Elevated atmospheric CO2 improved Sorghum plant water status by ameliorating the adverse effects of drought

G. W. Wall, T. J. Brooks, N. R. Adam, A. B. Cousins, B. A. Kimball, P. J. Pinter, R. L. LaMorte, J. Triggs, M. J. Ottman, S. W. Leavitt, A. D. Matthias, D. G. Williams, Andrew Webber

Research output: Contribution to journalArticle

105 Citations (Scopus)

Abstract

The interactive effects of atmospheric CO2 concentration and soil-water content on grain sorghum (Sorghum bicolor) are reported here. Sorghum plants were exposed to ambient (control) and free-air CO2 enrichment (FACE; ambient + 200 μmol mol-1), under ample (wet, 100% replacement of evapo-transpiration) and reduced (dry, postplanting and mid-season irrigations) water supply over two growing seasons. FACE reduced seasonal average stomatal conductance (g5) by 0.17 mol (H2O) m-2 s-1 (32% and 37% for dry and wet, respectively) compared with control; this was similar to the difference between dry and wet treatments. FACE increased net assimilation rate (A) by 4.77 μmol (CO2) m-2s-1 (23% and 9% for dry and wet, respectively), whereas dry decreased A by 10.50 μmol (CO2) m-2s-1 (26%) compared with wet. Total plant water potential (Ψw) was 0.16 MPa (9%) and 0.04 MPa (3%) less negative in FACE than in the control treatment for dry and wet, respectively. Under dry, FACE stimulated final shoot biomass by 15%. By ameliorating the adverse effects of drought, elevated atmospheric CO2 improved plant water status, which indirectly caused an increase in carbon gain.

Original languageEnglish (US)
Pages (from-to)231-248
Number of pages18
JournalNew Phytologist
Volume152
Issue number2
DOIs
StatePublished - 2001

Fingerprint

Sorghum
Drought
Droughts
Sorghum (Poaceae)
adverse effects
carbon dioxide
drought
Water
Transpiration
Water Supply
water
Water supply
Irrigation
Biomass
Water content
Soil
Carbon
Air
net assimilation rate
Soils

Keywords

  • Carbon dioxide
  • Free-air CO enrichment (FACE)
  • Global change
  • Net assimilation rate
  • Stomatal conductance
  • Water relations

ASJC Scopus subject areas

  • Plant Science
  • Biochemistry, Genetics and Molecular Biology(all)
  • Biochemistry

Cite this

Elevated atmospheric CO2 improved Sorghum plant water status by ameliorating the adverse effects of drought. / Wall, G. W.; Brooks, T. J.; Adam, N. R.; Cousins, A. B.; Kimball, B. A.; Pinter, P. J.; LaMorte, R. L.; Triggs, J.; Ottman, M. J.; Leavitt, S. W.; Matthias, A. D.; Williams, D. G.; Webber, Andrew.

In: New Phytologist, Vol. 152, No. 2, 2001, p. 231-248.

