Defoliation alters the relative contributions of recent and non-recent assimilate to root exudation from Festuca rubra
The deposition of organic compounds from plant roots is a key determinant of rhizosphere microbial activity and community structure. Consequently, C-flow from roots to soil is an important process in coupling plant and microbial productivity, via impacts on microbial nutrient cycling in soil. Experi...
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| Autor*in: |
PATERSON, ERIC [verfasserIn] THORNTON, BARRY [verfasserIn] MIDWOOD, ANDREW J. [verfasserIn] |
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| Format: |
E-Artikel |
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| Erschienen: |
Oxford, UK: Blackwell Science Ltd ; 2005 |
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| Schlagwörter: |
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| Umfang: |
Online-Ressource |
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| Reproduktion: |
2005 ; Blackwell Publishing Journal Backfiles 1879-2005 |
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| Übergeordnetes Werk: |
In: Plant, cell & environment - Oxford [u.a.] : Wiley-Blackwell, 1978, 28(2005), 12, Seite 0 |
| Übergeordnetes Werk: |
volume:28 ; year:2005 ; number:12 ; pages:0 |
| Links: |
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| DOI / URN: |
10.1111/j.1365-3040.2005.01389.x |
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| 520 | |a The deposition of organic compounds from plant roots is a key determinant of rhizosphere microbial activity and community structure. Consequently, C-flow from roots to soil is an important process in coupling plant and microbial productivity, via impacts on microbial nutrient cycling in soil. Experimentally, isotopic tracers (13C or 14C) are used to track C inputs to soil and microbial communities. However, in many such studies the relationship between labelled C-flows and total C-flows are not established, limiting the interpretative value of the results. In this study, we applied steady-state near natural abundance 13CO2 labelling to determine the impact of partial defoliation of Festuca rubra on root exudation. This approach in axenic culture facilitated determination of the contribution of pre- and post-defoliation assimilates both to root C-flow and plant tissues. The results demonstrated that total root exudation was increased in the two days following defoliation. This was concurrent with reduced net CO2 assimilation and reduced allocation of post-defoliation assimilates below-ground and to active root meristems. Through determination of the δ13C of root exudates, it was established that the source of the increased root exudation was pre-defoliation assimilate. However, this response was transient, with reduced deposition of pre- and post-defoliation assimilates from roots during the period 2–4 d following defoliation. The results highlight the limitations of pulse-labelling approaches as a means of quantifying impacts of treatments on root exudation, particularly where the treatment is likely to affect plant C-partitioning or the balance between deposition to, and re-mobilization from, C-storage pools. | ||
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10.1111/j.1365-3040.2005.01389.x doi (DE-627)NLEJ243837771 DE-627 ger DE-627 rakwb PATERSON, ERIC verfasserin aut Defoliation alters the relative contributions of recent and non-recent assimilate to root exudation from Festuca rubra Oxford, UK Blackwell Science Ltd 2005 Online-Ressource nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The deposition of organic compounds from plant roots is a key determinant of rhizosphere microbial activity and community structure. Consequently, C-flow from roots to soil is an important process in coupling plant and microbial productivity, via impacts on microbial nutrient cycling in soil. Experimentally, isotopic tracers (13C or 14C) are used to track C inputs to soil and microbial communities. However, in many such studies the relationship between labelled C-flows and total C-flows are not established, limiting the interpretative value of the results. In this study, we applied steady-state near natural abundance 13CO2 labelling to determine the impact of partial defoliation of Festuca rubra on root exudation. This approach in axenic culture facilitated determination of the contribution of pre- and post-defoliation assimilates both to root C-flow and plant tissues. The results demonstrated that