Carbon gain, allocation and storage in rhizomes in response to elevated atmospheric carbon dioxide and nutrient supply in a perennial C3 grass, Phalaris arundinacea
Reed canary grass (Phalaris arundinacea L.) is a fast-growing, perennial, rhizomatous C3 grass considered as a model invasive species for its aggressive behaviour. The same traits make it a candidate for bioenergy feedstock. We tested the following hypotheses: (1) elevated atmospheric [CO2] and nutrient supply enhance photosynthetic carbon acquisition of this fructan-accumulating grass with little or no photosynthetic downregulation; (2) elevated [CO2] promotes carbon allocation to growth when nutrients are sufficient and to fructan storage in rhizomes when nutrients are low. Plants were grown at ambient or elevated (+320μmolmol-1) [CO2], and fertilised using full or one-eighth strength modified Hoagland solution. We investigated leaf photosynthesis, whole-plant water use, biomass allocation, and nitrogen and carbon storage in rhizomes. Elevated [CO2] enhanced light-saturated net CO2 assimilation by 61%. It doubled whole-plant, stem and root biomass in summer. Plants grown in elevated [CO2] had a greater rate of CO2 assimilation at higher [CO2], indicating a shift in photosynthetic apparatus for enhanced carbon gain under elevated [CO2]. The majority of belowground biomass was allocated to rhizomes for storage rather than to roots in both seasons. In autumn, elevated [CO2] increased fructan concentration in rhizomes from 8.1 to 11.7% of biomass when nutrients were low (P=0.023). Our results suggest that elevated [CO2] combined with sufficient nutrients is likely to enhance carbon gain and growth of P. arundinacea, and to increase its productivity and competitiveness in summer. Elevated [CO2] is likely to enhance long-term fructan storage in rhizomes, which may benefit overwintering and vegetative spread.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2011 |
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| Erschienen: |
2011 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:38 |
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| Enthalten in: |
Functional plant biology : FPB - 38(2011), 10 vom: 20. Okt., Seite 797-807 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Kinmonth-Schultz, Hannah [VerfasserIn] |
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| Links: |
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| Anmerkungen: |
Date Revised 02.06.2020 published: Print Citation Status PubMed-not-MEDLINE |
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| doi: |
10.1071/FP11060 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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NLM310613434 |
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| 100 | 1 | |a Kinmonth-Schultz, Hannah |e verfasserin |4 aut | |
| 245 | 1 | 0 | |a Carbon gain, allocation and storage in rhizomes in response to elevated atmospheric carbon dioxide and nutrient supply in a perennial C3 grass, Phalaris arundinacea |
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| 520 | |a Reed canary grass (Phalaris arundinacea L.) is a fast-growing, perennial, rhizomatous C3 grass considered as a model invasive species for its aggressive behaviour. The same traits make it a candidate for bioenergy feedstock. We tested the following hypotheses: (1) elevated atmospheric [CO2] and nutrient supply enhance photosynthetic carbon acquisition of this fructan-accumulating grass with little or no photosynthetic downregulation; (2) elevated [CO2] promotes carbon allocation to growth when nutrients are sufficient and to fructan storage in rhizomes when nutrients are low. Plants were grown at ambient or elevated (+320μmolmol-1) [CO2], and fertilised using full or one-eighth strength modified Hoagland solution. We investigated leaf photosynthesis, whole-plant water use, biomass allocation, and nitrogen and carbon storage in rhizomes. Elevated [CO2] enhanced light-saturated net CO2 assimilation by 61%. It doubled whole-plant, stem and root biomass in summer. Plants grown in elevated [CO2] had a greater rate of CO2 assimilation at higher [CO2], indicating a shift in photosynthetic apparatus for enhanced carbon gain under elevated [CO2]. The majority of belowground biomass was allocated to rhizomes for storage rather than to roots in both seasons. In autumn, elevated [CO2] increased fructan concentration in rhizomes from 8.1 to 11.7% of biomass when nutrients were low (P=0.023). Our results suggest that elevated [CO2] combined with sufficient nutrients is likely to enhance carbon gain and growth of P. arundinacea, and to increase its productivity and competitiveness in summer. Elevated [CO2] is likely to enhance long-term fructan storage in rhizomes, which may benefit overwintering and vegetative spread | ||
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