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Effects of Ozone and Acidic Deposition on Carbon Allocation and Mycorrhizal Colonization of Pinus taeda L. Seedlings

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Patterns of carbon allocation and mycorrhizal colonization were examined in loblolly pine seedlings from two half-sib families exposed to three ozone treatments (charcoal-filtered air, ambient air + 80 ppb O3, and ambient air + 160 ppb O3) and three rain pH levels (5.2, 4.5, and 3.3) for 12 weeks in open-topped chambers in a field setting. No statistically significant effects of ozone or rain pH were detected on biomass, root:shoot ratios, or carbon allocation; some consistent patterns were observed, however. Coarse root starch concentrations and mycorrhizal infection varied significantly with ozone levels. No significant interactions of ozone, rain pH, or genotype were detected. For. Sci. 37(1):5-16.

Keywords: Starch; air pollution; rhizosphere

Document Type: Journal Article

Affiliations: Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN

Publication date: March 1, 1991

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