total root exudation was increased in the two days following defoliation. This was concurrent with reduced net CO2 assimilation and reduced allocation of post-defoliation assimilates below-ground and to active root meristems. Through determination of the δ13C of root exudates, it was established that the source of the increased root exudation was pre-defoliation assimilate. However, this response was transient, with reduced deposition of pre- and post-defoliation assimilates from roots during the period 2–4 d following defoliation. The results highlight the limitations of pulse-labelling approaches as a means of quantifying impacts of treatments on root exudation, particularly where the treatment is likely to affect plant C-partitioning or the balance between deposition to, and re-mobilization from, C-storage pools. 2005 Blackwell Publishing Journal Backfiles 1879-2005 |2005|||||||||| root exudation THORNTON, BARRY verfasserin aut MIDWOOD, ANDREW J. verfasserin aut SIM, ALLAN oth In Plant, cell & environment Oxford [u.a.] : Wiley-Blackwell, 1978 28(2005), 12, Seite 0 Online-Ressource (DE-627)NLEJ243926944 (DE-600)2020843-1 1365-3040 nnns volume:28 year:2005 number:12 pages:0 http://dx.doi.org/10.1111/j.1365-3040.2005.01389.x text/html Verlag Deutschlandweit zugänglich Volltext GBV_USEFLAG_U ZDB-1-DJB GBV_NL_ARTICLE AR 28 2005 12 0 |
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10.1111/j.1365-3040.2005.01389.x doi (DE-627)NLEJ243837771 DE-627 ger DE-627 rakwb PATERSON, ERIC verfasserin aut Defoliation alters the relative contributions of recent and non-recent assimilate to root exudation from Festuca rubra Oxford, UK Blackwell Science Ltd 2005 Online-Ressource nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The deposition of organic compounds from plant roots is a key determinant of rhizosphere microbial activity and community structure. Consequently, C-flow from roots to soil is an important process in coupling plant and microbial productivity, via impacts on microbial nutrient cycling in soil. Experimentally, isotopic tracers (13C or 14C) are used to track C inputs to soil and microbial communities. However, in many such studies the relationship between labelled C-flows and total C-flows are not established, limiting the interpretative value of the results. In this study, we applied steady-state near natural abundance 13CO2 labelling to determine the impact of partial defoliation of Festuca rubra on root exudation. This approach in axenic culture facilitated determination of the contribution of pre- and post-defoliation assimilates both to root C-flow and plant tissues. The results demonstrated that total root exudation was increased in the two days following defoliation. This was concurrent with reduced net CO2 assimilation and reduced allocation of post-defoliation assimilates below-ground and to active root meristems. Through determination of the δ13C of root exudates, it was established that the source of the increased root exudation was pre-defoliation assimilate. However, this response was transient, with reduced deposition of pre- and post-defoliation assimilates from roots during the period 2–4 d following defoliation. The results highlight the limitations of pulse-labelling approaches as a means of quantifying impacts of treatments on root exudation, particularly where the treatment is likely to affect plant C-partitioning or the balance between deposition to, and re-mobilization from, C-storage pools. 2005 Blackwell Publishing Journal Backfiles 1879-2005 |2005|||||||||| root exudation THORNTON, BARRY verfasserin aut MIDWOOD, ANDREW J. verfasserin aut SIM, ALLAN oth In Plant, cell & environment Oxford [u.a.] : Wiley-Blackwell, 1978 28(2005), 12, Seite 0 Online-Ressource (DE-627)NLEJ243926944 (DE-600)2020843-1 1365-3040 nnns volume:28 year:2005 number:12 pages:0 http://dx.doi.org/10.1111/j.1365-3040.2005.01389.x text/html Verlag Deutschlandweit zugänglich Volltext GBV_USEFLAG_U ZDB-1-DJB GBV_NL_ARTICLE AR 28 2005 12 0 |
