Plant responses to atmospheric CO2 enrichment with emphasis on roots and the rhizosphere

Rogers, H. H.; Runion, G. Brett; Krupa, Sagar V.

doi:10.1016/0269-7491(94)90034-5

Cited by 669 publications

(463 citation statements)

References 238 publications

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“…Previous studies have shown that, under elevated CO 2 , especially C 3 plants (as used in our study) increase their total root exudation mainly through the expansion of their root systems (Rogers et al, 1994;Allard et al, 2005), yielding qualitative and quantitative changes in root exudation and other forms of rhizodeposition (Paterson et al, 1996;Hodge and Millard, 1998). Differences in plant exudation patterns between plants species is thought to exert differential selection in the rhizosphere, thereby shaping the size and structure of soil-borne communities (Bardgett et al, 1999;Smalla et al, 2001;Kowalchuk et al, 2002).…”

Section: Antibiotic-production Genesmentioning

confidence: 54%

Specific rhizosphere bacterial and fungal groups respond differently to elevated atmospheric CO2

2009

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Soil community responses to increased atmospheric CO 2 concentrations are expected to occur mostly through interactions with changing vegetation patterns and plant physiology. To gain insight into the effects of elevated atmospheric CO 2 on the composition and functioning of microbial communities in the rhizosphere, Carex arenaria (a non-mycorrhizal plant species) and Festuca rubra (a mycorrhizal plant species) were grown under defined atmospheric conditions with either ambient (350 p.p.m.) or elevated (700 p.p.m.) CO 2 concentrations. PCR-DGGE (PCR-denaturing gradient gel electrophoresis) and quantitative-PCR were carried out to analyze, respectively, the structure and abundance of the communities of actinomycetes, Fusarium spp., Trichoderma spp., Pseudomonas spp., Burkholderia spp. and Bacillus spp. Responses of specific functional groups, such as phloroglucinol, phenazine and pyrrolnitrin producers, were also examined by quantitative-PCR, and HPLC (high performance liquid chromatography) was employed to assess changes in exuded sugars in the rhizosphere. Multivariate analysis of group-specific community profiles showed disparate responses to elevated CO 2 for the different bacterial and fungal groups examined, and these responses were dependent on plant type and soil nutrient availability. Within the bacterial community, the genera Burkholderia and Pseudomonas, typically known as successful rhizosphere colonizers, were significantly influenced by elevated CO 2 , whereas the genus Bacillus and actinomycetes, typically more dominant in bulk soil, were not. Total sugar concentrations in the rhizosphere also increased in both plants in response to elevated CO 2 . The abundances of phloroglucinol-, phenazine-and pyrrolnitrin-producing bacterial communities were also influenced by elevated CO 2 , as was the abundance of the fungal genera Fusarium and Trichoderma.

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Section: Antibiotic-production Genesmentioning

confidence: 54%

Specific rhizosphere bacterial and fungal groups respond differently to elevated atmospheric CO2

2009

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“…This correlation indicates that acclimation due to a limited pot size did not occur in this study. Although sink activity apparently plays a role in acclimation, the effect of CO2 on photosynthetic capacity is still uncertain (Rogers & Runion, 1994). Bazzaz (1990) suggested that a reduced specific leaf area (SLA), possibly associated with starch accumulation, could be responsible for the regularly observed (disappearance of growth stimulation with time.…”

Section: Discussionmentioning

confidence: 99%

Carbon allocation and water use in juvenile Douglas fir under elevated CO₂

Gorissen¹,

Kuikman²,

Beek³

1995

New Phytologist

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SUMMARYIn this study the impact of an elevated CO, level on allocation of assimilates and water use efficiency of Douglas fir [Pseudotsiiga menziesii (Mirb.) Franco] was investigated. Juvenile Douglas firs were exposed to a long-term treatment at 350 and 700^1 T' CO^ for 14 months and subsequently crosswise transferred to phytotrons for a short-term treatment with 350 and 700 fi\ 1"^ COj for 4 wk in an atmosphere continuously labelled with "CO^. No interactive efTects on total net uptake of ^^COj between long-term treatment and short-term treatment were observed. The short-term treatment with 700 n\ 1"' COj increased the total net uptake of "CO^ by 22 %, compared with the 350 //I 1"^ CO^ treatment. The long-term pretreatment did not affect the total net uptake, suggesting that photosynthetic acclimation had not occurred. However, expressed per unit of needle mass a 14% reduction was observed in the trees pretreated at 700 /tl 1"^ COj. This was not because of a reduced sink strength of the root system. This reduced uptake per unit of needle mass after long-term treatment may have implications for carbon storage in forest ecosystems. The results showed that an initial growth stimulation can eventually be annulled by developing physiological or morphological adaptions. "CO^ in the root/soil respiration increased in the short-term treatment with 700 //I 1"^ CO^, indicating a stimulated use of current carbon compounds either by roots or microorganisms. The water use efficiency during the short-term treatment with 700 /tl T' COg increased by 32 %, but was not affected by the long-term pretreatment. Water use per unit needle mass during the short-term treatment was decreased both by the short-term treatment and by the long-term pretreatment by about 15%. Some of the observed effects appeared to be persistent, such as decreased water use per unit needle mass, whereas others, stimulation of total net "CO2 uptake and water use efficiency, were transient.

