Effects of vegetation cover and season on soil nitrifiers in an African savanna: Evidence of archaeal nitrifier inhibition by grasses

Srikanthasamy, Tharaniya; Koffi, Kouamé Fulgence; Tambosco, Kevin; Marcangeli, Yoan; Carmignac, David; N’Dri, Aya Brigitte; Gervaix, Jonathan; Leloup, Julie; Roux, Xavier Le; Lata, Jean‐Christophe

doi:10.1016/j.geoderma.2022.115775

Cited by 6 publications

(5 citation statements)

References 67 publications

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“…Contrary to this, the only variable that we found to be significantly correlated with the ammonia monooxygenase genes (amoCAB) was vegetation, mostly lichen and moss (negative correlation). An inverse relation between grass coverage and the dominant AOA ammonia oxidizers has been previously described for savanna soils (Srikanthasamy et al, 2022). Competition for ammonia and decrease in soil aeration in vegetation-covered areas may explain the lower frequency of nitrification genes in these regions, since nitrification is dependent on oxygen concentrations and ammonia availability (Wendeborn, 2020).…”

Section: Discussionmentioning

confidence: 81%

The spatial distribution and biogeochemical drivers of nitrogen cycle genes in an Antarctic desert

Pascoal

Areosa²,

Torgo³

et al. 2022

Front. Microbiol.

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Antarctic deserts, such as the McMurdo Dry Valleys (MDV), represent extremely cold and dry environments. Consequently, MDV are suitable for studying the environment limits on the cycling of key elements that are necessary for life, like nitrogen. The spatial distribution and biogeochemical drivers of nitrogen-cycling pathways remain elusive in the Antarctic deserts because most studies focus on specific nitrogen-cycling genes and/or organisms. In this study, we analyzed metagenome and relevant environmental data of 32 MDV soils to generate a complete picture of the nitrogen-cycling potential in MDV microbial communities and advance our knowledge of the complexity and distribution of nitrogen biogeochemistry in these harsh environments. We found evidence of nitrogen-cycling genes potentially capable of fully oxidizing and reducing molecular nitrogen, despite the inhospitable conditions of MDV. Strong positive correlations were identified between genes involved in nitrogen cycling. Clear relationships between nitrogen-cycling pathways and environmental parameters also indicate abiotic and biotic variables, like pH, water availability, and biological complexity that collectively impose limits on the distribution of nitrogen-cycling genes. Accordingly, the spatial distribution of nitrogen-cycling genes was more concentrated near the lakes and glaciers. Association rules revealed non-linear correlations between complex combinations of environmental variables and nitrogen-cycling genes. Association rules for the presence of denitrification genes presented a distinct combination of environmental variables from the remaining nitrogen-cycling genes. This study contributes to an integrative picture of the nitrogen-cycling potential in MDV.

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Section: Discussionmentioning

confidence: 81%

The spatial distribution and biogeochemical drivers of nitrogen cycle genes in an Antarctic desert

Pascoal

Areosa²,

Torgo³

et al. 2022

Front. Microbiol.

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“…Biological Nitrification Inhibition (BNI) has been proposed as a means to increase fertilizer efficiency in agriculture (Lata et al, 2022). Due to high inputs of N, the nitrification rate in agricultural systems is high (Elrys et al, 2021) and inhibition of nitrification can increase productivity.…”

Section: Perspectivesmentioning

confidence: 99%

“…Plants also positively or negatively control nitrification via root exudates affecting the metabolism of nitrifying bacteria and archaea (Lata et al, 2004(Lata et al, , 1999(Lata et al, , 2022Srikanthasamy et al, 2021Srikanthasamy et al, , 2022Srikanthasamy et al, , 2018Subbarao et al, 2009Subbarao et al, , 2007a. Crops such as sorghum, rice, maize, wheat and Bracharia exude molecules that block the enzymes involved in the first step of nitrification (Coskun et al, 2017;Subbarao et al, 2009;Zakir et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Nitrification Control by Plants and Preference for Ammonium versus Nitrate: Positive Feedbacks Increase Productivity but Undermine Resilience