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10.1111/j.1365-3040.2005.01389.x doi (DE-627)NLEJ243837771 DE-627 ger DE-627 rakwb PATERSON, ERIC verfasserin aut Defoliation alters the relative contributions of recent and non-recent assimilate to root exudation from Festuca rubra Oxford, UK Blackwell Science Ltd 2005 Online-Ressource nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The deposition of organic compounds from plant roots is a key determinant of rhizosphere microbial activity and community structure. Consequently, C-flow from roots to soil is an important process in coupling plant and microbial productivity, via impacts on microbial nutrient cycling in soil. Experimentally, isotopic tracers (13C or 14C) are used to track C inputs to soil and microbial communities. However, in many such studies the relationship between labelled C-flows and total C-flows are not established, limiting the interpretative value of the results. In this study, we applied steady-state near natural abundance 13CO2 labelling to determine the impact of partial defoliation of Festuca rubra on root exudation. This approach in axenic culture facilitated determination of the contribution of pre- and post-defoliation assimilates both to root C-flow and plant tissues. The results demonstrated that total root exudation was increased in the two days following defoliation. This was concurrent with reduced net CO2 assimilation and reduced allocation of post-defoliation assimilates below-ground and to active root meristems. Through determination of the δ13C of root exudates, it was established that the source of the increased root exudation was pre-defoliation assimilate. However, this response was transient, with reduced deposition of pre- and post-defoliation assimilates from roots during the period 2–4 d following defoliation. The results highlight the limitations of pulse-labelling approaches as a means of quantifying impacts of treatments on root exudation, particularly where the treatment is likely to affect plant C-partitioning or the balance between deposition to, and re-mobilization from, C-storage pools. 2005 Blackwell Publishing Journal Backfiles 1879-2005 |2005|||||||||| root exudation THORNTON, BARRY verfasserin aut MIDWOOD, ANDREW J. verfasserin aut SIM, ALLAN oth In Plant, cell & environment Oxford [u.a.] : Wiley-Blackwell, 1978 28(2005), 12, Seite 0 Online-Ressource (DE-627)NLEJ243926944 (DE-600)2020843-1 1365-3040 nnns volume:28 year:2005 number:12 pages:0 http://dx.doi.org/10.1111/j.1365-3040.2005.01389.x text/html Verlag Deutschlandweit zugänglich Volltext GBV_USEFLAG_U ZDB-1-DJB GBV_NL_ARTICLE AR 28 2005 12 0 |
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10.1111/j.1365-3040.2005.01389.x doi (DE-627)NLEJ243837771 DE-627 ger DE-627 rakwb PATERSON, ERIC verfasserin aut Defoliation alters the relative contributions of recent and non-recent assimilate to root exudation from Festuca rubra Oxford, UK Blackwell Science Ltd 2005 Online-Ressource nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The deposition of organic compounds from plant roots is a key determinant of rhizosphere microbial activity and community structure. Consequently, C-flow from roots to soil is an important process in coupling plant and microbial productivity, via impacts on microbial nutrient cycling in soil. Experimentally, isotopic tracers (13C or 14C) are used to track C inputs to soil and microbial communities. However, in many such studies the relationship between labelled C-flows and total C-flows are not established, limiting the interpretative value of the results. In this study, we applied steady-state near natural abundance 13CO2 labelling to determine the impact of partial defoliation of Festuca rubra on root exudation. This approach in axenic culture facilitated determination of the contribution of pre- and post-defoliation assimilates both to root C-flow and plant tissues. The results demonstrated that total root exudation was increased in the two days following defoliation. This was concurrent with reduced net CO2 assimilation and reduced allocation of post-defoliation assimilates below-ground and to active root meristems. Through determination of the δ13C of root exudates, it was established that the source of the increased root exudation was pre-defoliation assimilate. However, this response was transient, with reduced deposition of pre- and post-defoliation assimilates from roots during the period 2–4 d following defoliation. The results highlight the limitations of pulse-labelling approaches as a means of quantifying impacts of treatments on root exudation, particularly where the treatment is likely to affect plant C-partitioning or the balance between deposition to, and re-mobilization from, C-storage pools. 2005 Blackwell Publishing Journal Backfiles 1879-2005 |2005|||||||||| root exudation THORNTON, BARRY verfasserin aut MIDWOOD, ANDREW J. verfasserin aut SIM, ALLAN oth In Plant, cell & environment Oxford [u.a.] : Wiley-Blackwell, 1978 28(2005), 12, Seite 0 Online-Ressource (DE-627)NLEJ243926944 (DE-600)2020843-1 1365-3040 nnns volume:28 year:2005 number:12 pages:0 http://dx.doi.org/10.1111/j.1365-3040.2005.01389.x text/html Verlag Deutschlandweit zugänglich Volltext GBV_USEFLAG_U ZDB-1-DJB GBV_NL_ARTICLE AR 28 2005 12 0 |
