Carbon isotope discrimination by Sorghum bicolor under CO2 enrichment and drought

D. G. Williams, V. Gempko, A. Fravolini, Steven Leavitt, G. W. Wall, B. A. Kimball, P. J. Pinter, R. LaMorte, Michael J Ottman

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

• Sorghum bicolor was exposed to free-air CO2 enrichment (FACE) and drought at the Maricopa Agricultural Center, AZ, USA, in summer 1998. We predicted that bundle sheath leakiness (Φ) would be insensitive to FACE under well-irrigated (wet) conditions, but would be lower in FACE compared with control-CO2 treatments when irrigation was withheld (dry). • Leaf and air δ13C values and leaf pi/pa from gas exchange were measured to estimate carbon isotope discrimination (Δ) and Φ. Midday leaf water potential (Ψ) and photosynthetic rate were simultaneously measured to evaluate the influence of plant water status on Φ and the association between Φ and carbon gain. • Irrigation treatments affected Ψ, pi/pa, Δ and Φ in control CO2 and FACE rings. Differences in leaf Δ between wet- and dry-treatment plots resulted from changes in Φ and to stomatal influences on pi/pa. FACE had very little effect on Ψ, Δ and Φ in wet-treatment plots. However, Φ and Δ in dry plots were higher in control than in FACE rings. • FACE ameliorated the effects of drought on bundle sheath leakiness and Δ by reducing transpiration, prolonging soil water availability and enhancing plant water status. Direct effects of CO2 enrichment on C4 photosynthetic metabolism in Sorghum apparently are minimal and indirect effects depend on soil water supply.

Original languageEnglish (US)
Pages (from-to)285-293
Number of pages9
JournalNew Phytologist
Volume150
Issue number2
DOIs
StatePublished - 2001

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Carbon Isotopes
Sorghum
Drought
Droughts
Sorghum bicolor
isotopes
carbon dioxide
Air
drought
carbon
air
Water
Irrigation
Soil
Soils
Transpiration
Water Supply
irrigation
leaves
Water supply

Keywords

  • Bundle sheath leakiness
  • C photosynthesis
  • Carbon isotope discrimination
  • Drought
  • Elevated CO
  • FACE
  • Free-air CO enrichment
  • Sorghum bicolor

ASJC Scopus subject areas

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

Cite this

Carbon isotope discrimination by Sorghum bicolor under CO2 enrichment and drought. / Williams, D. G.; Gempko, V.; Fravolini, A.; Leavitt, Steven; Wall, G. W.; Kimball, B. A.; Pinter, P. J.; LaMorte, R.; Ottman, Michael J.

In: New Phytologist, Vol. 150, No. 2, 2001, p. 285-293.

Research output: Contribution to journalArticle

Williams, DG, Gempko, V, Fravolini, A, Leavitt, S, Wall, GW, Kimball, BA, Pinter, PJ, LaMorte, R & Ottman, MJ 2001, 'Carbon isotope discrimination by Sorghum bicolor under CO2 enrichment and drought', New Phytologist, vol. 150, no. 2, pp. 285-293. https://doi.org/10.1046/j.1469-8137.2001.00093.x
Williams, D. G. ; Gempko, V. ; Fravolini, A. ; Leavitt, Steven ; Wall, G. W. ; Kimball, B. A. ; Pinter, P. J. ; LaMorte, R. ; Ottman, Michael J. / Carbon isotope discrimination by Sorghum bicolor under CO2 enrichment and drought. In: New Phytologist. 2001 ; Vol. 150, No. 2. pp. 285-293.
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