Effects of low-level SO/sub 2/ on Usnes hirta and Parmelia chlorachroa

Journal Article · Sun Jan 01 00:00:00 EST 1978 · Bryologist; (United States)

DOI:https://doi.org/10.2307/3242239· OSTI ID:5670309

Eversman, S

Respiration rates of Usnea hirta (l.) wigg, and Parmelia chlorochroa tuck exposed in the field to SO/sub 2/ fumigation decreased significantly, compared to control rates, within 30 days at 94 ppB SO/sub 2/ and within 60 days at 33 ppB. Nearly 100% of the algal cells were plasmolyzed within 60 days. The respiration rates of P. chlorochora samples were not significantly different from those of conrol samples after 60 days of exposure to 18 ppB SO/sub 2/. The respiration rates of U. hirta samples were significantly less than those of control samples after 96 days of exposure to 18 ppB SO/sub 2/. A significantly greater percentage of the algal cells were plasmolyzed in U. hirta and P. chlorochroa, compared to control samples, after 31 days of exposure to 18 ppB. Damage to the lichens was more obvious and occurred faster than damage to adjacent vascular vegetation.

• OSTI ID: 5670309
• Journal Information: Bryologist; (United States), Vol. 81:3
• Country of Publication: United States
• Language: English

Related Subjects

63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
54 ENVIRONMENTAL SCIENCES
ALGAE
RESPIRATION
SULFUR DIOXIDE
TOXICITY
AIR POLLUTION
LICHENS
CHALCOGENIDES
FUNGI
OXIDES
OXYGEN COMPOUNDS
PLANTS
POLLUTION
SULFUR COMPOUNDS
SULFUR OXIDES
560303* - Chemicals Metabolism & Toxicology- Plants- (-1987)
500200 - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)