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10.1111/j.1365-3040.2005.01389.x doi (DE-627)NLEJ243837771 DE-627 ger DE-627 rakwb PATERSON, ERIC verfasserin aut Defoliation alters the relative contributions of recent and non-recent assimilate to root exudation from Festuca rubra Oxford, UK Blackwell Science Ltd 2005 Online-Ressource nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The deposition of organic compounds from plant roots is a key determinant of rhizosphere microbial activity and community structure. Consequently, C-flow from roots to soil is an important process in coupling plant and microbial productivity, via impacts on microbial nutrient cycling in soil. Experimentally, isotopic tracers (13C or 14C) are used to track C inputs to soil and microbial communities. However, in many such studies the relationship between labelled C-flows and total C-flows are not established, limiting the interpretative value of the results. In this study, we applied steady-state near natural abundance 13CO2 labelling to determine the impact of partial defoliation of Festuca rubra on root exudation. This approach in axenic culture facilitated determination of the contribution of pre- and post-defoliation assimilates both to root C-flow and plant tissues. The results demonstrated that total root exudation was increased in the two days following defoliation. This was concurrent with reduced net CO2 assimilation and reduced allocation of post-defoliation assimilates below-ground and to active root meristems. Through determination of the δ13C of root exudates, it was established that the source of the increased root exudation was pre-defoliation assimilate. However, this response was transient, with reduced deposition of pre- and post-defoliation assimilates from roots during the period 2–4 d following defoliation. The results highlight the limitations of pulse-labelling approaches as a means of quantifying impacts of treatments on root exudation, particularly where the treatment is likely to affect plant C-partitioning or the balance between deposition to, and re-mobilization from, C-storage pools. 2005 Blackwell Publishing Journal Backfiles 1879-2005 |2005|||||||||| root exudation THORNTON, BARRY verfasserin aut MIDWOOD, ANDREW J. verfasserin aut SIM, ALLAN oth In Plant, cell & environment Oxford [u.a.] : Wiley-Blackwell, 1978 28(2005), 12, Seite 0 Online-Ressource (DE-627)NLEJ243926944 (DE-600)2020843-1 1365-3040 nnns volume:28 year:2005 number:12 pages:0 http://dx.doi.org/10.1111/j.1365-3040.2005.01389.x text/html Verlag Deutschlandweit zugänglich Volltext GBV_USEFLAG_U ZDB-1-DJB GBV_NL_ARTICLE AR 28 2005 12 0 |
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Defoliation alters the relative contributions of recent and non-recent assimilate to root exudation from Festuca rubra |
| abstract |
The deposition of organic compounds from plant roots is a key determinant of rhizosphere microbial activity and community structure. Consequently, C-flow from roots to soil is an important process in coupling plant and microbial productivity, via impacts on microbial nutrient cycling in soil. Experimentally, isotopic tracers (13C or 14C) are used to track C inputs to soil and microbial communities. However, in many such studies the relationship between labelled C-flows and total C-flows are not established, limiting the interpretative value of the results. In this study, we applied steady-state near natural abundance 13CO2 labelling to determine the impact of partial defoliation of Festuca rubra on root exudation. This approach in axenic culture facilitated determination of the contribution of pre- and post-defoliation assimilates both to root C-flow and plant tissues. The results demonstrated that total root exudation was increased in the two days following defoliation. This was concurrent with reduced net CO2 assimilation and reduced allocation of post-defoliation assimilates below-ground and to active root meristems. Through determination of the δ13C of root exudates, it was established that the source of the increased root exudation was pre-defoliation assimilate. However, this response was transient, with reduced deposition of pre- and post-defoliation assimilates from roots during the period 2–4 d following defoliation. The results highlight the limitations of pulse-labelling approaches as a means of quantifying impacts of treatments on root exudation, particularly where the treatment is likely to affect plant C-partitioning or the balance between deposition to, and re-mobilization from, C-storage pools. |
