial community composition and structure mediated by the inoculation with the AM fungus were mainly related to changes in plant nutrients and growth parameters, such as the shoot phosphorus content. Our findings suggest that the AM fungal inoculum was able to modify the Rhizosphere bacterial community assemblage while improving the host plant performance.
G Rodriguezcaballero - One of the best experts on this subject based on the ideXlab platform.
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striking alterations in the soil bacterial community structure and functioning of the biological n cycle induced by pennisetum setaceum invasion in a semiarid environment
Soil Biology & Biochemistry, 2017Co-Authors: G Rodriguezcaballero, F Caravaca, M M Alguacil, Manuel Fernandezlopez, Antonio Jose Fernandezgonzalez, A RoldanAbstract:Abstract The objective of this study was to determine whether native and invasive plants harbor different bacterial communities in their Rhizospheres and whether there are bacterial indicator species associated with the invasive Rhizosphere. Additionally, physico-chemical, biochemical, and biological properties have been determined in the native and invasive Rhizospheres in order to ascertain the relationships between these soil properties and the Rhizosphere bacterial communities. We carried out a study in five independent locations under Mediterranean semiarid conditions, where the native Hyparrhenia hirta is being displaced by Pennisetum setaceum. Partial 16S rRNA genes of the Rhizosphere bacterial communities were amplified and 454-pyrosequenced. Principal coordinate analysis revealed differences in the composition and structure of the Rhizosphere bacterial communities between native and invasive plants, the values of the richness index being higher in the invasive microbial community. Rhizosphere microbial community structure was also influenced by invaded location. The indicator species analysis showed a higher number of indicators for the invasive community at all the taxonomic levels studied, the genus Ohtaekwangia being the most abundant indicator. As shown by canonical correspondence analysis, the protease and dehydrogenase activities and soil respiration were related to the Rhizosphere bacterial community of invasive plant. However, only protease activity was significantly affected by the plant type, being higher in the invasive plant Rhizosphere. Our results show that P. setaceum invasion has produced an intense interaction with the soil bacterial community, shifting its structure, composition, and protease activity related to N cycling, which may be altering the function of the invaded ecosystem.
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arbuscular mycorrhizal fungi inoculation mediated changes in Rhizosphere bacterial community structure while promoting revegetation in a semiarid ecosystem
Science of The Total Environment, 2017Co-Authors: G Rodriguezcaballero, F Caravaca, M M Alguacil, Manuel Fernandezlopez, Antonio Jose Fernandezgonzalez, A RoldanAbstract:The main goal of this study was to assess the effect of the inoculation of four autochthonous shrub species with the arbuscular mycorrhizal (AM) fungus Rhizophagus intraradices on the Rhizosphere bacterial community and to ascertain whether such an effect is dependent on the host plant species. Additionally, analysis of Rhizosphere soil chemical and biochemical properties was performed to find relationships between them and the Rhizosphere bacterial communities. Non-metric multidimensional scaling analysis and subsequent permutational multivariate analysis of variance revealed differences in bacterial community composition and structure between non-inoculated and inoculated Rhizospheres. Moreover, an influence of the plant species was observed. Different bacterial groups were found to be indicator taxonomic groups of non-inoculated and inoculated Rhizospheres, Gemmatimonadetes and Anaerolineaceae, respectively, being the most notable indicators. As shown by distance based redundancy analysis, the shifts in bacterial community composition and structure mediated by the inoculation with the AM fungus were mainly related to changes in plant nutrients and growth parameters, such as the shoot phosphorus content. Our findings suggest that the AM fungal inoculum was able to modify the Rhizosphere bacterial community assemblage while improving the host plant performance.
Kornelia Smalla - One of the best experts on this subject based on the ideXlab platform.
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effect of the soil type on the microbiome in the Rhizosphere of field grown lettuce
Frontiers in Microbiology, 2014Co-Authors: Susanne Schreiter, Guochun Ding, Holger Heuer, Ga Nter Neumann, Martin Sandmann, Rita Grosch, Siegfried Kropf, Kornelia SmallaAbstract:The complex and enormous diversity of microorganisms associated with plant roots is important for plant health and growth and is shaped by numerous factors. This study aimed to unravel the effects of the soil type on bacterial communities in the Rhizosphere of field-grown lettuce. We used an experimental plot system with three different soil types that were stored at the same site for 10 years under the same agricultural management to reveal differences directly linked to the soil type and not influenced by other factors such as climate or cropping history. Bulk soil and Rhizosphere samples were collected 3 and 7 weeks after planting. The analysis of 16S rRNA gene fragments amplified from total community DNA by denaturing gradient gel electrophoresis and pyrosequencing revealed soil type dependent differences in the bacterial community structure of the bulk soils and the corresponding Rhizospheres. The Rhizosphere effect differed depending on the soil type and the plant growth developmental stage. Despite the soil type dependent differences in the bacterial community composition several genera such as Sphingomonas, Rhizobium, Pseudomonas, and Variovorax were significantly increased in the Rhizosphere of lettuce grown in all three soils. The number of Rhizosphere responders was highest 3 weeks after planting. Interestingly, in the soil with the highest numbers of responders the highest shoot dry weights were observed. Heatmap analysis revealed that many dominant operational taxonomic units were shared among Rhizosphere samples of lettuce grown in diluvial sand, alluvial loam, and loess loam and that only a subset was increased in relative abundance in the Rhizosphere compared to the corresponding bulk soil. The findings of the study provide insights into the effect of soil types on the Rhizosphere microbiome of lettuce.