Ardichvili,

Loeuille,

Lata

et al. 2024

The American Naturalist

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Some plants, via their action on microorganisms, control soil nitrification, i.e. the transformation of ammonium into nitrate. We model how the co-variation between plant control of nitrification and preference for ammonium vs. nitrate impacts ecosystem properties such as productivity, nitrogen (N) losses and overall resilience. We show that the control of nitrification can maximize productivity by minimizing total inorganic N losses. We initially predicted that plants with an ammonium preference should achieve the highest biomass when inhibiting nitrification; and conversely that plants preferring nitrate should achieve the highest biomass by stimulating nitrification. With a parametrization derived from the Lamto savanna (Ivory Coast), we find that productivity is maximal for plants that slightly prefer ammonium and inhibit nitrification.Such situations however lead to strong positive feedbacks that can cause abrupt shifts from a highly to a lowly productive ecosystem. The comparison with other parameter sets (Pawnee short-grass prairie (USA), intensively cultivated field, and a hypothetical parameter set in which ammonium is highly volatilized and nitrate inputs are high) shows that strategies yielding the highest biomass may be counter-intuitive (i.e. preferring nitrate but inhibiting nitrification). We argue that the level of control yielding the highest productivity depends on ecosystem properties (quantity of N deposition, leaching rates and baseline nitrification rates), not only preference.Finally, while contrasting N preferences offer, as expected, the possibility of coexistence through niche partitioning, we stress how control of nitrification can be framed as a niche construction process that adds an additional dimension to coexistence conditions.

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“…The amoA, nirS, and nirK are important genes in nitrification and denitrification. AOA amoA and AOB amoA are involved in the first, often limiting, step of nitrification (oxidation of ammonium into nitrite) [34]; nirK and nirS encode nitrite reductases [35]. Referring to the methods of Liao et al [36], we used specific primers for AOA amoA [37], AOB amoA [38], nirK, and nirS [39] to quantify the samples individually using the fluorescence PCR technique.…”

Section: Dna Extraction Pcr and Sequencing Of The Nitrogen Conversion...mentioning

confidence: 99%

Effect of the Sulfamethazine on Nitrogen Conversion in Alternate Wet and Dry Paddy Fields

et al. 2022

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Aquaculture wastewaters have been used in rice irrigation directly or indirectly. Antibiotics in aquaculture wastewater entering the rice fields with irrigation will affect the soil physicochemical properties, microbial properties, and nitrogen conversion. A pot experiment irrigated with simulated aquaculture wastewater was performed to study the effects of sulfamethazine in aquaculture wastewater on nitrogen concentration and conversion-related microorganisms in rice fields with different irrigation modes. Sulfamethazine (500 ng/L, 1500 ng/L, and 3000 ng/L) decreased the NH4+ concentration at the late tillering stage and NO3− concentration at the late tillering and jointing–booting stages (p < 0.05) but increased the NH4+ concentration at the late tillering stage (p < 0.05). Sulfamethazine (3000 ng/L) promoted the lowest nitrogen conversion gene (amoA, nirS, and nirK) abundances and the most special community structure of nitrogen conversion microorganism under mild alternate wetting and drying (AWD). Furthermore, Nitrosospira_sp._KAN8, belonging to ammonia-oxidizing bacteria (AOB), was sensitive to sulfamethazine. Flora with the same nitrogen conversion genes exhibited different variations under the same treatment. The results show that antibiotic and mild AWD caused more serious adverse effects to soil nitrogen conversion and nitrogen conversion microorganisms, which will increase the environmental risks of sulfamethazine. It can provide a basis for the scientific and rational use of aquaculture water to irrigate rice fields.

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Effects of vegetation cover and season on soil nitrifiers in an African savanna: Evidence of archaeal nitrifier inhibition by grasses

Cited by 6 publications

References 67 publications

The spatial distribution and biogeochemical drivers of nitrogen cycle genes in an Antarctic desert

The spatial distribution and biogeochemical drivers of nitrogen cycle genes in an Antarctic desert

Nitrification Control by Plants and Preference for Ammonium versus Nitrate: Positive Feedbacks Increase Productivity but Undermine Resilience

Effect of the Sulfamethazine on Nitrogen Conversion in Alternate Wet and Dry Paddy Fields

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