Influence of elevated CO2 and mycorrhizae on nitrogen acquisition: contrasting responses in Pinus taeda and Liquidambar styraciflua.
Identifieur interne : 003A83 ( Main/Corpus ); précédent : 003A82; suivant : 003A84Influence of elevated CO2 and mycorrhizae on nitrogen acquisition: contrasting responses in Pinus taeda and Liquidambar styraciflua.
Auteurs : J V Constable ; H. Bassirirad ; J. Lussenhop ; A. ZerihunSource :
- Tree physiology [ 0829-318X ] ; 2001.
English descriptors
- KwdEn :
- Basidiomycota (physiology), Carbon Dioxide (metabolism), Carbon Dioxide (physiology), Fungi (physiology), Magnoliaceae (growth & development), Magnoliaceae (metabolism), Magnoliaceae (physiology), Nitrate Reductase (MeSH), Nitrate Reductases (metabolism), Nitrogen (metabolism), Nitrogen (physiology), Pinus (growth & development), Pinus (physiology), Pinus taeda (MeSH), Plant Roots (physiology).
- MESH :
- chemical , metabolism : Carbon Dioxide, Nitrate Reductases, Nitrogen.
- growth & development : Magnoliaceae, Pinus.
- metabolism : Magnoliaceae.
- physiology : Basidiomycota, Carbon Dioxide, Fungi, Magnoliaceae, Nitrogen, Pinus, Plant Roots.
- chemical : Nitrate Reductase, Pinus taeda.
Abstract
An understanding of root system capacity to acquire nitrogen (N) is critical in assessing the long-term growth impact of rising atmospheric CO2 concentration ([CO2]) on trees and forest ecosystems. We examined the effects of mycorrhizal inoculation and elevated [CO2] on root ammonium (NH4+) and nitrate (NO3-) uptake capacity in sweetgum (Liquidambar styraciflua L.) and loblolly pine (Pinus taeda L.). Mycorrhizal treatments included inoculation of seedlings with the arbuscular mycorrhizal (AM) fungus Glomus intraradices Schenck & Smith in sweetgum and the ectomycorrhizal (EM) fungus Laccaria bicolor (Maire) Orton in loblolly pine. These plants were then equally divided between ambient and elevated [CO2] treatments. After 6 months of treatment, root systems of both species exhibited a greater uptake capacity for NH4+ than for NO3-. In both species, mycorrhizal inoculation significantly increased uptake capacity for NO3-, but not for NH4+. In sweetgum, the mycorrhizal effect on NO3- and NH4+ uptake capacity depended on growth [C02]. Similarly, in loblolly pine, the mycorrhizal effect on NO3- uptake capacity depended on growth [CO2], but the effect on NH4+ uptake capacity did not. Mycorrhizal inoculation significantly enhanced root nitrate reductase activity (NRA) in both species, but elevated [CO2] increased root NRA only in sweetgum. Leaf NRA in sweetgum did not change significantly with mycorrhizal inoculation, but increased in response to [CO2]. Leaf NRA in loblolly pine was unaffected by either treatment. The results indicate that the mycorrhizal effect on specific root N uptake in these species depends on both the form of inorganic N and the mycorrhizal type. However, our data show that in addressing N status of plants under high [CO2], reliable prediction is possible only when information about other root system adjustments (e.g., biomass allocation to fine roots) is simultaneously considered.
DOI: 10.1093/treephys/21.2-3.83
PubMed: 11303652
Links to Exploration step
pubmed:11303652Le document en format XML
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<author><name sortKey="Constable, J V" sort="Constable, J V" uniqKey="Constable J" first="J V" last="Constable">J V Constable</name>
<affiliation><nlm:affiliation>Department of Biological Sciences, University of Illinois at Chicago, 60607, USA.</nlm:affiliation>
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<author><name sortKey="Bassirirad, H" sort="Bassirirad, H" uniqKey="Bassirirad H" first="H" last="Bassirirad">H. Bassirirad</name>
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<author><name sortKey="Lussenhop, J" sort="Lussenhop, J" uniqKey="Lussenhop J" first="J" last="Lussenhop">J. Lussenhop</name>
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<author><name sortKey="Zerihun, A" sort="Zerihun, A" uniqKey="Zerihun A" first="A" last="Zerihun">A. Zerihun</name>
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<sourceDesc><biblStruct><analytic><title xml:lang="en">Influence of elevated CO2 and mycorrhizae on nitrogen acquisition: contrasting responses in Pinus taeda and Liquidambar styraciflua.</title>
<author><name sortKey="Constable, J V" sort="Constable, J V" uniqKey="Constable J" first="J V" last="Constable">J V Constable</name>
<affiliation><nlm:affiliation>Department of Biological Sciences, University of Illinois at Chicago, 60607, USA.</nlm:affiliation>
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<author><name sortKey="Bassirirad, H" sort="Bassirirad, H" uniqKey="Bassirirad H" first="H" last="Bassirirad">H. Bassirirad</name>
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<author><name sortKey="Lussenhop, J" sort="Lussenhop, J" uniqKey="Lussenhop J" first="J" last="Lussenhop">J. Lussenhop</name>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Basidiomycota (physiology)</term>
<term>Carbon Dioxide (metabolism)</term>
<term>Carbon Dioxide (physiology)</term>
<term>Fungi (physiology)</term>
<term>Magnoliaceae (growth & development)</term>
<term>Magnoliaceae (metabolism)</term>
<term>Magnoliaceae (physiology)</term>
