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Proceedings Paper

Effects of O3 and SO2 on leaf characteristics in soybeans grown under ambient- and enriched-carbon dioxide atmosphere
Author(s): Bernardo F.T. Rudorff; Charles L. Mulchi; Edward H. Lee; Randy A. Rowland; Craig S. T. Daughtry
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Paper Abstract

The effects of two air pollutant gases (SO2 and O3) on leaf photosynthesis (PS), leaf chlorophyll (Chl), chlorophyll fluorescence transients (CFTs), leaf reflectance (LR) and canopy reflectance (CR) in soybeans (Glycine max L. Merr.) were studied under both ambient- and elevated-atmospheric (CO2) using open-top chambers. In the CO2 vs. O3 experiment, soybeans 'Clark' were exposed to charcoal filtered air (low-O3) or ambient air + 40 nL L-1(O3) (high O3) during 7 h day-1, 5 days week-1 having (CO2) of 350 (mu) L L-1 CO2 (ambient-CO2) or 500 (mu) L L-1 (enriched-CO2) for 12 h day-1. In the CO2 vs. SO2 experiment, soybeans 'Essex' were exposed to charcoal filtered air (low-SO2) or + 120 nL L-1 SO2 (high-SO2) during 5 hr day-1, 5 days week-1 having the same (CO2) as for the CO2 vs. O3 experiment. Plants were exposed to treatment gases from early growth until maturity. In the CO2 vs. O3 experiment, leaf PS, leaf Chl, and CR showed trends of reduced values under high-O3, while LR was largely unchanged. Leaf PS and CR had increased values under enriched CO2. Leaf Chl and LR were not affected by CO2 enrichment. In the CO2 vs. SO2 experiment, CFTs values indicated that the gases has no impact on the light reactions of photosynthesis. Reduction in leaf PS, leaf Chl, and CR were observed under high-SO2 while LR was unchanged. The enriched CO2 environment increased leaf PS rates but had no effect on LR and leaf Chl.

Paper Details

Date Published: 21 September 1995
PDF: 12 pages
Proc. SPIE 2503, Air Toxics and Water Monitoring, (21 September 1995); doi: 10.1117/12.221087
Show Author Affiliations
Bernardo F.T. Rudorff, National Institute for Space Research (Brazil)
Charles L. Mulchi, Univ. of Maryland/College Park (United States)
Edward H. Lee, U.S. Dept. of Agriculture (United States)
Randy A. Rowland, U.S. Dept. of Agriculture (United States)
Craig S. T. Daughtry, U.S. Dept. of Agriculture (United States)


Published in SPIE Proceedings Vol. 2503:
Air Toxics and Water Monitoring
George M. Russwurm, Editor(s)

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