Effects of EDU and Ozoban on the response of shortleaf pine to ozone

Conference · Wed Jun 01 04:00:00 EDT 1994 · Bulletin of the Ecological Society of America; (United States)

OSTI ID:7272200

Elsik, C G; Flagler, R B ^[1]

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1. Texas A M Univ., College Station, TX (United States)

Two greenhouse studies were undertaken to determine the effects of ethylenediurea (EDU) and sodium erythorbate (Ozoban), on the response of shortleaf pine to ozone (O[sub 3]). Seedlings of two half-sib families of shortleaf pine, S2PE3, and S3PE9, and a third [open quotes]woods-run[close quote] selection were exposed to four levels of O[sub 3] in continuous-stirred tank reactor chambers. Ozone was dispensed at the levels of 0, 50, 100, and 200 ppm for 7 day[sup [minus]1] for 12 weeks. For the EDU study, the chemical treatment levels were 0, 150, 300, and 450 ppm EDU. For the Ozoban study, the chemical treatment levels were 0 and 1030 pp m Ozoban. Ozone levels greater than 0 consistently resulted in foliar injury and decreased net photosynthesis. In the EDU study, all three selections exhibited linear decreases in leaf area and in foliage, stem in leaf area and in the biomass components. There were no seedling responses to Ozoban alone, but necrotic lesions that were not caused by O[sub 3] appeared on EDU-treated plants in each selection. There were no EDU [times] O[sub 3] interactions. Regression analysis revealed an Ozoban x O[sub 3] interaction on leaf area and total, stem, and foliage biomass of the woods-run selection, the most O[sub 3]-sensitive selection. Ozobon provided increasing protection as O[sub 3] concentration increased.

• OSTI ID: 7272200
• Report Number(s): CONF-940894--
• Conference Information: Journal Name: Bulletin of the Ecological Society of America; (United States) Journal Volume: 75:2
• Country of Publication: United States
• Language: English

Related Subjects

560300* -- Chemicals Metabolism & Toxicology
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
BIOLOGICAL EFFECTS
CONIFERS
EXPOSURE CHAMBERS
GROWTH
OZONE
PINES
PINOPHYTA
PLANT GROWTH
PLANTS
RESPONSE MODIFYING FACTORS
TREES