Possible role for abscisic acid in regulation of photosynthetic and photorespiratory carbon metabolism in barley leaves. [Hordeum vulgare]

Journal Article · Wed Apr 01 04:00:00 EST 1987 · Plant Physiol.; (United States)

OSTI ID:6020747

Popova, L P; Tsonev, T D; Vaklinova, S G

The influence of abscisic acid (ABA) on carbon metabolism, rate of photorespiration, and the activity of the photorespiratory enzymes ribulose bisphosphate oxygenase and glycolate oxidase in 7-day-old barley seedlings (Hordeum vulgare L. var. Alfa) was investigated. Plants treated with ABA had enhanced incorporation of labeled carbon from /sup 14/CO/sub 2/ into glycolic acid, glycine, and serine, while /sup 14/C incorporation into 3-phosphoglyceric acid and sugarphosphate esters was depressed. Parallel with this effect, treated plants showed a rise in activity of RuBP oxygenase and glycolic acid oxidase. The rate of photorespiration was increased twofold by ABA treatment at IO/sup -6/ molar while the CO/sub 2/-compensation point increased 46% and stomatal resistance increased more than twofold over control plants.

• Research Organization: Popov Institute of Plant Physiology, Sofia, Bulgaria
• OSTI ID: 6020747
• Journal Information: Plant Physiol.; (United States), Journal Name: Plant Physiol.; (United States) Vol. 83:4; ISSN PLPHA
• Country of Publication: United States
• Language: English

Related Subjects

551001* -- Physiological Systems-- Tracer Techniques
59 BASIC BIOLOGICAL SCIENCES
ANABOLISM
BARLEY
BIOLOGICAL EFFECTS
CARBON 14 COMPOUNDS
CARBON DIOXIDE FIXATION
CEREALS
CHEMICAL REACTIONS
ENZYME ACTIVITY
ENZYMES
GRASS
HORMONES
ISOTOPE APPLICATIONS
LABELLED COMPOUNDS
METABOLISM
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXIDOREDUCTASES
OXYGENASES
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PHYSIOLOGY
PLANTS
RESPIRATION
SYNTHESIS
TRACER TECHNIQUES