Trends in Pinus ponderosa foliar pigment concentration due to chronic exposure of ozone and acid rain

Conference · Wed May 01 04:00:00 EDT 1991 · Plant Physiology, Supplement; (United States)

OSTI ID:5512278

Neuman, L ^[1]; Houpis, J; Anderson, P ^[2]

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1. California State Univ., Chico (United States)
2. Lawrence Livermore National Lab., CA (United States)

To determine the effects of ozone and acid rain on mature Ponderosa pine trees, Lawrence Livermore National Lab. has collaborated with University of California Berkeley, University of California Davis, California State University Chico, and the US Forest Service at the latter's Chico Tree Improvement Center. Foliar tissue from mature grafted scions of Pinus ponderosa were exposed to two times ambient ozone for ten months and to acid rain (3.0 pH) weekly for 10 weeks using branch exposure chambers. Pigment extracts were analyzed spectrophotometrically for concentrations of chlorophylls a and b, and carotenoid pigments, at 662 nm, 644 nm, and 470 nm, respectively. Pigment concentrations were expressed on a surface area basis. Preliminary results revealed that chlorophyll a showed a downward trend due to the ozone treatment. Acid rain caused no effects on these three pigments, however, chlorophyll b showed an upward trend due to the interaction of ozone and acid rain. The carotenoid pigments showed no changes due to the treatments either singly, or in combination.

• OSTI ID: 5512278
• Report Number(s): CONF-9107184--
• Conference Information: Journal Name: Plant Physiology, Supplement; (United States) Journal Volume: 96:1
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
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54 ENVIRONMENTAL SCIENCES
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63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ACID RAIN
ATMOSPHERIC PRECIPITATIONS
BODY
CARBOXYLIC ACIDS
CAROTENOIDS
CHLOROPHYLL
CHRONIC EXPOSURE
CONIFERS
ENVIRONMENTAL IMPACTS
EXPOSURE CHAMBERS
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
LEAVES
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OZONE
PHYTOCHROMES
PIGMENTS
PINES
PINOPHYTA
PLANT TISSUES
PLANTS
PORPHYRINS
PROTEINS
RAIN
SPECTROPHOTOMETRY
TERPENES
TISSUES
TOXICITY
TREES