Acclimation response of spring wheat in a free-air CO2 enrichment (FACE) atmosphere with variable soil nitrogen regimes. 2. Net assimilation and stomatal conductance of leaves

Gerard W. Wall, Neal R. Adam, Talbot J. Brooks, Bruce A. Kimball, Paul J. Pinter, Robert L. Lamorte, Floyd J. Adamsen, Douglas J. Hunsaker, Gabrielle Wechsung, Frank Wechsung, Susanne Grossman-Clarke, Steven W. Leavitt, Allan D. Matthias, Andrew Webber

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

Atmospheric CO2 concentration continues to rise. It is important, therefore, to determine what acclimatory changes will occur within the photosynthetic apparatus of wheat (Triticum aestivum L. cv. Yecora Rojo) grown in a future high-CO2 world at ample and limited soil N contents. Wheat was grown in an open field exposed to the CO2 concentration of ambient air [370 μmol (CO2) mol-1; Control] and air enriched to ∼200 μmol (CO2) mol-1 above ambient using a Free-Air CO2 Enrichment (FACE) apparatus (main plot). A High (35 g m-2) or Low (7 and 1.5 g m-2 for 1996 and 1997, respectfully) level of N was applied to each half of the main CO2 treatment plots (split-plot). Under High-N, FACE reduced stomatal conductance (gs) by 30% at mid-morning (2 h prior to solar noon), 36% at midday (solar noon) and 27% at mid-afternoon (2.5 h after solar noon), whereas under Low-N, gs was reduced by as much as 31% at mid-morning, 44% at midday and 28% at mid-afternoon compared with Control. But, no significant CO2 × N interaction effects occurred. Across seasons and growth stages, daily accumulation of carbon (A′) was 27% greater in FACE than Control. High-N increased A′ by 18% compared with Low-N. In contrast to results for gs, however, significant CO2 × N interaction effects occurred because FACE increased A′ by 30% at High-N, but by only 23% at Low-N. FACE enhanced the seasonal accumulation of carbon (A″) by 29% during 1996 (moderate N-stress), but by only 21% during 1997 (severe N-stress). These results support the premise that in a future high-CO2 world an acclimatory (down-regulation) response in the photosynthetic apparatus of field-grown wheat is anticipated. They also demonstrate, however, that the stimulatory effect of a rise in atmospheric CO2 on carbon gain in wheat can be maintained if nutrients such as nitrogen are in ample supply.

Original languageEnglish (US)
Pages (from-to)79-95
Number of pages17
JournalPhotosynthesis Research
Volume66
Issue number1-2
DOIs
StatePublished - 2000

Fingerprint

Earth atmosphere
Acclimatization
spring wheat
Atmosphere
Triticum
stomatal conductance
assimilation (physiology)
acclimation
Nitrogen
Soil
carbon dioxide
Air
Soils
air
nitrogen
leaves
soil
Carbon
wheat
Nutrients

Keywords

  • Acclimation
  • Climate change
  • CO
  • Down-regulation
  • Global change
  • Photosynthesis
  • Stomatal conductance

ASJC Scopus subject areas

  • Plant Science

Cite this

Acclimation response of spring wheat in a free-air CO2 enrichment (FACE) atmosphere with variable soil nitrogen regimes. 2. Net assimilation and stomatal conductance of leaves. / Wall, Gerard W.; Adam, Neal R.; Brooks, Talbot J.; Kimball, Bruce A.; Pinter, Paul J.; Lamorte, Robert L.; Adamsen, Floyd J.; Hunsaker, Douglas J.; Wechsung, Gabrielle; Wechsung, Frank; Grossman-Clarke, Susanne; Leavitt, Steven W.; Matthias, Allan D.; Webber, Andrew.

In: Photosynthesis Research, Vol. 66, No. 1-2, 2000, p. 79-95.

Research output: Contribution to journalArticle

Wall, GW, Adam, NR, Brooks, TJ, Kimball, BA, Pinter, PJ, Lamorte, RL, Adamsen, FJ, Hunsaker, DJ, Wechsung, G, Wechsung, F, Grossman-Clarke, S, Leavitt, SW, Matthias, AD & Webber, A 2000, 'Acclimation response of spring wheat in a free-air CO2 enrichment (FACE) atmosphere with variable soil nitrogen regimes. 2. Net assimilation and stomatal conductance of leaves', Photosynthesis Research, vol. 66, no. 1-2, pp. 79-95. https://doi.org/10.1023/A:1010646225929
Wall, Gerard W. ; Adam, Neal R. ; Brooks, Talbot J. ; Kimball, Bruce A. ; Pinter, Paul J. ; Lamorte, Robert L. ; Adamsen, Floyd J. ; Hunsaker, Douglas J. ; Wechsung, Gabrielle ; Wechsung, Frank ; Grossman-Clarke, Susanne ; Leavitt, Steven W. ; Matthias, Allan D. ; Webber, Andrew. / Acclimation response of spring wheat in a free-air CO2 enrichment (FACE) atmosphere with variable soil nitrogen regimes. 2. Net assimilation and stomatal conductance of leaves. In: Photosynthesis Research. 2000 ; Vol. 66, No. 1-2. pp. 79-95.
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abstract = "Atmospheric CO2 concentration continues to rise. It is important, therefore, to determine what acclimatory changes will occur within the photosynthetic apparatus of wheat (Triticum aestivum L. cv. Yecora Rojo) grown in a future high-CO2 world at ample and limited soil N contents. Wheat was grown in an open field exposed to the CO2 concentration of ambient air [370 μmol (CO2) mol-1; Control] and air enriched to ∼200 μmol (CO2) mol-1 above ambient using a Free-Air CO2 Enrichment (FACE) apparatus (main plot). A High (35 g m-2) or Low (7 and 1.5 g m-2 for 1996 and 1997, respectfully) level of N was applied to each half of the main CO2 treatment plots (split-plot). Under High-N, FACE reduced stomatal conductance (gs) by 30{\%} at mid-morning (2 h prior to solar noon), 36{\%} at midday (solar noon) and 27{\%} at mid-afternoon (2.5 h after solar noon), whereas under Low-N, gs was reduced by as much as 31{\%} at mid-morning, 44{\%} at midday and 28{\%} at mid-afternoon compared with Control. But, no significant CO2 × N interaction effects occurred. Across seasons and growth stages, daily accumulation of carbon (A′) was 27{\%} greater in FACE than Control. High-N increased A′ by 18{\%} compared with Low-N. In contrast to results for gs, however, significant CO2 × N interaction effects occurred because FACE increased A′ by 30{\%} at High-N, but by only 23{\%} at Low-N. FACE enhanced the seasonal accumulation of carbon (A″) by 29{\%} during 1996 (moderate N-stress), but by only 21{\%} during 1997 (severe N-stress). These results support the premise that in a future high-CO2 world an acclimatory (down-regulation) response in the photosynthetic apparatus of field-grown wheat is anticipated. They also demonstrate, however, that the stimulatory effect of a rise in atmospheric CO2 on carbon gain in wheat can be maintained if nutrients such as nitrogen are in ample supply.",
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AU - Adam, Neal R.

