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

doi:10.1046/j.0028-646X.2001.00260.x

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 journal › Article › peer-review

128 Scopus citations

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 (Ψ_w) 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 language	English (US)
Pages (from-to)	231-248
Number of pages	18
Journal	New Phytologist
Volume	152
Issue number	2
DOIs	https://doi.org/10.1046/j.0028-646X.2001.00260.x
State	Published - Nov 13 2001

Keywords

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

ASJC Scopus subject areas

Physiology
Plant Science

Access to Document

10.1046/j.0028-646X.2001.00260.x

Cite this

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, A. (2001). Elevated atmospheric CO₂ improved Sorghum plant water status by ameliorating the adverse effects of drought. New Phytologist, 152(2), 231-248. https://doi.org/10.1046/j.0028-646X.2001.00260.x

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

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title = "Elevated atmospheric CO2 improved Sorghum plant water status by ameliorating the adverse effects of drought",

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.",

keywords = "Carbon dioxide, Free-air CO enrichment (FACE), Global change, Net assimilation rate, Stomatal conductance, Water relations",

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

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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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Y1 - 2001/11/13

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.

KW - Carbon dioxide

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KW - Global change

KW - Net assimilation rate

KW - Stomatal conductance

KW - Water relations

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