Response of photosynthesis and the cellular antioxidant system to ozone in populus leaves

Journal Article · Fri Mar 31 23:00:00 EST 1989 · Plant Physiology, Supplement; (USA)

OSTI ID:6991862

Sen-Gupta, A; McCune, D C ^[1]; Alscher, R

---

1. Boyce Thompson Institute, Ithaca, NY (USA)

Atmospheric ozone causes various highly reactive intermediates (eg. peroxyl and superoxide radicals, H{sub 2}O{sub 2} etc.) to form in plant tissues. A plants productivity in environments with ozone may be related to its ability to scavenge the free radicals formed. The effects of ozone on photosynthesis (PS) and some free radical scavengers were measured in poplars (fifth emergent leaf). Clonal poplars (P. deltoides X P. cv. caudina) were grown and fumigated with 180 ppb ozone for 3 h at appropriate times. Total glutathione (GSH GSSG) increased in fumigated leaves. The ratio of GSH/GSSG decreased from 18.8 to 1.2 in fumigated plants. Superoxide dismutase levels increased 2-fold in fumigated plants. PS declined approx. 50% in fumigated plants even though electron transport and HADPH levels were unaffected. We speculate that reduced PS may be due to a diversion of energy to ozone adaptation processes.

• OSTI ID: 6991862
• Journal Information: Plant Physiology, Supplement; (USA), Journal Name: Plant Physiology, Supplement; (USA) Vol. 89:4; ISSN PPYSA; ISSN 0079-2241
• Country of Publication: United States
• Language: English

Related Subjects

560300* -- Chemicals Metabolism & Toxicology
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
BIOLOGICAL ADAPTATION
BODY
CHEMICAL REACTIONS
DRUGS
ENZYME ACTIVITY
ENZYMES
GLUTATHIONE
HYDROGEN COMPOUNDS
HYDROGEN PEROXIDE
MAGNOLIOPHYTA
MAGNOLIOPSIDA
ORGANIC COMPOUNDS
OXIDOREDUCTASES
OXYGEN COMPOUNDS
OZONE
PEPTIDES
PEROXIDES
PEROXY RADICALS
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PLANT TISSUES
PLANTS
POLYPEPTIDES
POPLARS
PROTEINS
RADICALS
RADIOPROTECTIVE SUBSTANCES
SCAVENGING
SUPEROXIDE DISMUTASE
SUPEROXIDE RADICALS
SYNTHESIS
TISSUES
TOXICITY
TREES