Carbon pools in low- and high-photorespiratory Hydrilla
Conference
·
· Plant Physiol., Suppl.; (United States)
OSTI ID:5725939
Differences were found in the internal inorganic carbon (C/sub i/) pools of C/sub i/-starved, low- and high-photorespiratory (PR) Hydrilla leaves exposed to 0.5 mM NaH/sup 14/CO/sub 3/ at high and low external pH. At pH 5 in the light the C/sub i/ level in low-PR plants reached 5.5 mM in 20 s, dropping to a steady-state of 2.5 mM at 60 s. Low-PR plant C/sub i/ levels were twice those of the high-PR. Similar, but lower (50%), trends occurred at pH 9. Fixation of /sup 14/C was similar in both PR states at pH 5, but at pH 9 it was 6-fold greater in low-PR plants. C/sub i/ accumulation occurred in the dark, except in high-PR plants. There was little dark fixation. An internal pH of 8.3 (light) and 8.1 (dark) was found. Calculations indicated that at pH 9 low- and high-PR plants concentrated free CO/sub 2/ 25- and 7-fold, respectively. DCMU incubation decreased /sup 14/C incorporation into the C/sub i/ and fixed fractions by 85% and 75%, respectively, indicating a role for non-cyclic photophosphorylation in C/sub i/ accumulation and photosynthetic fixation. In the dark DCMU caused no inhibition of C/sub i/ accumulation.
- Research Organization:
- Univ. of Florida, Gainesville
- OSTI ID:
- 5725939
- Report Number(s):
- CONF-8707108-
- Conference Information:
- Journal Name: Plant Physiol., Suppl.; (United States) Journal Volume: 83:4
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
550201* -- Biochemistry-- Tracer Techniques
59 BASIC BIOLOGICAL SCIENCES
AQUATIC ORGANISMS
BIOCHEMICAL REACTION KINETICS
BIOLOGICAL ACCUMULATION
CARBON
CARBON 14 COMPOUNDS
CARBON DIOXIDE FIXATION
CARBONIC ACID DERIVATIVES
CHEMICAL REACTIONS
ELECTROMAGNETIC RADIATION
ELEMENTS
INHIBITION
ISOTOPE APPLICATIONS
KINETICS
LABELLED COMPOUNDS
NONMETALS
NUTRITIONAL DEFICIENCY
ORGANIC COMPOUNDS
PH VALUE
PHOSPHORYLATION
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
RADIATIONS
REACTION KINETICS
RESPIRATION
SYNTHESIS
TRACER TECHNIQUES
VISIBLE RADIATION
59 BASIC BIOLOGICAL SCIENCES
AQUATIC ORGANISMS
BIOCHEMICAL REACTION KINETICS
BIOLOGICAL ACCUMULATION
CARBON
CARBON 14 COMPOUNDS
CARBON DIOXIDE FIXATION
CARBONIC ACID DERIVATIVES
CHEMICAL REACTIONS
ELECTROMAGNETIC RADIATION
ELEMENTS
INHIBITION
ISOTOPE APPLICATIONS
KINETICS
LABELLED COMPOUNDS
NONMETALS
NUTRITIONAL DEFICIENCY
ORGANIC COMPOUNDS
PH VALUE
PHOSPHORYLATION
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
RADIATIONS
REACTION KINETICS
RESPIRATION
SYNTHESIS
TRACER TECHNIQUES
VISIBLE RADIATION