Microbial community structure in rhizosphere soil rather than that in bulk soil characterizes aggregate-associated organic carbon under long-term forest conversion in subtropical region

Rhizosphere ◽  
2021 ◽  
Vol 20 ◽  
pp. 100438
Author(s):  
Rudong Zhao ◽  
Mei He ◽  
Canlan Jiang ◽  
Chengliang Li ◽  
Feng Liu
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
Organic Carbon ◽  
Microbial Community Structure ◽  
Rhizosphere Soil ◽  
Bulk Soil ◽  
Forest Conversion ◽  
Subtropical Region

Host ancestry and morphology differentially influence bacterial and fungal community structure of Rhododendron leaves, roots, and soil

Botany ◽  
2021 ◽  
Author(s):  
Juliana S Medeiros ◽  
Michael A Mann ◽  
Jean H. Burns ◽  
Sarah Kyker ◽  
David Burke
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
Microbial Community Structure ◽  
Fungal Community ◽  
Root Morphology ◽  
Rhizosphere Soil ◽  
Ornamental Plants ◽  
Fungal Communities ◽  
Bulk Soil ◽  
Fungal Community Structure

Rhododendron are popular ornamental plants which are well-known for forming mycorrhizal associations with ericoid fungi, but little is known about how host traits influence their microbiome more broadly. This study investigated leaf, root, rhizosphere soil, and bulk soil bacterial and fungal community structure for 12 Rhododendron species, representing four taxonomic clades with different leaf habits. Samples were collected when ephemeral hair roots colonized by ericoid mycorrhizae were absent, and microbial community structure was compared to leaf and root morphology for the same plants. Root morphology and the fungal communities of roots and rhizosphere soil were primarily structured by host ancestry. Leaf bacterial and fungal communities were even more distinct across clades than for roots or rhizosphere, and microbial communities of leaves and bulk soil were similarly structured by clade-wise differences in leaf morphology, suggesting a role for Rhododendron leaf litter in belowground microbial community structure. This work sheds new light on host traits influencing microbial community structure of ericaceous plants, showing a strong influence of ancestry, but also that different host traits drive bacterial and fungal communities across different plant compartments, suggesting future work on factors that drive similarity among close relatives in the non-ericoid microbes associating with Rhododendron.

scholarly journals Coupled changes in soil organic carbon fractions and microbial community composition in urban and suburban forests

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Xueying Zhang ◽  
Xiaomei Chen ◽  
Muying Liu ◽  
Zhanying Xu ◽  
Hui Wei
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Community Composition ◽  
Microbial Community Structure ◽  
Soil Microorganisms ◽  
Microbial Community Composition ◽  
Soil C ◽  
Suburban Forests

Abstract Climate change and rapid urbanization have greatly impacted urban forest ecosystems and the carbon (C) cycle. To assess the effects of urbanization on forest soil C and soil microorganisms, six natural forests in a highly-urbanized region were selected as the research objects. Soil samples were collected to investigate the content and fractions of the soil organic carbon (SOC), as well as the soil microbial community composition. The results showed that the SOC content and fractions were substantially lower in the urban forests than in the suburban forests. Meanwhile, the total amount of phospholipid fatty acids (PLFAs) at suburban sites was twice more than that at urban sites, with shifts in microbial community structure. The potential differences in C inputs and nutrient limitation in urban forests may aggravate the low quantity and quality of SOC and consequently impact microbial community abundance and structure. Variation in microbial community structure was found to explain the loss of soil C pools by affecting the C inputs and promoting the decomposition of SOC. Therefore, the coupled changes in SOC and soil microorganisms induced by urbanization may adversely affect soil C sequestration in subtropical forests.

scholarly journals Faecal Microbiota Dynamics and their Relation to Disease Course in Crohn’s Disease

2019 ◽  
Vol 13 (10) ◽  
pp. 1273-1282 ◽  
Author(s):  
Gianluca Galazzo ◽  
Danyta I Tedjo ◽  
Dion S J Wintjens ◽  
Paul H M Savelkoul ◽  
Ad A M Masclee ◽  
...  
Keyword(s):  
Crohn’S Disease ◽  
Community Structure ◽  
Microbial Community ◽  
Disease Activity ◽  
Microbial Community Structure ◽  
Disease Course ◽  
Microbiota Composition ◽  
Faecal Microbiota ◽  
Over Time

Abstract Background Microbial shifts have been associated with disease activity in Crohn’s disease [CD], but findings on specific taxa are inconsistent. This may be due to differences in applied methods and cross-sectional study designs. We prospectively examined the faecal microbiota in adult CD patients with changing or stable disease course over time. Methods Faeces were collected at two time-points from 15 healthy control individuals [HCs], 35 CD patients who were in remission and who maintained remission [RRs], and 22 CD patients during remission and also during subsequent exacerbation [RAs]. The microbial composition was assessed by 16S rRNA [V4] gene sequencing. Results Compared with HCs, patients with CD had a lower microbial richness [p = 0.0002] and diversity [p = 0.005]. Moreover, the microbial community structure of a subset of patients, clustered apart from HCs, was characterized by low microbial diversity and Faecalibacterium abundance. Patients within this cluster did not differ with respect to long-term disease course compared with patients with a ‘healthy-appearing’ microbiota. Over time, microbial richness and diversity did not change in RR versus RA patients. Although the microbial community structure of both RR and RA patients was less stable over time compared with that of HCs, no differences were observed between the patient groups [p = 0.17]; nor was the stability impacted by Montreal classification, medication use, or surgery. Conclusion The altered microbiota composition and stability in CD was neither associated with disease activity nor long-term disease course, questioning its involvement in the development of an exacerbation. The aberrant microbiota composition in a subset of CD patients warrants further exploration of a more microbiota-driven etiology in this group.

Sign in / Sign up

Export Citation Format

Share Document