Role of plant root exudates in soil carbon and nitrogen transformation

Mergel, Alexander; Тімченко, А. В.; Kudeyarov, V. N.

doi:10.1007/978-94-011-5270-9_3

Cited by 13 publications

(7 citation statements)

References 9 publications

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“…Signaling through root volatile compounds or root exudates has been found in a number of species including legumes and grasses (Pierik et al, 2013) and may be acting here. Plant root exudates select for a specific microbial community (Shi et al, 2016) and have been found to affect the rate of microbial soil organic matter turnover (Mergel et al, 1998). Therefore, plants may influence the timing of soil microbial community activity in order to reduce direct competition for resources.…”

Section: Discussionmentioning

confidence: 99%

Cultivar Differences and Impact of Plant-Plant Competition on Temporal Patterns of Nitrogen and Biomass Accumulation

et al. 2019

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Current niche models cannot explain multi-species plant coexistence in complex ecosystems. One overlooked explanatory factor is within-growing season temporal dynamism of resource capture by plants. However, the timing and rate of resource capture are themselves likely to be mediated by plant-plant competition. This study used Barley ( Hordeum sp.) as a model species to examine the impacts of intra-specific competition, specifically inter- and intra-cultivar competition on the temporal dynamics of resource capture. Nitrogen and biomass accumulation of an early and late cultivar grown in isolation, inter- or intra- cultivar competition were investigated using sequential harvests. We did not find changes in the temporal dynamics of biomass accumulation in response to competition. However, peak nitrogen accumulation rate was significantly delayed for the late cultivar by 14.5 days and advanced in the early cultivar by 0.5 days when in intra-cultivar competition; there were no significant changes when in inter-cultivar competition. This may suggest a form of kin recognition as the target plants appeared to identify their neighbors and only responded temporally to intra-cultivar competition. The Relative Intensity Index found competition occurred in both the intra- and inter- cultivar mixtures, but a positive Land Equivalence Ratio value indicated complementarity in the inter-cultivar mixtures compared to intra-cultivar mixtures. The reason for this is unclear but may be due to the timing of the final harvest and may not be representative of the relationship between the competing plants. This study demonstrates neighbor-identity-specific changes in temporal dynamism in nutrient uptake. This contributes to our fundamental understanding of plant nutrient dynamics and plant-plant competition whilst having relevance to sustainable agriculture. Improved understanding of within-growing season temporal dynamism would also improve our understanding of coexistence in complex plant communities.

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Section: Discussionmentioning

confidence: 99%

Cultivar Differences and Impact of Plant-Plant Competition on Temporal Patterns of Nitrogen and Biomass Accumulation

et al. 2019

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“…Copiotrophic microbes could become dormant when carbon sources are depleted during plant senescence ( Kjelleberg et al, 1987 ), and break dormancy when sufficient nutrients are restored. Nitrogen fertilizer could stimulate the exudation of carbon-containing compounds from plant roots ( Mergel et al, 1998 ). It can be inferred that soil microbial communities might undergo higher nutrient availability under fertilized conditions than under non-fertilized conditions during plant growth.…”

Section: Discussionmentioning

confidence: 99%

Compositional Shift of Bacterial, Archaeal, and Fungal Communities Is Dependent on Trophic Lifestyles in Rice Paddy Soil

et al. 2021

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The soil environment determines plants’ health and performance during their life cycle. Therefore, ecological understanding on variations in soil environments, including physical, chemical, and biological properties, is crucial for managing agricultural fields. Here, we present a comprehensive and extensive blueprint of the bacterial, archaeal, and fungal communities in rice paddy soils with differing soil types and chemical properties. We discovered that natural variations of soil nutrients are important factors shaping microbial diversity. The responses of microbial diversity to soil nutrients were related to the distribution of microbial trophic lifestyles (oligotrophy and copiotrophy) in each community. The compositional changes of bacterial and archaeal communities in response to soil nutrients were mainly governed by oligotrophs, whereas copiotrophs were mainly involved in fungal compositional changes. Compositional shift of microbial communities by fertilization is linked to switching of microbial trophic lifestyles. Random forest models demonstrated that depletion of prokaryotic oligotrophs and enrichment of fungal copiotrophs are the dominant responses to fertilization in low-nutrient conditions, whereas enrichment of putative copiotrophs was important in high-nutrient conditions. Network inference also revealed that trophic lifestyle switching appertains to decreases in intra- and inter-kingdom microbial associations, diminished network connectivity, and switching of hub nodes from oligotrophs to copiotrophs. Our work provides ecological insight into how soil nutrient-driven variations in microbial communities affect soil health in modern agricultural systems.

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“…Plants select for a specific microbial community through root exudates (Hu et al 2018;Shi et al 2011). Therefore, root exudates may do more than simply increase the rate of nitrogen mineralisation (Mergel et al 1998), and may also influence the timing of mineralisation by influencing soil microbial community composition.…”

Section: -What Role Could Root Exudates Have In the Temporal Dynamicsmentioning

confidence: 99%

Plant-plant competition influences temporal dynamism of soil microbial enzyme activity

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Brooker

Rowntree

et al. 2019

Soil Biology and Biochemistry

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Soil enzyme activity was strongly associated with plant roots 2. Root axis activity was not temporally dynamic when in plant-plant competition 3. Root associated area was temporally dynamic in response to plant competition 4. Peak cellulase activity was delayed when in competition compared to isolation 5. Leucine aminopeptidase activity was delayed only in intra-cultivar competition *Highlights (for review)

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Role of plant root exudates in soil carbon and nitrogen transformation

Cited by 13 publications

References 9 publications

Cultivar Differences and Impact of Plant-Plant Competition on Temporal Patterns of Nitrogen and Biomass Accumulation

Cultivar Differences and Impact of Plant-Plant Competition on Temporal Patterns of Nitrogen and Biomass Accumulation

Compositional Shift of Bacterial, Archaeal, and Fungal Communities Is Dependent on Trophic Lifestyles in Rice Paddy Soil

Plant-plant competition influences temporal dynamism of soil microbial enzyme activity

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