Salinity Is a Key Determinant for Soil Microbial Communities in a Desert Ecosystem

Zhang, Kaoping; Shi, Yu; Cui, Xiaoqing; Yue, Ping; Li, Kaihui; Liu, Xuejun; Tripathi, Binu M.; Chu, Haiyan

doi:10.1128/msystems.00225-18

Cited by 258 publications

(166 citation statements)

References 55 publications

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“…This is might be due to the influence of some large tidal events [7]. Nevertheless, these results are in accordance with the findings of previous studies, where salinity was described as a predominant factor in determining microbial biogeography [43][44][45][46][47]. This is possible due to the divergent adaptation of the core metabolic functions like respiration, biosynthesis of quinones and isoprenoids, glycolysis, and osmolyte transport to different salinity environments [48,49].…”

Section: Discussionsupporting

confidence: 91%

Environmental Filtering Drives the Assembly of Habitat Generalists and Specialists in the Coastal Sand Microbial Communities of Southern China

Wang

Cao

et al. 2019

Microorganisms

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Coastal sands harbor diverse microbial assemblages that play a critical role in the biogeochemical cycling of beach ecosystems. However, little is known about the relative importance of the different ecological processes underlying the assembly of communities of sand microbiota. Here, we employed 16S rDNA amplicon sequencing to investigate the sand microbiota of two coastal beaches, in southern China. The results showed that sand microbial assemblages at intertidal and supratidal zones exhibited contrasting compositions that can be attributed to environmental filtering by electric conductivity. A consistent pattern of habitat generalists and specialists of sand microbiota was observed among different beach zones. Null and neutral model analyses indicated that the environmental filtering was mainly responsible for supratidal microbial communities, while the neutral processes could partially influence the assembly of intertidal communities. Moreover, environmental filtering was found to shape the habitat specialists, while random dispersal played a major role in shaping generalists. The neutral model analysis revealed that the habitat generalists exceeding the neutral prediction harbored a relatively higher proportion of microbial taxa than the specialist counterparts. An opposite pattern was observed for taxa falling below the neutral prediction. Collectively, these findings offer a novel insight into the assembly mechanisms of coastal sand microbiota.

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Section: Discussionsupporting

confidence: 91%

Environmental Filtering Drives the Assembly of Habitat Generalists and Specialists in the Coastal Sand Microbial Communities of Southern China

Wang

Cao

et al. 2019

Microorganisms

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“…Environmental filtering is a key determinant of community assembly (Kraft et al ., ) and has been shown to cause phylogenetic clustering in bacterial communities (Horner‐Devine and Bohannan, ). Many studies have shown that soil pH, OMs and salinity can influence bacterial community assembly processes in various environments (Dini‐Andreote et al ., ; Feng et al ., ; Tripathi et al ., ; Zhang et al ., ). Here, we showed that soil pH and MAT mediated the balance between stochastic and deterministic assembly for abundant and rare sub‐communities, respectively, in agro‐ecosystems.…”

Section: Discussionmentioning

confidence: 97%

Soil pH and temperature regulate assembly processes of abundant and rare bacterial communities in agricultural ecosystems

Jiao

2019

Environmental Microbiology

252

151

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Summary The factors determining stochastic and deterministic processes that drive microbial community structure, specifically the balance of abundant and rare bacterial taxa, remain underexplored. Here we examined biogeographic patterns of abundant and rare bacterial taxa and explored environmental factors influencing their community assembly processes in agricultural fields across eastern China. More phylogenetic turnover correlating with spatial distance was observed in abundant than rare sub‐communities. Homogeneous selection was the main assembly process for both the abundant and rare sub‐communities; however, the abundant sub‐community was more tightly clustered phylogenetically and was more sensitive to dispersal limitations than the rare sub‐community. Rare sub‐community of rice fields and abundant sub‐community of maize fields were more governed by stochastic assembly processes, which showed higher operational taxonomic unit richness. We propose a conceptual paradigm wherein soil pH and mean annual temperature mediate the assembly of the abundant and rare sub‐communities respectively. A higher soil pH leads to deterministic assembly of the abundant sub‐community. For the rare sub‐community, the dominance of stochasticity in low‐temperature regions indicates weaker niche‐based exclusion and the arrival of more evolutionary lineages. These findings suggest that the community assembly processes for abundant and rare bacterial taxa are dependent on distinct environmental variables in agro‐ecosystems.

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“…Salinity-induced changes in community structure and adverse effects on microbial density, activity, biomass were reported by many scientists (Yan et al, 2015, Zhang et al, 2019). The decrease in number of culturable microorganisms related to increasing NaCl concentration was noted even in the case of endophytes associated with halophytes ( Aster tripolium , Salicornia europaea ) (Szymańska et al, 2013; Szymańska et al, 2016).…”

Section: Discussionmentioning

confidence: 89%

Effect of osmoprotectants on the survival of bacterial endophytes in lyophilized beet roots

Szymańska

Sikora

Hrynkiewicz

et al. 2019

Preprint

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The increase of human population and associated increasing demand for agricultural products lead to soil over-exploitation. Biofertilizers based on lyophilized plant material containing living plant growth-promoting microorganisms (PGPM) could be an alternative to conventional fertilizers that fits into sustainable agricultural technologies ideas. We aimed to: (i) assess the diversity of endophytic bacteria in beet roots and (ii) determine the influence of osmoprotectants addition during lyophilization on bacterial density, viability, salt tolerance. Microbiome diversity was assessed based on 16S rRNA amplicons sequencing, bacterial density and salt tolerance was evaluated in cultures, while bacterial viability was calculated by using fluorescence microscopy and flow cytometry. Here we show that plant genotype shapes its endophytic microbiome diversity and determines physicochemical rhizosphere soil properties. Sea beet endophytic microbiome, consisting of genera characteristic for extreme environments, is more diverse and salt resistant than its crop relative. Supplementing osmoprotectants during root tissue lyophilization exerts a positive effect on bacterial community salt stress tolerance, viability and density. Trehalose improves these parameters more effectively than ectoine, moreover its use is economically advantageous.

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Salinity Is a Key Determinant for Soil Microbial Communities in a Desert Ecosystem

Cited by 258 publications

References 55 publications

Environmental Filtering Drives the Assembly of Habitat Generalists and Specialists in the Coastal Sand Microbial Communities of Southern China

Environmental Filtering Drives the Assembly of Habitat Generalists and Specialists in the Coastal Sand Microbial Communities of Southern China

Soil pH and temperature regulate assembly processes of abundant and rare bacterial communities in agricultural ecosystems

Effect of osmoprotectants on the survival of bacterial endophytes in lyophilized beet roots

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