The Influence of Elevated [CO2] on Diversity, Activity and Biogeochemical Functions of Rhizosphere and Soil Bacterial Communities

Tarnawski, Sonia Estelle; Aragno, Michel

doi:10.1007/3-540-31237-4_22

Cited by 24 publications

(10 citation statements)

References 49 publications

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“…Since plant biomass production, N 2 fixation, and microbial decomposition generally increase under elevated CO 2 (Tarnawski and Aragno, 2006), it was expected that soil mineral N content would also increase. However, no significant differences in soil

{NH}_{4}^{+}

and

{NO}_{3}^{-}

in the elevated CO 2 treatments were found relative to the control plots (Table 1).…”

Section: Discussionmentioning

confidence: 99%

Soil nitrogen transformations under elevated atmospheric CO2 and O3 during the soybean growing season

Pereira

Chung²,

Scow

et al. 2011

Environmental Pollution

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We investigated the influence of elevated CO2 and O3 on soil N cycling within the soybean growing season and across soil environments (i.e., rhizosphere and bulk soil) at the Soybean Free Air Concentration Enrichment (SoyFACE) experiment in Illinois, USA. Elevated O3 decreased soil mineral N likely through a reduction in plant material input and increased denitrification, which was evidenced by the greater abundance of the denitrifier gene nosZ. Elevated CO2 did not alter the parameters evaluated and both elevated CO2 and O3 showed no interactive effects on nitrifier and denitrifier abundance, nor on total and mineral N concentrations. These results indicate that elevated CO2 may have limited effects on N transformations in soybean agroecosystems. However, elevated O3 can lead to a decrease in soil N availability in both bulk and rhizosphere soils, and this likely also affects ecosystem productivity by reducing the mineralization rates of plant-derived residues.

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{NH}_{4}^{+}

and

{NO}_{3}^{-}

in the elevated CO 2 treatments were found relative to the control plots (Table 1).…”

Section: Discussionmentioning

confidence: 99%

Soil nitrogen transformations under elevated atmospheric CO2 and O3 during the soybean growing season

Pereira

Chung²,

Scow

et al. 2011

Environmental Pollution

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“…(Marilley et al 1999), of Rhizobium species (Schortemeyer et al 1996;Montealegre et al 2000), or stimulation of Proteobacteria (Jossi et al 2006). Griffiths et al (1998), Kandeler et al (1998), Tarnawski and Aragno (2006), and Zak et al (1996) did not observe significant differences in the structure of microbial communities associated with the growth of L. perenne under elevated CO 2 , as revealed by a global characterization of soil DNA (thermal denaturation and G + C content) and PLFA profiles. However, using similar approaches, Montealegre et al (2000) did detect changes in white clover rhizosphere communities in response to CO 2 enrichment.…”

Section: Effects Of Elevated Co 2 On the Dynamics Of Rhizosphere Micrmentioning

confidence: 92%

“…Except for a short period in spring, no such change occurred under T. repens. Tarnawski and Aragno (2006) hypothesized that at elevated atmospheric CO 2 conditions, fast-growing rstrategists, which are adapted to feed on easily utilizable substrates, are favored. This may result in a decreased soil N availability due to higher sequestration by the plant and the bacteria (Hu et al 2001).…”

Section: Effects Of Elevated Co 2 On the Dynamics Of Rhizosphere Micrmentioning

confidence: 99%

Climate change goes underground: effects of elevated atmospheric CO2 on microbial community structure and activities in the rhizosphere

2008

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General concern about climate change has led to growing interest in the responses of terrestrial ecosystems to elevated concentrations of CO 2 in the atmosphere. Experimentation during the last two to three decades using a large variety of approaches has provided sufficient information to conclude that enrichment of atmospheric CO 2 may have severe impact on terrestrial ecosystems. This impact is mainly due to the changes in the organic C dynamics as a result of the effects of elevated CO 2 on the primary source of organic C in soil, i.e., plant photosynthesis. As the majority of life in soil is heterotrophic and dependent on the input of plant-derived organic C, the activity and functioning of soil organisms will greatly be influenced by changes in the atmospheric CO 2 concentration. In this review, we examine the current state of the art with respect to effects of elevated atmospheric CO 2 on soil microbial communities, with a focus on microbial community structure. On the basis of the existing information, we conclude that the main effects of elevated atmospheric CO 2 on soil microbiota occur via plant metabolism and root secretion, especially in C3 plants, thereby directly affecting the mycorrhizal, bacterial, and fungal communities in the close vicinity of the root. There is little or no direct effect on the microbial community of the bulk soil. In particular, we have explored the impact of these changes on rhizosphere interactions and ecosystem processes, including food web interactions.

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“…was enhanced (Marilley et al , 1999). In other studies, the proportion of HCN‐producing Pseudomonas strains, considered as potential inhibitors of root parasitic fungi isolated from bulk and rhizosphere soil and from root fractions of two perennial grassland systems ( L. perenne and Medicago coerulea ), was reduced under elevated CO 2 conditions (Tarnawski & Aragno, 2006). However, the proportion of siderophore producers and nitrate‐dissimilating strains increased.…”

Section: Pgpb and Climate Change Conditionsmentioning

confidence: 98%

Climate change effects on beneficial plant-microorganism interactions

Compant¹,

Heijden²,

Sessitsch³

2010

FEMS Microbiology Ecology

368

321

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It is well known that beneficial plant-associated microorganisms may stimulate plant growth and enhance resistance to disease and abiotic stresses. The effects of climate change factors such as elevated CO(2), drought and warming on beneficial plant-microorganism interactions are increasingly being explored. This now makes it possible to test whether some general patterns occur and whether different groups of plant-associated microorganisms respond differently or in the same way to climate change. Here, we review the results of 135 studies investigating the effects of climate change factors on beneficial microorganisms and their interaction with host plants. The majority of studies showed that elevated CO(2) had a positive influence on the abundance of arbuscular and ectomycorrhizal fungi, whereas the effects on plant growth-promoting bacteria and endophytic fungi were more variable. In most cases, plant-associated microorganisms had a beneficial effect on plants under elevated CO(2). The effects of increased temperature on beneficial plant-associated microorganisms were more variable, positive and neutral, and negative effects were equally common and varied considerably with the study system and the temperature range investigated. Moreover, numerous studies indicated that plant growth-promoting microorganisms (both bacteria and fungi) positively affected plants subjected to drought stress. Overall, this review shows that plant-associated microorganisms are an important factor influencing the response of plants to climate change.

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The Influence of Elevated [CO2] on Diversity, Activity and Biogeochemical Functions of Rhizosphere and Soil Bacterial Communities

Cited by 24 publications

References 49 publications

Soil nitrogen transformations under elevated atmospheric CO2 and O3 during the soybean growing season

Soil nitrogen transformations under elevated atmospheric CO2 and O3 during the soybean growing season

Climate change goes underground: effects of elevated atmospheric CO2 on microbial community structure and activities in the rhizosphere

Climate change effects on beneficial plant-microorganism interactions

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