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“…Indeed, because of the competitive inhibition by O 2 of the ribulose-1,5-bisphosphate carboxylase, which is responsible for CO 2 fixation during photosynthesis [7], the C 3 plant photosynthetic rate increases under a CO 2 -enriched atmosphere [28,47,51]. An increased root biomass under CO 2 enrichment has been shown by several authors [25,30,47,52,53].…”

Section: Introductionmentioning

confidence: 94%

“…1) showed under CO 2 enrichment a consistent increase in the most probable numbers of heterotrophs inhabiting rhizospheric soil surrounding L. perenne roots. This result is explained by an increased amount of CO 2 -induced rhizodeposition [47,52,66]. Qualitative changes in the composition of rhizodeposition may also be an explanation, but this feature is not well documented.…”

Section: Impact Of Elevated Co 2 On Heterotrophic Bacteria In the Rhimentioning

confidence: 99%

Influence of an Elevated Atmospheric CO 2 Content on Soil and Rhizosphere Bacterial Communities Beneath Lolium perenne and Trifolium repens under Field Conditions

1999

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The increase in atmospheric CO 2 content alters C 3 plant photosynthetic rate, leading to changes in rhizodeposition and other root activities. This may influence the activity, the biomass, and the structure of soil and rhizosphere microbial communities and therefore the nutrient cycling rates and the plant growth. The present paper focuses on bacterial numbers and on community structure. The rhizospheres of two grassland plants, Lolium perenne (ryegrass) and Trifolium repens (white clover), were divided into three fractions: the bulk soil, the rhizospheric soil, and the rhizoplaneendorhizosphere. The elevated atmospheric CO 2 content increased the most probable numbers of heterotrophic bacteria in the rhizosphere of L. perenne. However, this effect lasted only at the beginning of the vegetation period for T. repens. Community structure was assessed after isolation of DNA, PCR amplification, and construction of cloned 16S rDNA libraries. Amplified ribosomal DNA restriction analysis (ARDRA) and colony hybridization with an oligonucleotide probe designed to detect Pseudomonas spp. showed under elevated atmospheric CO 2 content an increased dominance of pseudomonads in the rhizosphere of L. perenne and a decreased dominance in the rhizosphere of T. repens. This work provides evidence for a CO 2 -induced alteration in the structure of the rhizosphere bacterial populations, suggesting a possible alteration of the plant-growthpromoting-rhizobacterial (PGPR) effect.

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Plant responses to atmospheric CO2 enrichment with emphasis on roots and the rhizosphere

Cited by 669 publications

References 238 publications

Specific rhizosphere bacterial and fungal groups respond differently to elevated atmospheric CO2

Specific rhizosphere bacterial and fungal groups respond differently to elevated atmospheric CO2

Carbon allocation and water use in juvenile Douglas fir under elevated CO₂

Influence of an Elevated Atmospheric CO 2 Content on Soil and Rhizosphere Bacterial Communities Beneath Lolium perenne and Trifolium repens under Field Conditions

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Plant responses to atmospheric CO2 enrichment with emphasis on roots and the rhizosphere

Cited by 669 publications

References 238 publications

Specific rhizosphere bacterial and fungal groups respond differently to elevated atmospheric CO2

Specific rhizosphere bacterial and fungal groups respond differently to elevated atmospheric CO2

Carbon allocation and water use in juvenile Douglas fir under elevated CO2

Influence of an Elevated Atmospheric CO 2 Content on Soil and Rhizosphere Bacterial Communities Beneath Lolium perenne and Trifolium repens under Field Conditions

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Carbon allocation and water use in juvenile Douglas fir under elevated CO₂