Effects of atmospheric CO/sub 2/ concentration and water stress on water relations of wheat

Journal Article · Mon Jun 01 04:00:00 EDT 1981 · Bot. Gaz. (Chicago); (United States)

DOI:https://doi.org/10.1086/337212· OSTI ID:6119501

Sionit, N; Strain, B R; Hellmers, H; Kramer, P J

Water status and growth responses of wheat (Triticum aestivuum L. (GWO-1809)) to increased CO/sub 2/ concentration and water stress were studied in controlled-environment chambers. Plants were grown in 350 ..mu..l/liter or 1000 ..mu..1/liter CO/sub 2/ at similar temperature, irradiance, and photoperiod conditions. Groups of plants were subjected to water stress by withholding irrigation for one or two cycles of treatment. In most treatments, decreasing leaf water potential was correlated with decreasing osmotic potential. In leaves grown in both low and high CO/sub 2/ concentrations, the osmotic potentials were lower during the second stress cycle than during the first cycle. The stomata of plants in the low CO/sub 2/ concentration closed at a higher leaf water potential than those in the high CO/sub 2/ concentration. Stem and head production was greater in plants grown in high CO/sub 2/ concentrations than those grown in low CO/sub 2/, perhaps the result of turgor-pressure maintenance as leaf water potential decreased. In controlled-environment chambers, wheat plants adapted to water stress, apparently because of high CO/sub 2/ concentration and repeated stress cycles.

• Research Organization: Duke Univ., Durham, NC
• OSTI ID: 6119501
• Journal Information: Bot. Gaz. (Chicago); (United States), Journal Name: Bot. Gaz. (Chicago); (United States) Vol. 142:2; ISSN BDGAA
• Country of Publication: United States
• Language: English

Related Subjects

560303* -- Chemicals Metabolism & Toxicology-- Plants-- (-1987)
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
BIOLOGICAL EFFECTS
BIOLOGICAL STRESS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CEREALS
CHALCOGENIDES
CHEMICAL REACTIONS
DIFFUSION
GRAMINEAE
GRASS
GROWTH
HYDROGEN COMPOUNDS
LEAVES
OSMOSIS
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PLANT GROWTH
PLANTS
PRODUCTIVITY
QUANTITY RATIO
SOILS
SYNTHESIS
WATER
WHEAT