What is the role of exogenous NO for plants, microbes, and their interactions in soil?
Microbial Ecology and Applied Microbiology
Ecology of Land Use
Final Report Abstract
The NO-PIMS project was based on the central hypothesis that exogenous NO, either produced by plants or by soil microorganisms, significantly affects plant physiology and microbial metabolism, e.g., by altering the soil and rhizosphere microbiome, microbial C and N turnover processes in soils, or by altering the fluxes of environmentally relevant C and N-trace gases between soils and the atmosphere. To test this hypothesis, complex experiments with newly developed soil-mesocosm systems were performed with model plants (mainly Arabidopsis spec. mutants) and soils exposed to different atmospheric NO concentrations. While we found some evidence that NO production levels by plants affect the soil microbiome, only minor effects of elevated atmospheric NO concentrations on soil N and C fluxes or soil microbial C and N turnover (e.g., mineralization, gross nitrification) were found, mainly related to N2O production and emission. So far, these results are only valid for the investigated arable soil, which has a rather low NO production capacity compared to, e.g., acidic forest soils investigated in previous studies. We are still investigating the effects of NO on other plants, in particular tomato (unpublished results), as NO may function as an important signaling compound for microbe-plant interactions. However, this question will be addressed in follow-up research. Nevertheless, our project suggests that current atmospheric NO concentrations are unlikely to directly affect soil N processes.
Publications
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A synthesis of nitric oxide emissions across global fertilized croplands from crop‐specific emission factors. Global Change Biology, 28(14), 4395-4408.
Wang, Yan; Yao, Zhisheng; Zheng, Xunhua; Subramaniam, Logapragasan & Butterbach‐Bahl, Klaus
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An innovative soil mesocosm system for studying the effect of soil moisture and background NO on soil surface C and N trace gas fluxes. Biology and Fertility of Soils, 60(8), 1143-1157.
Subramaniam, Logapragasan; Engelsberger, Florian; Wolf, Benjamin; Brüggemann, Nicolas; Philippot, Laurent; Dannenmann, Michael & Butterbach-Bahl, Klaus
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Microbiota responses to mutations affecting NO homeostasis in Arabidopsis thaliana. New Phytologist, 244(5), 2008-2023.
Berger, Antoine; Pérez‐Valera, Eduardo; Blouin, Manuel; Breuil, Marie‐Christine; Butterbach‐Bahl, Klaus; Dannenmann, Michael; Besson‐Bard, Angélique; Jeandroz, Sylvain; Valls, Josep; Spor, Aymé; Subramaniam, Logapragasan; Pétriacq, Pierre; Wendehenne, David & Philippot, Laurent
