Stochastic processes shape the biogeographic variations in core bacterial communities between aerial and belowground compartments of common bean

Abstract

Although studies of biogeography in soil bacterial communities have attracted considerable attention, the generality of these patterns along with assembly processes and underlying drivers is poorly understood in the inner tissues of plants. Plant tissues provide unique ecological habitats for microorganisms, which play an essential role in plant performance. Here, we compared core bacterial communities among five soil–plant associated compartments of common bean across five sampling sites in China. Neutral and null modelling consistently suggested that stochastic processes dominated the core community assembly processes and escalated from the belowground compartments to the inner tissues of aerial plant parts. The multiple distance‐decay relationships also varied and had flattened patterns in the stem endosphere, which were shaped by distinct environmental factors in each compartment. Coexistence patterns also varied in topological features, in addition with the sparsest networks in the stem endosphere resulted from the interaction with the stochastic processes. This study considerably expanded our understanding of various biogeographic patterns, assembly processes, and the underlying mechanisms of core bacterial communities between aerial and belowground compartments of common bean. That will provide a scientific basis for the reasonable regulation of core bacterial consortia to get better plant performance.

Decreased spatial variation and deterministic processes of bacterial community assembly in the rhizosphere of Phragmites australis across the Middle–Lower Yangtze plain

“…In the present study, we found robust evidence for DDRs of bacterial communities in both bulk and rhizosphere sediment samples across the plain region (Figure 3), which is consistent with previous observations of different terrestrial ecosystems (Fan et al, 2017; Jiao et al, 2020; Liu et al, 2020; Wang et al, 2017; Zhang et al, 2018b). Furthermore, based on null model theory, we found that deterministic processes, especially variable selection, had dominant roles in driving the bacterial community assembly of lakeshore bulk sediment (Figure 4a).…”

Regulation of root secondary metabolites by partial root‐associated microbiotas under the shaping of licorice ecotypic differentiation in northwest China

“…The DDRs of the microbiotas in the present study were confirmed by the results of (partial) Mantel tests, and displayed similar patterns to those of other studies (Jiao and Lu, 2020;Liu et al, 2021). Moreover, the environmental factors were significantly correlated with the microbial communities in the BS and RS, which has also been found in previous studies (Xiong et al, 2012;Zhang et al, 2018).…”

“…The geography had the greatest direct effects on the bacterial communities in RS, which is in accordance with the results of the above Mantel tests (Table 4), and has been illustrated in other studies that have discussed the geographic distance has a greater impact on rhizosphere microbiotas due to the combined influences of plant root exudates (Xiong et al, 2012;Liu et al, 2021). It has become apparent that the biogeographic distance decay patterns of microbiotas in the root endosphere are usually not obvious (Zhang et al, 2018).…”

Intercropping Systems Modify Desert Plant-Associated Microbial Communities and Weaken Host Effects in a Hyper-Arid Desert

“…Soil compartments separated the rhizosphere bacterial community (α- and β- diversity) from the bulk soil under either planting pattern. Previous studies concerning other plant microbiomes also confirmed this partition ( Santhanam et al, 2015 ; Dombrowski et al, 2017 ; Fan et al, 2017 ; Liu et al, 2020 ). The rhizosphere is a highly dynamic environment that is the primary site of plant nutrient and other metabolite output, providing a rich source of C and energy for nearby microorganisms ( Dakora and Phillips, 2002 ; Bulgarelli et al, 2013 ).…”