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Metabolic responses to auxin. V. Dissociation by carbon monoxide of effects of indoleacetic acid on growth and respiration

Journal Article · · Plant Physiol.; (United States)
DOI:https://doi.org/10.1104/pp.35.1.45· OSTI ID:5775249
; ;

In isolated pea internode segments the effect of indoleacetic acid on oxygen uptake is completely suppressed, or reversed, by a carbon monoxide/oxygen ratio of 2.8/1, which inhibits only 20 to 25% of the basal respiration. The reversal by light of the CO induced inhibition is followed by the abrupt reappearance of the auxin effect on respiration, which almost immediately reaches its maximum level. A marked stimulation of growth is observed even in the presence of a 2.8/1 CO/O/sub 2/ ratio, which completely inhibits the effect on respiration. The ratio (growth with indoleacetic acid/growth in water) is even slightly higher with CO than in normal air. The absolute growth values of the segments treated with indoleacetic acid and CO at 2.8/1 ratio (in the dark) are consistently higher than those of the controls in distilled water and air, though the O/sub 2/ uptake in the former is about 25% lower than in the latter. 9 references, 1 table.

Research Organization:
Univ. of Milan, Italy
OSTI ID:
5775249
Journal Information:
Plant Physiol.; (United States), Journal Name: Plant Physiol.; (United States) Vol. 35:1; ISSN PLPHA
Country of Publication:
United States
Language:
English

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Related Subjects

560303* -- Chemicals Metabolism & Toxicology-- Plants-- (-1987)
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
AROMATICS
AUXINS
AZAARENES
AZOLES
BIOLOGICAL EFFECTS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
DATA
ELEMENTS
EXPERIMENTAL DATA
GROWTH
HETEROCYCLIC COMPOUNDS
INDOLES
INFORMATION
LEGUMINOSAE
METABOLISM
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PISUM
PLANT GROWTH
PLANT GROWTH REGULATORS
PLANTS
PYRROLES
RESPIRATION
STIMULATION
UPTAKE