| abstractGer |
The deposition of organic compounds from plant roots is a key determinant of rhizosphere microbial activity and community structure. Consequently, C-flow from roots to soil is an important process in coupling plant and microbial productivity, via impacts on microbial nutrient cycling in soil. Experimentally, isotopic tracers (13C or 14C) are used to track C inputs to soil and microbial communities. However, in many such studies the relationship between labelled C-flows and total C-flows are not established, limiting the interpretative value of the results. In this study, we applied steady-state near natural abundance 13CO2 labelling to determine the impact of partial defoliation of Festuca rubra on root exudation. This approach in axenic culture facilitated determination of the contribution of pre- and post-defoliation assimilates both to root C-flow and plant tissues. The results demonstrated that total root exudation was increased in the two days following defoliation. This was concurrent with reduced net CO2 assimilation and reduced allocation of post-defoliation assimilates below-ground and to active root meristems. Through determination of the δ13C of root exudates, it was established that the source of the increased root exudation was pre-defoliation assimilate. However, this response was transient, with reduced deposition of pre- and post-defoliation assimilates from roots during the period 2–4 d following defoliation. The results highlight the limitations of pulse-labelling approaches as a means of quantifying impacts of treatments on root exudation, particularly where the treatment is likely to affect plant C-partitioning or the balance between deposition to, and re-mobilization from, C-storage pools. |
| abstract_unstemmed |
The deposition of organic compounds from plant roots is a key determinant of rhizosphere microbial activity and community structure. Consequently, C-flow from roots to soil is an important process in coupling plant and microbial productivity, via impacts on microbial nutrient cycling in soil. Experimentally, isotopic tracers (13C or 14C) are used to track C inputs to soil and microbial communities. However, in many such studies the relationship between labelled C-flows and total C-flows are not established, limiting the interpretative value of the results. In this study, we applied steady-state near natural abundance 13CO2 labelling to determine the impact of partial defoliation of Festuca rubra on root exudation. This approach in axenic culture facilitated determination of the contribution of pre- and post-defoliation assimilates both to root C-flow and plant tissues. The results demonstrated that total root exudation was increased in the two days following defoliation. This was concurrent with reduced net CO2 assimilation and reduced allocation of post-defoliation assimilates below-ground and to active root meristems. Through determination of the δ13C of root exudates, it was established that the source of the increased root exudation was pre-defoliation assimilate. However, this response was transient, with reduced deposition of pre- and post-defoliation assimilates from roots during the period 2–4 d following defoliation. The results highlight the limitations of pulse-labelling approaches as a means of quantifying impacts of treatments on root exudation, particularly where the treatment is likely to affect plant C-partitioning or the balance between deposition to, and re-mobilization from, C-storage pools. |
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| title_short |
Defoliation alters the relative contributions of recent and non-recent assimilate to root exudation from Festuca rubra |
| url |
http://dx.doi.org/10.1111/j.1365-3040.2005.01389.x |
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| author2 |
THORNTON, BARRY MIDWOOD, ANDREW J. SIM, ALLAN |
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THORNTON, BARRY MIDWOOD, ANDREW J. SIM, ALLAN |
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| doi_str |
10.1111/j.1365-3040.2005.01389.x |
| up_date |
2024-07-06T06:41:01.527Z |
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