Effects of O3 and SO2 on leaf characteristics in soybeans grown under ambient- and enriched-carbon dioxide atmosphere

Bernardo F.T. Rudorff; Charles L. Mulchi; Edward H. Lee; Randy A. Rowland; Craig S. T. Daughtry

doi:10.1117/12.221087

21 September 1995 Effects of O₃ and SO₂ on leaf characteristics in soybeans grown under ambient- and enriched-carbon dioxide atmosphere

Bernardo F.T. Rudorff, Charles L. Mulchi, Edward H. Lee, Randy A. Rowland, Craig S. T. Daughtry

Author Affiliations +

Proceedings Volume 2503, Air Toxics and Water Monitoring; (1995) https://doi.org/10.1117/12.221087
Event: European Symposium on Optics for Environmental and Public Safety, 1995, Munich, Germany

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.

Citation Download Citation

Bernardo F.T. Rudorff, Charles L. Mulchi, Edward H. Lee, Randy A. Rowland, and Craig S. T. Daughtry "Effects of O₃ and SO₂ on leaf characteristics in soybeans grown under ambient- and enriched-carbon dioxide atmosphere", Proc. SPIE 2503, Air Toxics and Water Monitoring, (21 September 1995); https://doi.org/10.1117/12.221087

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