A Degeneration Gradient of Poplar Trees Contributes to the Taxonomic, Functional, and Resistome Diversity of Bacterial Communities in Rhizosphere Soils

Liu, Juan; He, Xiangwei; Sun, Jing; Ma, Yue

doi:10.3390/ijms22073438

Cited by 17 publications

(7 citation statements)

References 78 publications

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“…The top discriminative features are shown in Figure 5 . Of these, the classifiable genus-level features differentially more abundant in OL were: Acidibacter , highly tolerant to transition metals, as well as to arsenic [ 99 ]; Acidobacterium , related to organic matter transformation in forest soils [ 100 ], which is considered an indicator for soil fertility and plant health [ 101 ]; Desulfohalophilus , described as extreme halophilic sulfate- and arsenate-respiring bacteria [ 102 ]; Edaphobacter , whose presence has been reported in heavy metal contaminated soils [ 103 ] and more recently indicated as a potential source for bioelectricity production from sludge matrices [ 104 ]; and Paraburkholderia , identified as the main nitrogen-fixing microsymbionts of Mimosa tenuiflora from Caatinga (tropical dry forests) [ 105 ]. Actinokineospora was differentially more abundant in OH.…”

Section: Resultsmentioning

confidence: 99%

The Nexus between Fire and Soil Bacterial Diversity in the African Miombo Woodlands of Niassa Special Reserve, Mozambique

et al. 2021

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(1) Background: the Miombo woodlands comprise the most important vegetation from southern Africa and are dominated by tree legumes with an ecology highly driven by fires. Here, we report on the characterization of bacterial communities from the rhizosphere of Brachystegia boehmii in different soil types from areas subjected to different regimes. (2) Methods: bacterial communities were identified through Illumina MiSeq sequencing (16S rRNA). Vigna unguiculata was used as a trap to capture nitrogen-fixing bacteria and culture-dependent methods in selective media were used to isolate plant growth promoting bacteria (PGPB). PGP traits were analysed and molecular taxonomy of the purified isolates was performed. (3) Results: Bacterial communities in the Miombo rhizosphere are highly diverse and driven by soil type and fire regime. Independent of the soil or fire regime, the functional diversity was high, and the different consortia maintained the general functions. A diverse pool of diazotrophs was isolated, and included symbiotic (e.g., Mesorhizobium sp., Neorhizobium galegae, Rhizobium sp., and Ensifer adhaerens), and non-symbiotic (e.g., Agrobacterium sp., Burkholderia sp., Cohnella sp., Microvirga sp., Pseudomonas sp., and Stenotrophomonas sp.) bacteria. Several isolates presented cumulative PGP traits. (4) Conclusions: Although the dynamics of bacterial communities from the Miombo rhizosphere is driven by fire, the maintenance of high levels of diversity and functions remain unchanged, constituting a source of promising bacteria in terms of plant-beneficial activities such as mobilization and acquisition of nutrients, mitigation of abiotic stress, and modulation of plant hormone levels.

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Section: Resultsmentioning

confidence: 99%

The Nexus between Fire and Soil Bacterial Diversity in the African Miombo Woodlands of Niassa Special Reserve, Mozambique

et al. 2021

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“…PGPB has shown that they can maintain genes for antibiotic and metal resistance [ 43 ]. In addition, some research has indicated that antibiotic resistance in plants can be a significant concern in the use of PGPB in agriculture [ 44 ].…”

Section: Plant Beneficial Microorganismsmentioning

confidence: 99%

Microbial seed coating: An attractive tool for sustainable agriculture

Paravar

Piri

Balouchi

et al. 2023

Biotechnology Reports

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“…Further, as the rhizosphere of the infected tree begins to degrade, these taxa may thrive because of their unique abilities to breakdown complex plant root materials. Several studies have observed changes in bacterial communities associated with declines in plant communities [122][123][124].…”

Section: Discussionmentioning

confidence: 99%

Genomic Comparisons of Two Armillaria Species with Different Ecological Behaviors and Their Associated Soil Microbial Communities

et al. 2022

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Armillaria species show considerable variation in ecological roles and virulence, from mycorrhizae and saprophytes to important root pathogens of trees and horticultural crops. We studied two Armillaria species that can be found in coniferous forests of northwestern USA and southwestern Canada. Armillaria altimontana is considered as a weak, opportunistic pathogen of coniferous trees, but it also appears to exhibit in situ biological control against A. solidipes, formerly North American A. ostoyae, which is considered a virulent pathogen of coniferous trees. Here, we describe their genome assemblies and present a functional annotation of the predicted genes and proteins for the two Armillaria species that exhibit contrasting ecological roles. In addition, the soil microbial communities were examined in association with the two Armillaria species within a 45-year-old plantation of western white pine (Pinus monticola) in northern Idaho, USA, where A. altimontana was associated with improved tree growth and survival, while A. solidipes was associated with reduced growth and survival.ostoyae) is considered one of the more virulent pathogens [13], although virulence varies depending on isolate, host age and other factors [14]. Armillaria mellea and A. borealis are also considered virulent pathogens, while A. gallica, A. cepistipes, A. gemina, A. calvescens, A. sinapina, and A. nabsnona are considered less virulent or secondary pathogens [10, 12,15, 16]. A recently described species, Armillaria altimontana, formerly North American biological species (NABS) X, is also usually considered as a weak pathogen [17], but evidence for pathogenicity is not well documented [18]. Armillaria solidipes (as A. ostoyae) and A. altimontana have been documented to co-occur within forest stands in the inland northwestern USA [18][19][20]. A previous study in northern Idaho, USA provided evidence that A. altimontana can provide natural biological control of Armillaria root disease of western white pine (Pinus monticola) caused by A. solidipes. In this study, A. solidipes was uncommon in areas dominated by A. altimontana, and trees colonized by A. solidipes were associated with a lower growth and survival than trees colonized only by A. altimontana. The results demonstrated that A. altimontana was not harmful to western white pine within the northern Idaho planting site, and further suggest that A. altimontana behaves as a long-term, in situ biological control agent against A. solidipes [20]. Recognizing the genetic or underlying soil factors that drive host-fungal interactions may provide approaches for enhancing the management of Armillaria root disease.The distribution, life cycle, pathogenicity, and evolutionary relationships have been studied for several Armillaria species [10, 12,14, 16,[21][22][23][24][25]. Collins et al. [26] studied the genome and proteome of A. mellea, identifying carbohydrate degrading enzymes, laccases, and lignin peroxidases among other geneencoded proteins. characterized the transcriptome of an A. solidipe...

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A Degeneration Gradient of Poplar Trees Contributes to the Taxonomic, Functional, and Resistome Diversity of Bacterial Communities in Rhizosphere Soils

Cited by 17 publications

References 78 publications

The Nexus between Fire and Soil Bacterial Diversity in the African Miombo Woodlands of Niassa Special Reserve, Mozambique

The Nexus between Fire and Soil Bacterial Diversity in the African Miombo Woodlands of Niassa Special Reserve, Mozambique

Microbial seed coating: An attractive tool for sustainable agriculture

Genomic Comparisons of Two Armillaria Species with Different Ecological Behaviors and Their Associated Soil Microbial Communities

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