Effect of growth stage on soybean response to chronic ozone exposure. [Glycine max (L. )]

Journal Article · · Journal of Environmental Quality; (United States)

OSTI ID:5196451

Heagle, A S; Miller, J E; Rawlings, J O; Vozzo, S F ^[1]

---

1. North Carolina State Univ., Raleigh (USA)

Four cultivars of soybean (Glycine max (L.) Merr., cv. Forrest, Davis, Bragg, and Ransom) were exposed to chronic doses of O{sub 3} in open-top field chambers to determine if a relationship exists between growth stage and yield response to O{sub 3}. The season was divided into four 31-d quarters (Q1 - Q4) in which plants were exposed either to charcoal-filtered air (C) or to nonfiltered air with O{sub 3} added (N). Sixteen different quarterly sequences represented all possible combinations of the C and N treatments. The mean 31-d O{sub 3} concentration (7 h d{sup {minus}1} mean) in the N treatment was almost identical at 96 to 98 nL L{sup {minus}1} (ppb) for each quarter. In the sequence with N during all four quarters (NNNN), plants were exposed from emergence to physiological maturity. Mean yields in the NNNN treatment, expressed as a percentage of yield in the CCCC treatment ranged from 44% for Forrest (56% loss) to 70% for Bragg (30% LOSS). Ozone exposure during mid- to late-growth stages generally caused a greater yield decrease than exposure during early growth stages. Models to estimate O{sub 3} - yield relationships were developed separately for each cultivar using seasonal and quarterly O{sub 3} statistics. A statistical comparison for relative goodness-of-fit between these two models was not possible. However, the models based on the quarterly O{sub 3} values provided estimates with less absolute deviation from the observed data than models based on seasonal O{sub 3} values. Models based on quarterly O{sub 3} values generally confirmed that the relative effect of O{sub 3} during a given quarter was related to when the pod-fill stage occurred.

• OSTI ID: 5196451
• Journal Information: Journal of Environmental Quality; (United States), Journal Name: Journal of Environmental Quality; (United States) Vol. 20:3; ISSN JEVQA; ISSN 0047-2425
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540120 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
560300* -- Chemicals Metabolism & Toxicology
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
CHRONIC EXPOSURE
DOSE-RESPONSE RELATIONSHIPS
EXPOSURE CHAMBERS
GLYCINE HISPIDA
GROWTH
LEGUMINOSAE
MAGNOLIOPHYTA
MAGNOLIOPSIDA
MATHEMATICS
OZONE
PLANT GROWTH
PLANTS
PRODUCTIVITY
REGRESSION ANALYSIS
STATISTICS
TOXICITY