Dynamics of the rice rhizosphere microbial community under continuous and intermittent flooding treatment

Li, Hailong; Yu, Yong; Guo, Jingxia; Li, Xiangzhen; Rensing, Christopher; Guo, Wenhui

doi:10.1016/j.jenvman.2019.109326

Cited by 20 publications

(6 citation statements)

References 34 publications

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“…At the phylum level, the orders of primary bacteria and microbial α diversity in the rhizosphere soils of all treatments were similar 15 , 30 . This is likely due to community readjustment, as some metal-sensitive bacteria increase, and some resistant bacteria decrease as Cd concentrations change.…”

Section: Discussionmentioning

confidence: 89%

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Azolla incorporation under flooding reduces grain cadmium accumulation by decreasing soil redox potential

Liu

Guo

et al. 2021

Sci Rep

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Cadmium (Cd) presents severe risks to human health and environments. The present study proposed a green option to reduce bioavailable Cd. Rice pot experiments were conducted under continuous flooding with three treatments (T1: intercropping azolla with rice; T2: incorporating azolla into soil before rice transplantation; CK: no azolla). The results showed that azolla incorporation reduced soluble Cd by 37% compared with the CK treatment, which may be explained by the decreased soil redox potential (Eh) (r = 0.867, P < 0.01). The higher relative abundance of Methylobacter observed in azolla incorporation treatment may account for dissolved organic carbon increase (r = 0.694; P < 0.05), and hence decreased the Cd availability for rice. Azolla incorporation increased the abundance of Nitrospira, indicating the potentially prominent role of nitrogen mineralization in increasing rice yields. Further, lower soluble Cd decreased the expression of OsNramp5, but increased OsHMA3 levels in rice roots, which decreased Cd accumulation in grains. Through these effects, azolla incorporation decreased Cd concentrations in rice grains by 80.3% and increased the production by 13.4%. The negligible amount of Cd absorbed by azolla would not increase the risk of long-term application. Thus, intercropping azolla with early rice and incorporating azolla into soil before late rice transplantation can contribute to safe production at large scales of double rice cultivation.

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Section: Discussionmentioning

confidence: 89%

“…Soil bacterial community are highly sensitive to soil Eh 14 , 15 . Soil microbes affect plant metal accessibility through their involvement in the decomposition, stabilization and maintenance of soil physical and chemical conditions, such as Proteobacteria and Acidobacteria 16 , 17 .…”

Section: Introductionmentioning

confidence: 99%

Azolla incorporation under flooding reduces grain cadmium accumulation by decreasing soil redox potential

Liu

Guo

et al. 2021

Sci Rep

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“…Yet, we have limited evidence on which or how the microbial network complexity and stability respond to natural regeneration and active revegetation of degraded ecosystems. Moreover, although revegetation can alter plant diversity, soil microbial community, diversity, structure, and activities (Cao et al, 2020; Harris, 2009; Kardol et al, 2009; Li et al, 2019; Wubs et al, 2016), it remains uncertain on the effects of active revegetation and natural regeneration on the network complexity and stability in microbial communities, which are tightly related to ecosystem functioning (Yuan et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Revegetation promotes soil microbial network stability in a novel riparian ecosystem

Gong

Chen

et al. 2023

Journal of Applied Ecology

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Soil microorganisms play a crucial role in ecosystem processes and functions, but how their co‐occurrence networks respond to restoration of degraded ecosystems remains poorly understood. Here, we examined the effects of revegetation on the structure and function of the soil microbiome, including soil microbial network complexity and stability, in a novel riparian ecosystem with winter submergence opposite to the natural hydrological regime. We found that extreme flooding intensity (30 m submergence up to 286 days per year) reduced microbial α‐diversity and network stability (robustness) but increased network complexity including network connectivity, connectance and average clustering coefficient over a 3‐year period, and those effects were mitigated by active revegetation in comparison with natural regeneration. Revegetation increased microbial network stability directly by decreasing network complexity, while extreme flooding regulated network stability indirectly by changing the soil total carbon content. Nevertheless, those dynamics of microbial network were coupling with soil microbial functions such as greenhouse gas (e.g. CH4, CO2 and N2O) fluxes and nutrient cycling. Synthesis and applications: This study provides evidence to support the critical role of revegetation in preserving soil microbial network stability and functions under changing hydrological regime.

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“…Rice rooting zone ecology differs fundamentally from that of most crops, with the alternately flooded and dry conditions of rice fields causing regular changes in the redox environment (Jiang et al, 2016). It is possible that understanding the whole biota of the rice rhizosphere, and how it varies under different conditions, could lead to more sustainable rice farming systems (Ding et al, 2019; Li et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

HigherpHis associated with enhanced co‐occurrence network complexity, stability and nutrient cycling functions in the rice rhizosphere microbiome

Guo

Song

et al. 2022

Environmental Microbiology

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The rice rhizosphere microbiota is crucial for crop yields and nutrient use efficiency. However, little is known about how co‐occurrence patterns, keystone taxa and functional gene assemblages relate to soil pH in the rice rhizosphere soils. Using shotgun metagenome analysis, the rice rhizosphere microbiome was investigated across 28 rice fields in east‐central China. At higher pH sites, the taxonomic co‐occurrence network of rhizosphere soils was more complex and compact, as defined by higher average degree, graph density and complexity. Network stability was greatest at medium pH (6.5 < pH < 7.5), followed by high pH (7.5 < pH). Keystone taxa were more abundant at higher pH and correlated significantly with key ecosystem functions. Overall functional genes involved in C, N, P and S cycling were at a higher relative abundance in higher pH rhizosphere soils, excepting C degradation genes (e.g. key genes involved in starch, cellulose, chitin and lignin degradation). Our results suggest that the rice rhizosphere soil microbial network is more complex and stable at higher pH, possibly indicating increased efficiency of nutrient cycling. These observations may indicate routes towards more efficient soil management and understanding of the potential effects of soil acidification on the rice rhizosphere system.

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Dynamics of the rice rhizosphere microbial community under continuous and intermittent flooding treatment

Cited by 20 publications

References 34 publications

Azolla incorporation under flooding reduces grain cadmium accumulation by decreasing soil redox potential

Azolla incorporation under flooding reduces grain cadmium accumulation by decreasing soil redox potential

Revegetation promotes soil microbial network stability in a novel riparian ecosystem

HigherpHis associated with enhanced co‐occurrence network complexity, stability and nutrient cycling functions in the rice rhizosphere microbiome

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