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dynamics of fungal communities in bulk and maize Rhizosphere soil in the tropics
Applied and Environmental Microbiology, 2003Co-Authors: Newton C M Gomes, Olajire Fagbola, Rodrigo Costa, Norma Gouvea Rumjanek, Arno Buchner, Leda Mendonahagler, Kornelia SmallaAbstract:The fungal population dynamics in soil and in the Rhizospheres of two maize cultivars grown in tropical soils were studied by a cultivation-independent analysis of directly extracted DNA to provide baseline data. Soil and Rhizosphere samples were taken from six plots 20, 40, and 90 days after planting in two consecutive years. A 1.65-kb fragment of the 18S ribosomal DNA (rDNA) amplified from the total community DNA was analyzed by denaturing gradient gel electrophoresis (DGGE) and by cloning and sequencing. A Rhizosphere effect was observed for fungal populations at all stages of plant development. In addition, pronounced changes in the composition of fungal communities during plant growth development were found by DGGE. Similar types of fingerprints were observed in two consecutive growth periods. No major differences were detected in the fungal patterns of the two cultivars. Direct cloning of 18S rDNA fragments amplified from soil or Rhizosphere DNA resulted in 75 clones matching 12 dominant DGGE bands. The clones were characterized by their HinfI restriction patterns, and 39 different clones representing each group of restriction patterns were sequenced. The cloning and sequencing approach provided information on the phylogeny of dominant amplifiable fungal populations and allowed us to determine a number of fungal phylotypes that contribute to each of the dominant DGGE bands. Based on the sequence similarity of the 18S rDNA fragment with existing fungal isolates in the database, it was shown that the Rhizospheres of young maize plants seemed to select the Ascomycetes order Pleosporales, while different members of the Ascomycetes and basidiomycetic yeast were detected in the Rhizospheres of senescent maize plants.
Antonio Jose Fernandezgonzalez - One of the best experts on this subject based on the ideXlab platform.
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striking alterations in the soil bacterial community structure and functioning of the biological n cycle induced by pennisetum setaceum invasion in a semiarid environment
Soil Biology & Biochemistry, 2017Co-Authors: G Rodriguezcaballero, F Caravaca, M M Alguacil, Manuel Fernandezlopez, Antonio Jose Fernandezgonzalez, A RoldanAbstract:Abstract The objective of this study was to determine whether native and invasive plants harbor different bacterial communities in their Rhizospheres and whether there are bacterial indicator species associated with the invasive Rhizosphere. Additionally, physico-chemical, biochemical, and biological properties have been determined in the native and invasive Rhizospheres in order to ascertain the relationships between these soil properties and the Rhizosphere bacterial communities. We carried out a study in five independent locations under Mediterranean semiarid conditions, where the native Hyparrhenia hirta is being displaced by Pennisetum setaceum. Partial 16S rRNA genes of the Rhizosphere bacterial communities were amplified and 454-pyrosequenced. Principal coordinate analysis revealed differences in the composition and structure of the Rhizosphere bacterial communities between native and invasive plants, the values of the richness index being higher in the invasive microbial community. Rhizosphere microbial community structure was also influenced by invaded location. The indicator species analysis showed a higher number of indicators for the invasive community at all the taxonomic levels studied, the genus Ohtaekwangia being the most abundant indicator. As shown by canonical correspondence analysis, the protease and dehydrogenase activities and soil respiration were related to the Rhizosphere bacterial community of invasive plant. However, only protease activity was significantly affected by the plant type, being higher in the invasive plant Rhizosphere. Our results show that P. setaceum invasion has produced an intense interaction with the soil bacterial community, shifting its structure, composition, and protease activity related to N cycling, which may be altering the function of the invaded ecosystem.