<term>Nitrate Reductase (MeSH)</term>
<term>Nitrate Reductases (metabolism)</term>
<term>Nitrogen (metabolism)</term>
<term>Nitrogen (physiology)</term>
<term>Pinus (growth & development)</term>
<term>Pinus (physiology)</term>
<term>Pinus taeda (MeSH)</term>
<term>Plant Roots (physiology)</term>
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<keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en"><term>Carbon Dioxide</term>
<term>Nitrate Reductases</term>
<term>Nitrogen</term>
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<keywords scheme="MESH" qualifier="growth & development" xml:lang="en"><term>Magnoliaceae</term>
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<keywords scheme="MESH" qualifier="metabolism" xml:lang="en"><term>Magnoliaceae</term>
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<term>Carbon Dioxide</term>
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<term>Magnoliaceae</term>
<term>Nitrogen</term>
<term>Pinus</term>
<term>Plant Roots</term>
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<keywords scheme="MESH" type="chemical" xml:lang="en"><term>Nitrate Reductase</term>
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<front><div type="abstract" xml:lang="en">An understanding of root system capacity to acquire nitrogen (N) is critical in assessing the long-term growth impact of rising atmospheric CO2 concentration ([CO2]) on trees and forest ecosystems. We examined the effects of mycorrhizal inoculation and elevated [CO2] on root ammonium (NH4+) and nitrate (NO3-) uptake capacity in sweetgum (Liquidambar styraciflua L.) and loblolly pine (Pinus taeda L.). Mycorrhizal treatments included inoculation of seedlings with the arbuscular mycorrhizal (AM) fungus Glomus intraradices Schenck & Smith in sweetgum and the ectomycorrhizal (EM) fungus Laccaria bicolor (Maire) Orton in loblolly pine. These plants were then equally divided between ambient and elevated [CO2] treatments. After 6 months of treatment, root systems of both species exhibited a greater uptake capacity for NH4+ than for NO3-. In both species, mycorrhizal inoculation significantly increased uptake capacity for NO3-, but not for NH4+. In sweetgum, the mycorrhizal effect on NO3- and NH4+ uptake capacity depended on growth [C02]. Similarly, in loblolly pine, the mycorrhizal effect on NO3- uptake capacity depended on growth [CO2], but the effect on NH4+ uptake capacity did not. Mycorrhizal inoculation significantly enhanced root nitrate reductase activity (NRA) in both species, but elevated [CO2] increased root NRA only in sweetgum. Leaf NRA in sweetgum did not change significantly with mycorrhizal inoculation, but increased in response to [CO2]. Leaf NRA in loblolly pine was unaffected by either treatment. The results indicate that the mycorrhizal effect on specific root N uptake in these species depends on both the form of inorganic N and the mycorrhizal type. However, our data show that in addressing N status of plants under high [CO2], reliable prediction is possible only when information about other root system adjustments (e.g., biomass allocation to fine roots) is simultaneously considered.</div>
</front>
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<Abstract><AbstractText>An understanding of root system capacity to acquire nitrogen (N) is critical in assessing the long-term growth impact of rising atmospheric CO2 concentration ([CO2]) on trees and forest ecosystems. We examined the effects of mycorrhizal inoculation and elevated [CO2] on root ammonium (NH4+) and nitrate (NO3-) uptake capacity in sweetgum (Liquidambar styraciflua L.) and loblolly pine (Pinus taeda L.). Mycorrhizal treatments included inoculation of seedlings with the arbuscular mycorrhizal (AM) fungus Glomus intraradices Schenck & Smith in sweetgum and the ectomycorrhizal (EM) fungus Laccaria bicolor (Maire) Orton in loblolly pine. These plants were then equally divided between ambient and elevated [CO2] treatments. After 6 months of treatment, root systems of both species exhibited a greater uptake capacity for NH4+ than for NO3-. In both species, mycorrhizal inoculation significantly increased uptake capacity for NO3-, but not for NH4+. In sweetgum, the mycorrhizal effect on NO3- and NH4+ uptake capacity depended on growth [C02]. Similarly, in loblolly pine, the mycorrhizal effect on NO3- uptake capacity depended on growth [CO2], but the effect on NH4+ uptake capacity did not. Mycorrhizal inoculation significantly enhanced root nitrate reductase activity (NRA) in both species, but elevated [CO2] increased root NRA only in sweetgum. Leaf NRA in sweetgum did not change significantly with mycorrhizal inoculation, but increased in response to [CO2]. Leaf NRA in loblolly pine was unaffected by either treatment. The results indicate that the mycorrhizal effect on specific root N uptake in these species depends on both the form of inorganic N and the mycorrhizal type. However, our data show that in addressing N status of plants under high [CO2], reliable prediction is possible only when information about other root system adjustments (e.g., biomass allocation to fine roots) is simultaneously considered.</AbstractText>
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