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 language | English (US) |
|---|---|
| Pages (from-to) | 231-248 |
| Number of pages | 18 |
| Journal | New Phytologist |
| Volume | 152 |
| Issue number | 2 |
| DOIs | |
| State | Published - 2001 |
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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 journal › Article
}
TY - JOUR
T1 - Elevated atmospheric CO2 improved Sorghum plant water status by ameliorating the adverse effects of drought
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
PY - 2001
Y1 - 2001
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
KW - Free-air CO enrichment (FACE)
KW - Global change
KW - Net assimilation rate
KW - Stomatal conductance
KW - Water relations
UR - http://www.scopus.com/inward/record.url?scp=0034763740&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0034763740&partnerID=8YFLogxK
U2 - 10.1046/j.0028-646X.2001.00260.x
DO - 10.1046/j.0028-646X.2001.00260.x
M3 - Article
VL - 152
SP - 231
EP - 248
JO - New Phytologist
JF - New Phytologist
SN - 0028-646X
IS - 2
ER -