Research output: Contribution to journalArticle

Wall, GW, Brooks, TJ, Adam, NR, Cousins, AB, Kimball, BA, Pinter, PJ, LaMorte, RL, Triggs, J, Ottman, MJ, Leavitt, SW, Matthias, AD, Williams, DG & Webber, A 2001, 'Elevated atmospheric CO2 improved Sorghum plant water status by ameliorating the adverse effects of drought', New Phytologist, vol. 152, no. 2, pp. 231-248. https://doi.org/10.1046/j.0028-646X.2001.00260.x
Wall, G. W. ; Brooks, T. J. ; Adam, N. R. ; Cousins, A. B. ; Kimball, B. A. ; Pinter, P. J. ; LaMorte, R. L. ; Triggs, J. ; Ottman, M. J. ; Leavitt, S. W. ; Matthias, A. D. ; Williams, D. G. ; Webber, Andrew. / Elevated atmospheric CO2 improved Sorghum plant water status by ameliorating the adverse effects of drought. In: New Phytologist. 2001 ; Vol. 152, No. 2. pp. 231-248.
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abstract = "The interactive effects of atmospheric CO2 concentration and soil-water content on grain sorghum (Sorghum bicolor) are reported here. Sorghum plants were exposed to ambient (control) and free-air CO2 enrichment (FACE; ambient + 200 μmol mol-1), under ample (wet, 100{\%} replacement of evapo-transpiration) and reduced (dry, postplanting and mid-season irrigations) water supply over two growing seasons. FACE reduced seasonal average stomatal conductance (g5) by 0.17 mol (H2O) m-2 s-1 (32{\%} and 37{\%} for dry and wet, respectively) compared with control; this was similar to the difference between dry and wet treatments. FACE increased net assimilation rate (A) by 4.77 μmol (CO2) m-2s-1 (23{\%} and 9{\%} for dry and wet, respectively), whereas dry decreased A by 10.50 μmol (CO2) m-2s-1 (26{\%}) compared with wet. Total plant water potential (Ψw) was 0.16 MPa (9{\%}) and 0.04 MPa (3{\%}) less negative in FACE than in the control treatment for dry and wet, respectively. Under dry, FACE stimulated final shoot biomass by 15{\%}. By ameliorating the adverse effects of drought, elevated atmospheric CO2 improved plant water status, which indirectly caused an increase in carbon gain.",
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AU - Wall, G. W.

AU - Brooks, T. J.

AU - Adam, N. R.

AU - Cousins, A. B.

AU - Kimball, B. A.

AU - Pinter, P. J.

AU - LaMorte, R. L.

AU - Triggs, J.

AU - Ottman, M. J.

AU - Leavitt, S. W.

AU - Matthias, A. D.

AU - Williams, D. G.

AU - Webber, Andrew

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N2 - The interactive effects of atmospheric CO2 concentration and soil-water content on grain sorghum (Sorghum bicolor) are reported here. Sorghum plants were exposed to ambient (control) and free-air CO2 enrichment (FACE; ambient + 200 μmol mol-1), under ample (wet, 100% replacement of evapo-transpiration) and reduced (dry, postplanting and mid-season irrigations) water supply over two growing seasons. FACE reduced seasonal average stomatal conductance (g5) by 0.17 mol (H2O) m-2 s-1 (32% and 37% for dry and wet, respectively) compared with control; this was similar to the difference between dry and wet treatments. FACE increased net assimilation rate (A) by 4.77 μmol (CO2) m-2s-1 (23% and 9% for dry and wet, respectively), whereas dry decreased A by 10.50 μmol (CO2) m-2s-1 (26%) compared with wet. Total plant water potential (Ψw) was 0.16 MPa (9%) and 0.04 MPa (3%) less negative in FACE than in the control treatment for dry and wet, respectively. Under dry, FACE stimulated final shoot biomass by 15%. By ameliorating the adverse effects of drought, elevated atmospheric CO2 improved plant water status, which indirectly caused an increase in carbon gain.

AB - The interactive effects of atmospheric CO2 concentration and soil-water content on grain sorghum (Sorghum bicolor) are reported here. Sorghum plants were exposed to ambient (control) and free-air CO2 enrichment (FACE; ambient + 200 μmol mol-1), under ample (wet, 100% replacement of evapo-transpiration) and reduced (dry, postplanting and mid-season irrigations) water supply over two growing seasons. FACE reduced seasonal average stomatal conductance (g5) by 0.17 mol (H2O) m-2 s-1 (32% and 37% for dry and wet, respectively) compared with control; this was similar to the difference between dry and wet treatments. FACE increased net assimilation rate (A) by 4.77 μmol (CO2) m-2s-1 (23% and 9% for dry and wet, respectively), whereas dry decreased A by 10.50 μmol (CO2) m-2s-1 (26%) compared with wet. Total plant water potential (Ψw) was 0.16 MPa (9%) and 0.04 MPa (3%) less negative in FACE than in the control treatment for dry and wet, respectively. Under dry, FACE stimulated final shoot biomass by 15%. By ameliorating the adverse effects of drought, elevated atmospheric CO2 improved plant water status, which indirectly caused an increase in carbon gain.

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KW - Net assimilation rate

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KW - Water relations

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