AU - Brooks, Talbot J.

AU - Kimball, Bruce A.

AU - Pinter, Paul J.

AU - Lamorte, Robert L.

AU - Adamsen, Floyd J.

AU - Hunsaker, Douglas J.

AU - Wechsung, Gabrielle

AU - Wechsung, Frank

AU - Grossman-Clarke, Susanne

AU - Leavitt, Steven W.

AU - Matthias, Allan D.

AU - Webber, Andrew

PY - 2000

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N2 - Atmospheric CO2 concentration continues to rise. It is important, therefore, to determine what acclimatory changes will occur within the photosynthetic apparatus of wheat (Triticum aestivum L. cv. Yecora Rojo) grown in a future high-CO2 world at ample and limited soil N contents. Wheat was grown in an open field exposed to the CO2 concentration of ambient air [370 μmol (CO2) mol-1; Control] and air enriched to ∼200 μmol (CO2) mol-1 above ambient using a Free-Air CO2 Enrichment (FACE) apparatus (main plot). A High (35 g m-2) or Low (7 and 1.5 g m-2 for 1996 and 1997, respectfully) level of N was applied to each half of the main CO2 treatment plots (split-plot). Under High-N, FACE reduced stomatal conductance (gs) by 30% at mid-morning (2 h prior to solar noon), 36% at midday (solar noon) and 27% at mid-afternoon (2.5 h after solar noon), whereas under Low-N, gs was reduced by as much as 31% at mid-morning, 44% at midday and 28% at mid-afternoon compared with Control. But, no significant CO2 × N interaction effects occurred. Across seasons and growth stages, daily accumulation of carbon (A′) was 27% greater in FACE than Control. High-N increased A′ by 18% compared with Low-N. In contrast to results for gs, however, significant CO2 × N interaction effects occurred because FACE increased A′ by 30% at High-N, but by only 23% at Low-N. FACE enhanced the seasonal accumulation of carbon (A″) by 29% during 1996 (moderate N-stress), but by only 21% during 1997 (severe N-stress). These results support the premise that in a future high-CO2 world an acclimatory (down-regulation) response in the photosynthetic apparatus of field-grown wheat is anticipated. They also demonstrate, however, that the stimulatory effect of a rise in atmospheric CO2 on carbon gain in wheat can be maintained if nutrients such as nitrogen are in ample supply.

AB - Atmospheric CO2 concentration continues to rise. It is important, therefore, to determine what acclimatory changes will occur within the photosynthetic apparatus of wheat (Triticum aestivum L. cv. Yecora Rojo) grown in a future high-CO2 world at ample and limited soil N contents. Wheat was grown in an open field exposed to the CO2 concentration of ambient air [370 μmol (CO2) mol-1; Control] and air enriched to ∼200 μmol (CO2) mol-1 above ambient using a Free-Air CO2 Enrichment (FACE) apparatus (main plot). A High (35 g m-2) or Low (7 and 1.5 g m-2 for 1996 and 1997, respectfully) level of N was applied to each half of the main CO2 treatment plots (split-plot). Under High-N, FACE reduced stomatal conductance (gs) by 30% at mid-morning (2 h prior to solar noon), 36% at midday (solar noon) and 27% at mid-afternoon (2.5 h after solar noon), whereas under Low-N, gs was reduced by as much as 31% at mid-morning, 44% at midday and 28% at mid-afternoon compared with Control. But, no significant CO2 × N interaction effects occurred. Across seasons and growth stages, daily accumulation of carbon (A′) was 27% greater in FACE than Control. High-N increased A′ by 18% compared with Low-N. In contrast to results for gs, however, significant CO2 × N interaction effects occurred because FACE increased A′ by 30% at High-N, but by only 23% at Low-N. FACE enhanced the seasonal accumulation of carbon (A″) by 29% during 1996 (moderate N-stress), but by only 21% during 1997 (severe N-stress). These results support the premise that in a future high-CO2 world an acclimatory (down-regulation) response in the photosynthetic apparatus of field-grown wheat is anticipated. They also demonstrate, however, that the stimulatory effect of a rise in atmospheric CO2 on carbon gain in wheat can be maintained if nutrients such as nitrogen are in ample supply.

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KW - Climate change

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KW - Global change

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