Thermal adaptation occurs in the respiration and growth of widely distributed bacteria

Tian, Weitao; Sun, Huimin; Zhang, Yan; Xu, Jianjun; Yao, Jia; Li, Jinquan; Li, Bo; Nie, Ming

doi:10.1111/gcb.16102

Cited by 23 publications

(13 citation statements)

References 98 publications

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“…Some previous OTC warming experiments in this region have indeed reported significant shifts in plant and soil microbial communities (Wang et al, 2012;Xiong et al, 2016). In our second moisture incubation experiment, we could also expect similar shifts in the microbial population and/or community, which have been observed by recent incubation studies that linked these shifts to microbial thermal compensation (Chen et al, 2020(Chen et al, , 2022Tian et al, 2022). Further studies explicitly investigating how microbial community membership influences the thermal compensation under different environmental constraints will yield detailed mechanistic insights into microbial-mediated carbon-climate feedback.…”

Section: Discussionsupporting

confidence: 84%

Low soil moisture suppresses the thermal compensatory response of microbial respiration

Zhang

Chen

et al. 2022

Global Change Biology

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The thermal compensatory response of microbial respiration contributes to a decrease in warming-induced enhancement of soil respiration over time, which could weaken the positive feedback between the carbon cycle and climate warming. Climate warming is also predicted to cause a worldwide decrease in soil moisture, which has an effect on the microbial metabolism of soil carbon. However, whether and how changes in moisture affect the thermal compensatory response of microbial respiration are unexplored. Here, using soils from an 8-year warming experiment in an alpine grassland, we assayed the thermal response of microbial respiration rates at different soil moisture levels. The results showed that relatively low soil moisture suppressed the thermal compensatory response of microbial respiration, leading to an enhanced response to warming. A subsequent moisture incubation experiment involving offplot soils also showed that the response of microbial respiration to 100 d warming shifted from a slight compensatory response to an enhanced response with decreasing incubation moisture. Further analysis revealed that such respiration regulation by moisture was associated with shifts in enzymatic activities and carbon use efficiency.Our findings suggest that future drought induced by climate warming might weaken the thermal compensatory capacity of microbial respiration, with important consequences for carbon-climate feedback.

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Section: Discussionsupporting

confidence: 84%

Low soil moisture suppresses the thermal compensatory response of microbial respiration

Zhang

Chen

et al. 2022

Global Change Biology

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“…Increased temperature can have both direct and indirect effects on microbial CUE. Generally, warming decreases microbial CUE, as a greater proportion of the substrate is reallocated from growth to maintenance metabolism 19 , 27 , which alters rates of enzyme-driven processes 28 – 30 . Warming can alter CUE indirectly via changes in soil moisture, substrate availability or the composition and/or structure of microbial communities 27 , 31 .…”

Section: Introductionmentioning

confidence: 99%

Microbially mediated mechanisms underlie soil carbon accrual by conservation agriculture under decade-long warming

Tian,

Dungait,

Hou

et al. 2024

Nat Commun

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Increasing soil organic carbon (SOC) in croplands by switching from conventional to conservation management may be hampered by stimulated microbial decomposition under warming. Here, we test the interactive effects of agricultural management and warming on SOC persistence and underlying microbial mechanisms in a decade-long controlled experiment on a wheat-maize cropping system. Warming increased SOC content and accelerated fungal community temporal turnover under conservation agriculture (no tillage, chopped crop residue), but not under conventional agriculture (annual tillage, crop residue removed). Microbial carbon use efficiency (CUE) and growth increased linearly over time, with stronger positive warming effects after 5 years under conservation agriculture. According to structural equation models, these increases arose from greater carbon inputs from the crops, which indirectly controlled microbial CUE via changes in fungal communities. As a result, fungal necromass increased from 28 to 53%, emerging as the strongest predictor of SOC content. Collectively, our results demonstrate how management and climatic factors can interact to alter microbial community composition, physiology and functions and, in turn, SOC formation and accrual in croplands.

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“…The first mechanism is microbial thermal adaptation, which refers to the direct compensatory responses of microorganisms to warming across immediate to multigenerational time scales [ 17 ]. This adaptation is manifested by the physiological adjustment of individuals [ 16 ], evolutionary selection for genotypes within populations [ 19 ], and/or species turnover [ 20 ]. For example, a decrease in the conformational flexibility of enzymes and a reduction in cell membrane permeability following warming may impose constraints on the physiological process rates of individual microorganisms [ 21 ].…”

Section: Introductionmentioning

confidence: 99%

Stronger compensatory thermal adaptation of soil microbial respiration with higher substrate availability

Qu,

Wang,

Manzoni

et al. 2024

The ISME Journal

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Ongoing global warming is expected to augment soil respiration by increasing microbial activity, driving self-reinforcing feedback to climate change. However, the compensatory thermal adaptation of soil microorganisms and substrate depletion may weaken the effects of rising temperature on soil respiration. To test this hypothesis, we collected soils along a large-scale forest transect in eastern China spanning a natural temperature gradient, and incubated the soils at different temperatures with or without substrate addition. We combined the exponential thermal response function and a data-driven model to study the interaction effect of thermal adaptation and substrate availability on microbial respiration and compared our results to those from two additional continental and global independent datasets. Modelled results suggested that the effect of thermal adaptation on microbial respiration was greater in areas with higher mean annual temperatures, consistent with the compensatory response to warming. In addition, the effect of thermal adaptation on microbial respiration was greater under substrate addition than under substrate depletion, which was also true for the independent datasets reanalyzed using our approach. Our results indicate that thermal adaptation in warmer regions could exert a more pronounced negative impact on microbial respiration when substrate availability is abundant. These findings improve the body of knowledge on how substrate availability influences soil microbial community-temperature interactions, which could improve estimates of projected soil carbon losses to the atmosphere through respiration.

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Thermal adaptation occurs in the respiration and growth of widely distributed bacteria

Cited by 23 publications

References 98 publications

Low soil moisture suppresses the thermal compensatory response of microbial respiration

Low soil moisture suppresses the thermal compensatory response of microbial respiration

Microbially mediated mechanisms underlie soil carbon accrual by conservation agriculture under decade-long warming

Stronger compensatory thermal adaptation of soil microbial respiration with higher substrate availability

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