Dark/light modulation of ribulose bisphosphate carboxylase activity in plants from different photosynthetic categories
Journal Article
·
· Plant Physiol.; (United States)
Ribulose bisphosphate carboxylase/oxygenase (RuBPCase) from several plants had substantially greater activity in extracts from light-exposed leaves than dark leaves, even when the extracts were incubated in vitro with saturating HCO/sub 3//sup -/ and Mg/sup 2 +/ concentrations. This occurred in Glycine max, Lycopersicon esculentum, Nicotiana tabacum, Panicum bisulcatum, and P. hylaeicum (C/sub 3/); P. maximum (C/sub 4/ phosphoenolpyruvate carboxykinase); P. milioides (C/sub 3//C/sub 4/); and Bromelia pinguin and Ananas comosus (Crassulacean acid metabolism). Little or no difference between light and dark leaf extracts of RuBPCase was observed in Triticum aestivum (C/sub 3/); P. miliaceum (C/sub 4/ NAD malic enzyme); Zea mays and Sorghum bicolor (C/sub 4/ NADP malic enzyme); Moricandia arvensis (C/sub 3//C/sub 4/); and Hydrilla verticillata (submersed aquatic macrophyte). It is concluded that, in many plants, especially Crassulacean acid metabolism and C/sub 3/ species, a large fraction of ribulose-1,5-bisphosphate carboxylase/oxygenase in the dark is in an inactivatable state that cannot respond to CO/sub 2/ and Mg/sup 2 +/ activation, but which can be converted to an activatable state upon exposure of the leaf to light. 16 references, 2 tables.
- Research Organization:
- Univ. of Florida, Gainesville
- DOE Contract Number:
- AI01-81ER60001
- OSTI ID:
- 6057276
- Journal Information:
- Plant Physiol.; (United States), Journal Name: Plant Physiol.; (United States) Vol. 76:3; ISSN PLPHA
- Country of Publication:
- United States
- Language:
- English
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Thu Feb 28 23:00:00 EST 1985
· Plant Physiol.; (United States)
·
OSTI ID:5806470
Biochemical and physiological characterization of higher plants with reduced photorespiration. Progress report, May 25, 1981-March 1, 1982
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Thu Dec 31 23:00:00 EST 1981
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Biochemical and physiological characterization of higher plants with reduced photorespiration: Final report for period May 25, 1981-May 24, 1985
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Sat Aug 01 00:00:00 EDT 1987
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OSTI ID:6269008
Related Subjects
550500* -- Metabolism
59 BASIC BIOLOGICAL SCIENCES
CARBOXYLASE
CEREALS
DAILY VARIATIONS
ELECTROMAGNETIC RADIATION
ENZYME ACTIVITY
ENZYMES
FOOD
GRASS
HERBS
IN VITRO
LEAVES
LIGASES
MAIZE
MILLET
NICOTIANA
OXIDOREDUCTASES
OXYGENASES
PLANTS
RADIATIONS
SOYBEANS
VARIATIONS
VEGETABLES
VISIBLE RADIATION
WHEAT
59 BASIC BIOLOGICAL SCIENCES
CARBOXYLASE
CEREALS
DAILY VARIATIONS
ELECTROMAGNETIC RADIATION
ENZYME ACTIVITY
ENZYMES
FOOD
GRASS
HERBS
IN VITRO
LEAVES
LIGASES
MAIZE
MILLET
NICOTIANA
OXIDOREDUCTASES
OXYGENASES
PLANTS
RADIATIONS
SOYBEANS
VARIATIONS
VEGETABLES
VISIBLE RADIATION
WHEAT