Root exudation of carbohydrates and cations from barley in response to drought and elevated CO2

Calvo, Olga C.; Franzaring, Jürgen; Schmid, I.; Fangmeier, Andreas

doi:10.1007/s11104-019-03998-y

Cited by 31 publications

(15 citation statements)

References 71 publications

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“…S2-4). Similarly, other recent studies showed increased exudation of carbohydrates (Canarini et al 2016;Preece et al 2018;Calvo et al 2019), amino acids (Canarini et al 2016;Bobille et al 2019), organic acids (Canarini et al 2016) and secondary metabolites (Gargallo-Garriga et al 2018) at low soil water contents. Canarini et al (2016) also showed species specific responses at different soil water contents.…”

Section: Soil Type and Soil Moisture Regulate Root Exudationsupporting

confidence: 66%

Interactive regulation of root exudation and rhizosphere denitrification by plant metabolite content and soil properties

et al. 2021

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Aims Root exudates are known to shape microbial activities in the rhizosphere and to be of fundamental importance for plant-soil-microbe-carbon–nitrogen interactions. However, it remains unclear how and to what extent the amount and composition of root exudation affects rhizosphere denitrification. Methods In this study root exudation patterns and rhizosphere denitrification enzyme activity of three different grass species grown on two agricultural soils under two different soil water contents were investigated under controlled conditions. Results We found that root exudation of primary metabolites largely depends on plant species, soil type, soil moisture and root exudation medium. In dependence of soil properties and soil moisture levels, plants largely controlled amount and quality of root exudation. Exudates affected denitrification activity and plant–microbe competition for nitrate. Specifically, exudation of organic acids stimulated denitrifying activity while the sugar lyxose exhibited an inhibitory effect. Conclusion We show that interactive effects of physicochemical soil properties and species-specific effects of plant metabolism on root exudation act as a dominant control of rhizosphere denitrification, thereby explaining more than half of its variance.

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Section: Soil Type and Soil Moisture Regulate Root Exudationsupporting

confidence: 66%

Interactive regulation of root exudation and rhizosphere denitrification by plant metabolite content and soil properties

et al. 2021

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“…The content of metabolites secreted by plant roots is closely related to ecological factors such as environment and climate conditions, and genetic factors also have a great impact on it ( Calvo et al, 2019 ). In order to overcome the influence of environmental factors, root exudates were collected in sterile test tubes with the same culture conditions.…”

Section: Discussionmentioning

confidence: 99%

Impact of PaGLK transgenic poplar on microbial community and soil enzyme activity in rhizosphere soil

Zheng

Chen

et al. 2022

Front. Bioeng. Biotechnol.

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Rhizosphere microorganisms are essential parts in maintaining soil ecological functions. Reforestation using genetically modified trees might have great potential to enhance tree production in biotic and abiotic stress, however, their long-term impact on rhizosphere microorganisms is scant. In this study, we studied soil enzyme activities and composition of rhizosphere microorganisms in 2-year-old transgenic PaGLK overexpression (OE), repressed expression (RE) and wild-type (WT) poplar (P. alba × P.berlinensis). The root exudates of PaGLK transgenic poplar (P.alba × P. berlinensis) were analyzed by liquid chromatography-mass spectrometry (LC-MS). The results showed that there were significant difference for soil sucrase, urease, catalase, neutral protease and cellulase between the transgenic and WT lines at different growth periods. Alpha diversity analysis showed that bacterial community abundance and diversity for RE lines were significantly lower than WT (p < 0.05), while RE lines for fungi were significantly higher than WT lines. At the genus level, Burkholderia was the dominant group of rhizosphere bacterial community, and the relative abundance for RE was significantly higher than WT. Tomentella was the dominant group for fungi community. Serendipita for RE was significantly higher than WT and OE. Main metabolite contents of (S)-ACPA, geniposidic acid, agnuside, hydroquinone and pyranocoumarins were significantly different among transgenic lines. These results suggest that transgenic activities have effects on root exudates, rhizosphere soil enzyme activities and soil microbial community composition, but long term effects need to be further investigated.

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“…Elevated CO 2 levels generally stimulate net primary production by increasing photosynthetic rates and water use efficiency, leading to higher shoot, root and total biomass and better-tasting fruits [5][6][7]. Root secretions are greatly increased under elevated CO 2 conditions and are characterized by a higher stimulated by increased primary production and might accelerate the cycling of other nutrients (N, P and S) under eCO 2 .…”

Section: Introductionmentioning

confidence: 99%

Effects of Elevated CO2 on Tomato (Lycopersicon esculentum Mill.) Growth and Rhizosphere Soil Microbial Community Structure and Functionality

2020

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Although elevated CO2 (eCO2) in the atmosphere is one of the main factors influencing climate and ecosystem stability, less research on eCO2 in greenhouse soil systems has been conducted, despite their prevalence. In this article, phospholipid fatty acid (PLFA) profiling, 16S rRNA and Internally Transcribed Spacer (ITS) gene sequencing and high-throughput quantity polymerase chain reactions (HT-qPCRs) for 72 biogeochemical cycling-related genes were used to reveal the comprehensive responses of microbes to 23 days eCO2 fumigation in the soil of a tomato greenhouse. Our results indicated that eCO2 significantly increased microbial biomass (p < 0.05). The fungal community was more susceptible to eCO2 than the bacterial community; the fungal alpha diversity indices decreased significantly under eCO2 (p < 0.05) and the abundance of Ascomycota and its lower level taxa also increased significantly (p < 0.01). The absolute abundance of numerous C, N, P, S and methane cycling related genes increased significantly (p < 0.05) under eCO2. Furthermore, the microbial community structure and function were correlated with certain measured plant characteristics. Hence, the microbial ecosystem of the tomato greenhouse soil system was stimulated under eCO2. These results contribute to a greater understanding of how eCO2 in the atmosphere affects terrestrial ecosystem stability.

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Root exudation of carbohydrates and cations from barley in response to drought and elevated CO2

Cited by 31 publications

References 71 publications

Interactive regulation of root exudation and rhizosphere denitrification by plant metabolite content and soil properties

Interactive regulation of root exudation and rhizosphere denitrification by plant metabolite content and soil properties

Impact of PaGLK transgenic poplar on microbial community and soil enzyme activity in rhizosphere soil

Effects of Elevated CO2 on Tomato (Lycopersicon esculentum Mill.) Growth and Rhizosphere Soil Microbial Community Structure and Functionality

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