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arbuscular mycorrhizal fungi inoculation mediated changes in Rhizosphere bacterial community structure while promoting revegetation in a semiarid ecosystem
Science of The Total Environment, 2017Co-Authors: G Rodriguezcaballero, F Caravaca, M M Alguacil, Manuel Fernandezlopez, Antonio Jose Fernandezgonzalez, A RoldanAbstract:The main goal of this study was to assess the effect of the inoculation of four autochthonous shrub species with the arbuscular mycorrhizal (AM) fungus Rhizophagus intraradices on the Rhizosphere bacterial community and to ascertain whether such an effect is dependent on the host plant species. Additionally, analysis of Rhizosphere soil chemical and biochemical properties was performed to find relationships between them and the Rhizosphere bacterial communities. Non-metric multidimensional scaling analysis and subsequent permutational multivariate analysis of variance revealed differences in bacterial community composition and structure between non-inoculated and inoculated Rhizospheres. Moreover, an influence of the plant species was observed. Different bacterial groups were found to be indicator taxonomic groups of non-inoculated and inoculated Rhizospheres, Gemmatimonadetes and Anaerolineaceae, respectively, being the most notable indicators. As shown by distance based redundancy analysis, the shifts in bacterial community composition and structure mediated by the inoculation with the AM fungus were mainly related to changes in plant nutrients and growth parameters, such as the shoot phosphorus content. Our findings suggest that the AM fungal inoculum was able to modify the Rhizosphere bacterial community assemblage while improving the host plant performance.
M M Alguacil - One of the best experts on this subject based on the ideXlab platform.
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striking alterations in the soil bacterial community structure and functioning of the biological n cycle induced by pennisetum setaceum invasion in a semiarid environment
Soil Biology & Biochemistry, 2017Co-Authors: G Rodriguezcaballero, F Caravaca, M M Alguacil, Manuel Fernandezlopez, Antonio Jose Fernandezgonzalez, A RoldanAbstract:Abstract The objective of this study was to determine whether native and invasive plants harbor different bacterial communities in their Rhizospheres and whether there are bacterial indicator species associated with the invasive Rhizosphere. Additionally, physico-chemical, biochemical, and biological properties have been determined in the native and invasive Rhizospheres in order to ascertain the relationships between these soil properties and the Rhizosphere bacterial communities. We carried out a study in five independent locations under Mediterranean semiarid conditions, where the native Hyparrhenia hirta is being displaced by Pennisetum setaceum. Partial 16S rRNA genes of the Rhizosphere bacterial communities were amplified and 454-pyrosequenced. Principal coordinate analysis revealed differences in the composition and structure of the Rhizosphere bacterial communities between native and invasive plants, the values of the richness index being higher in the invasive microbial community. Rhizosphere microbial community structure was also influenced by invaded location. The indicator species analysis showed a higher number of indicators for the invasive community at all the taxonomic levels studied, the genus Ohtaekwangia being the most abundant indicator. As shown by canonical correspondence analysis, the protease and dehydrogenase activities and soil respiration were related to the Rhizosphere bacterial community of invasive plant. However, only protease activity was significantly affected by the plant type, being higher in the invasive plant Rhizosphere. Our results show that P. setaceum invasion has produced an intense interaction with the soil bacterial community, shifting its structure, composition, and protease activity related to N cycling, which may be altering the function of the invaded ecosystem.
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arbuscular mycorrhizal fungi inoculation mediated changes in Rhizosphere bacterial community structure while promoting revegetation in a semiarid ecosystem
Science of The Total Environment, 2017Co-Authors: G Rodriguezcaballero, F Caravaca, M M Alguacil, Manuel Fernandezlopez, Antonio Jose Fernandezgonzalez, A RoldanAbstract:The main goal of this study was to assess the effect of the inoculation of four autochthonous shrub species with the arbuscular mycorrhizal (AM) fungus Rhizophagus intraradices on the Rhizosphere bacterial community and to ascertain whether such an effect is dependent on the host plant species. Additionally, analysis of Rhizosphere soil chemical and biochemical properties was performed to find relationships between them and the Rhizosphere bacterial communities. Non-metric multidimensional scaling analysis and subsequent permutational multivariate analysis of variance revealed differences in bacterial community composition and structure between non-inoculated and inoculated Rhizospheres. Moreover, an influence of the plant species was observed. Different bacterial groups were found to be indicator taxonomic groups of non-inoculated and inoculated Rhizospheres, Gemmatimonadetes and Anaerolineaceae, respectively, being the most notable indicators. As shown by distance based redundancy analysis, the shifts in bacterial community composition and structure mediated by the inoculation with the AM fungus were mainly related to changes in plant nutrients and growth parameters, such as the shoot phosphorus content. Our findings suggest that the AM fungal inoculum was able to modify the Rhizosphere bacterial community assemblage while improving the host plant performance.
