Among clone comparison of the response of photosynthetic pigments in mature branches of Pinus ponderosa to long-term exposure of ozone and acid rain

Conference · Tue May 01 04:00:00 EDT 1990 · Plant Physiology, Supplement; (USA)

OSTI ID:5858431

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

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1. California State Univ., Chico (USA)
2. Lawrence Livermore National Laboratory, CA (USA)

Three clone families of mature grafted scions are to be exposed to ambient, charcoal filtered, and ozone-enriched air both separately and in conjunction with two concentrations of acid precipitation (3.0 pH, 5.1 pH) using branch exposure chambers (BECs). A total of 72 branches are being studied from 18 trees. Ambient ozone will be continuously monitored and the elevated ozone treatment will double this value (2x ambient). Acid rain events will occur weekly from February through May to provide total precipitation amounts similar to the annual rainfall occurring in the central Sierra-Nevada of California. Needle samples were analyzed spectrophotometrically to determine the absorbance of chlorophyll a and b and carotenoids at 662 nm, 645 nm, and 470 nm, respectively. Pigment concentrations were calculated for surface area (mg/cm{sup 2}) and compared among individuals and among clones. Pre-exposure concentrations of chlorophyll a and carotenoids were found to differ significantly (=0.05) among clones.

• OSTI ID: 5858431
• Report Number(s): CONF-9007196--
• Conference Information: Journal Name: Plant Physiology, Supplement; (USA) Journal Volume: 93:1
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540110*
550200 -- Biochemistry
59 BASIC BIOLOGICAL SCIENCES
ACID RAIN
ATMOSPHERIC PRECIPITATIONS
BIOLOGICAL EFFECTS
CALIFORNIA
CONIFERS
DATA
EXPERIMENTAL DATA
FEDERAL REGION IX
INFORMATION
NORTH AMERICA
NUMERICAL DATA
OZONE
PIGMENTS
PINES
PINOPHYTA
PLANTS
RAIN
TREES
USA