Temperature sensitivity of substrate-use efficiency can result from altered microbial physiology without change to community composition

Bölscher, Tobias; Paterson, Eric; Freitag, Thomas E.; Thornton, Barry; Herrmann, Anke M.

doi:10.1016/j.soilbio.2017.02.005

Cited by 52 publications

(26 citation statements)

References 56 publications

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“…The method allows quantification of energy turnover by soil organisms to show how bioenergetics define biogeochemical processes (Rong et al, 2007). Recently, calorimetry has been used to explore the functional importance of soil biota, including their composition, in various land use systems and across different temperature regimes (Sparling, 1983;Harris et al, 2012;Herrmann et al, 2014;Bölscher et al, 2016Bölscher et al, , 2017. Embedding calorimetry into a phenomics framework (i.e.…”

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confidence: 99%

Cortical Cell Diameter Is Key To Energy Costs of Root Growth in Wheat

et al. 2019

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Root growth requires substantial amounts of energy and thus carbohydrates. The energy costs of root growth are particularly high in both dry and compacted soil, due to high soil penetration resistance. Consequently, more carbon must be allocated from aboveground plant tissue to roots, which limits crop productivity. In this study, we tested the utility of root cortical cell diameter as a potential selection target to reduce the energy costs of root growth. Isothermal calorimetry was adopted for in situ quantification of the energy costs of root growth of 16 wheat (Triticum aestivum) genotypes under three levels of penetration resistance. We show that cortical cell diameter is a pivotal and heritable trait, which is strongly related to the energy costs of root growth. Genotypic diversity was found for cortical cell diameter and the energy costs of root growth. A large root cortical cell diameter correlated with reduced energy costs of root growth, particularly under high soil penetration resistance. Moreover, significant correlations were found between the ability to radially enlarge cortical cells upon greater penetration resistance (i.e. phenotypic plasticity) and the responsiveness in the energy costs of root growth. A higher degree of phenotypic plasticity in cortical cell diameter was associated with reduced energy costs of root growth as soil penetration resistance increased. We therefore suggest that genotypic diversity and phenotypic plasticity in cortical cell diameter should be harnessed to adapt crops to dry and compacted soils.

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Cortical Cell Diameter Is Key To Energy Costs of Root Growth in Wheat

et al. 2019

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“…We did observe a boost on BR rates during incubation, however such increase was expected since the temperature used in our experiment was higher than in situ temperatures. Yet changes in bacterial physiology may occur without changes in the bacterial community composition [66]. …”

Section: Discussionmentioning

confidence: 99%

Bacterioplankton Responses to Increased Organic Carbon and Nutrient Loading in a Boreal Estuary—Separate and Interactive Effects on Growth and Respiration

et al. 2017

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Increases in the terrestrial export of dissolved organic carbon (C) to rivers may be associated with additional loading of organic nitrogen (N) and phosphorus (P) to the coastal zone. However, little is known about how these resources interact in the regulation of heterotrophic bacterioplankton metabolism in boreal coastal ecosystems. Here, we measured changes in bacterioplankton production (BP) and respiration (BR) in response to full-factorial (C, N, and P) enrichment experiments at two sites within the Öre estuary, northern Sweden. The BR was stimulated by single C additions and further enhanced by combined additions of C and other nutrients. Single addition of N or P had no effect on BR rates. In contrast, BP was primarily limited by P at the site close to the river mouth and did not respond to C or N additions. However, at the site further away from the near the river mouth, BP was slightly stimulated by single additions of C. Possibly, the natural inflow of riverine bioavailable dissolved organic carbon induced local P limitation of BP near the river mouth, which was then exhausted and resulted in C-limited BP further away from the river mouth. We observed positive interactions between all elements on all responses except for BP at the site close to the river mouth, where P showed an independent effect. In light of predicted increases in terrestrial P and C deliveries, we expect future increases in BP and increases of BR of terrestrially delivered C substrates at the Öre estuary and similar areas.

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“…The mechanism(s) responsible for the change in temperature sensitivity of organic matter decomposition with higher nutrient inputs are, however, not known. Recent research suggests that microbial C use efficiency is temperature sensitive, i.e., it decreases with increasing temperature, and varies depending on organic matter inputs (Frey et al, 2013;Schindlbacher et al, 2015;Bö lscher et al, 2017). Efficiency is an important microbial physiological trait in determining the fate of C during organic matter decomposition in soil.…”

Section: Environmental Implications Of Different Temperature Responsementioning

confidence: 99%

“…Efficiency is an important microbial physiological trait in determining the fate of C during organic matter decomposition in soil. The N content of organic material may have a significant impact on the temperature sensitivity of microbial C use efficiency (Bö lscher et al, 2017). Nutrient inputs including N may affect how efficient microorganisms can utilize organic C with the result that C cycling in nutrient-rich ecosystems is more temperature sensitive compared with nutrientpoor soils.…”

Section: Environmental Implications Of Different Temperature Responsementioning

confidence: 99%

“…The temperature sensitivity of decomposition has been the subject of intensive investigation (e.g., Kä tterer et al, 1998;von Lü tzow and Kö gel-Knabner, 2009) and is a key component of Earth System Models used for climate projections (Todd-Brown et al, 2014). Substantial focus has been placed on the effects of organic matter quality (Fierer et al, 2005), microbial community composition and physiology (Vanhala et al, 2011;Wagai et al, 2013;Bö lscher et al, 2017), and soil moisture (Sierra et al, 2015). Less is known, however, about how C and N processes are affected at temperatures prevalent during wintertime, in particular the process dynamics close to 0°C.…”

Section: Introductionmentioning

confidence: 99%

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Temperature responses of nitrogen processes cannot be inferred from carbon turnover in a boreal Norway spruce forest

Herrmann

Coucheney

2019

J. Plant Nutr. Soil Sci.

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Cold season processes contribute substantially to annual carbon (C) and nitrogen (N) budgets in boreal forest ecosystems, but little is known about how decomposition processes are affected at temperatures prevalent during wintertime. The aim of this study was to evaluate temperature responses of soil C and N processes and to test the hypothesis that there is a switch towards decomposing N‐rich material when soil temperatures drop to near 0°C. In the laboratory, soils from a boreal forest long‐term nutrient fertilization experiment were exposed to different temperatures varying from +2 to +15°C, and C mineralization, gross as well as net N mineralization/immobilization were estimated. Carbon mineralization declined exponentially as temperature decreased, whereas the response of N processes to temperature varied, with some indication that soil C and N processes are decoupled at low temperatures. We could only partially confirm that the decoupling between C and N processes at low temperature was due to a switch to N‐rich material, i.e., a change in the material undergoing decomposition. Overall, our results clearly showed that temperature responses of N processes cannot be inferred from C processes in boreal forest ecosystems, and that there is a need to improve our understanding of the relationship between the two across the range of temperatures experienced throughout the year. In particular, further research is required to establish and evaluate appropriate proxies for modelling the relationship of C and N processes at temperatures close to the freezing point.

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Temperature sensitivity of substrate-use efficiency can result from altered microbial physiology without change to community composition

Cited by 52 publications

References 56 publications

Cortical Cell Diameter Is Key To Energy Costs of Root Growth in Wheat

Cortical Cell Diameter Is Key To Energy Costs of Root Growth in Wheat

Bacterioplankton Responses to Increased Organic Carbon and Nutrient Loading in a Boreal Estuary—Separate and Interactive Effects on Growth and Respiration

Temperature responses of nitrogen processes cannot be inferred from carbon turnover in a boreal Norway spruce forest

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