Inhibition of cyclic photophosphorylation by peroxyacetyl nitrate
The present paper describes the inhibitory effect of PAN on cyclic photophosphorylation by chloroplasts isolated from Black Valentine bean leaves. If the photophosphorylation reaction mixture is gassed with PAN during the assay, inhibition of photophosphorylation results. Moreover, inhibition of photophosphorylation is also observed if the complete reaction mixture containing the chloroplasts is gassed in complete darkness with PAN immediately before but not during the photophosphorylation assay. The second observation is of considerable interest in view of the fact that intact bean plants do not damage from PAN fumigation unless light is present before, during and after the fumigation. Inhibition of photophosphorylation by PAN gassing of the chloroplasts either as the assay is performed or in the dark prior to the assay is caused by catalytic amounts of PAN. Both types of gassing result in an increase in inhibition which is linear with respect to the increase in PAN. However, the quantity required to cause a given degree of inhibition by gassing during the assay is greater than the quantity required to cause a similar degree of inhibition as a result of dark gassing. That this is not an indirect effect has not been completely ruled out.
- Research Organization:
- Univ. of California, Riverside
- OSTI ID:
- 5264555
- Journal Information:
- Plant Physiol.; (United States), Journal Name: Plant Physiol.; (United States) Vol. 38; ISSN PLPHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
BIOLOGICAL EFFECTS
CELL CONSTITUENTS
CHEMICAL REACTIONS
CHLOROPLASTS
DOSE-RESPONSE RELATIONSHIPS
ELECTROMAGNETIC RADIATION
ESTERS
INHIBITION
LEAVES
LEGUMINOSAE
NITRATES
NITRIC ACID ESTERS
NITROGEN COMPOUNDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PEROXYACETYL NITRATE
PHASEOLUS
PHOSPHORYLATION
PLANTS
RADIATIONS
RESPONSE MODIFYING FACTORS
SMOG
VISIBLE RADIATION