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Growth, Photosynthesis, and Chlorophyll Concentrations of Red Spruce Seedlings Treated with Mist Containing Hydrogen Peroxide¹

Environmental Sciences Division, Oak Ridge Natl. Lab., Building 1506, P.O. Box 2008, Oak Ridge, TN 37831-6034.

^* Corresponding author.

ABSTRACT

The effects of controlled exposures of mist (50–90 µm drop size) containing hydrogen peroxide (H₂O₂) on greenhouse-grown red spruce (Picea rubens Sarg.) were studied for 16 wk coincident with the 1987 growing season. One-year-old seedlings were treated with simulated mist containing 0, 15, 59, or 235 µM H₂O₂ three times each week from 2400 to 0930 h. Height, diameter, net photosynthesis, respiration, chlorophyll, and dry weight measurements were made. After 16 wk of H₂O₂ exposures, no visible symptoms of foliar injury were evident. Similarly, no differences in net photosynthesis, respiration, or needle pigment concentrations were observed. Analysis of covariance of the dry weight data showed significantly greater dry matter in seedlings exposed to 235 µM H₂O₂ treatment vs. those treatments representing a range of ambient conditions (0, 15, and 59 µM). Mean relative growth rates were also the greatest for seedlings of the 235 µM treatment. Given these controlled exposure studies, it is hypothesized that concentrations of wet-deposited H₂O₂ of up to twice current ambient maximums are unlikely to reduce red spruce seedling growth through direct impairment of leaf function.

¹ The submitted manuscript has been authored by a contractor of the U.S. Government under Contract no. DE-AC05-84OR 1400. Accordingly, the U.S. Government retains a nonexclusive, royalty-free license to publish or reproduce the published form of this contribution, or allow others to do so, for U.S. Government purposes.

Research sponsored by the USDA, Spruce-Fir Res. Cooperative Program under Interagency Agreement 1594-1594-A1 with the U.S. Dep. of Energy under Contract DE-AC05-840R21400 with Martin Marietta Energy Systems, Inc.

The senior author was also supported by Oak Ridge Associated Universities and Automated Sciences Group, Inc. Publication no. 3320, Environmental Sciences Division, Oak Ridge Natl. Lab.

Received for publication February 16, 1989.