Inhibition of photosystem II in isolated chloroplasts by lead

Journal Article · Sat Jan 01 04:00:00 EST 1972 · Plant Physiol.; (United States)

DOI:https://doi.org/10.1104/pp.49.5.820· OSTI ID:6093856

Miles, C D; Brandle, J R; Daniel, D J; Chu-Der, O; Schnare, P D; Uhlik, D J

Inhibition of photosynthetic electron transport in isolated chloroplasts by lead salts has been demonstrated in spinach and tomatoes. Photosystem I activity, as measured by electron transfer from dichlorophenol indophenol to methylviologen, was not reduced by such treatment. However, photosystem II was inhibited by lead salts when electron flow was measured from water to methylviologen and Hill reaction or by chlorophyll fluorescence. Fluorescence induction curves indicated the primary site of inhibition was on the oxidizing side of photosystem II, that this site was between the primary electron donor of photosystem II and the site of water oxidation could be demonstrated by hydroxylamine restoration of normal fluorescence following lead inhibition.

• Research Organization: Univ. of Missouri, Columbia
• OSTI ID: 6093856
• Journal Information: Plant Physiol.; (United States), Journal Name: Plant Physiol.; (United States) Vol. 49:5; ISSN PLPHA
• Country of Publication: United States
• Language: English

Related Subjects

560303* -- Chemicals Metabolism & Toxicology-- Plants-- (-1987)
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
AMINES
BINDING ENERGY
BIOLOGICAL EFFECTS
BIOLOGICAL LOCALIZATION
CARBOXYLIC ACIDS
CELL CONSTITUENTS
CHEMICAL REACTIONS
CHLOROPHYLL
CHLOROPLASTS
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY
FERMIONS
FLUORESCENCE
FOOD
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
HYDROXYLAMINE
INHIBITION
LEAD
LEPTONS
LUMINESCENCE
METALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PHYTOCHROMES
PIGMENTS
PLANTS
PORPHYRINS
SPINACH
SYNTHESIS
TOMATOES
VALENCE
VEGETABLES