Effect of drought stress on gas exchange in channel millet (Echinochloa turneriana) and pearl millet (Pennisetum americanum)

Conference · Tue May 01 04:00:00 EDT 1990 · Plant Physiology, Supplement; (USA)

OSTI ID:5842638

Conover, D G; Sovonick-Dunford, S ^[1]

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1. Univ. of Cincinnati, OH (USA)

Gas exchange measurements were made on well-watered and droughted plants of the drought resistant pearl millet and of channel millet, a potential new crop for semi-arid regions. Photosynthesis and water use efficiency were similar for controls of both species at atmospheric CO{sub 2} levels and were reduced similarly by drought in both species. The CO{sub 2} saturated rate and the carboxylation efficiency were lowered by drought in both species, while stomatal limitation was increased by drought. Autoradiograms indicated that photosynthesis occurs evenly over the surface of well-watered control leaves of both species, but not in leaves of droughted plants. This could result in an overestimate of the effect of nonstomatal inhibition of photosynthesis by drought.

• OSTI ID: 5842638
• Report Number(s): CONF-9007196--
• Conference Information: Journal Name: Plant Physiology, Supplement; (USA) Journal Volume: 93:1
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540210* -- Environment
Terrestrial-- Basic Studies-- (1990-)
551000 -- Physiological Systems
59 BASIC BIOLOGICAL SCIENCES
BIOLOGICAL EFFECTS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CARBOXYLATION
CEREALS
CHALCOGENIDES
CHEMICAL REACTIONS
DROUGHTS
GRAMINEAE
LILIOPSIDA
MAGNOLIOPHYTA
MILLET
OPENINGS
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PLANTS
STOMATA
SYNTHESIS