HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Heagle, A. S. Articles by Booker, F. L. Search for Related Content PubMed Articles by Heagle, A. S. Articles by Booker, F. L. Agricola Articles by Heagle, A. S. Articles by Booker, F. L.

Influence of Ozone Stress on Soybean Response to Carbon Dioxide Enrichment: I. Foliar Properties

USDA-ARS, Air Quality - Plant Growth and Development Research Unit, 1509 Varsity Drive, Raleigh, NC 27606 and Dep. of Plant Pathology, North Carolina State Univ.
USDA-ARS, Air Quality - Plant Growth and Development Research Unit, 1509 Varsity Drive, Raleigh, NC 27606 and Dep. of Crop Science, North Carolina State Univ.
Air Quality Research Unit, 1509 Varsity Drive, Raleigh, NC 2706, and Dep. of Crop Science, North Carolina State Univ.

^* Corresponding author (Email: asheagle{at}unity.ncsu.edu).

Tropospheric O₃ can cause foliar injury, decreased growth, and decreased yield, whereas CO₂ enrichment generally causes opposite effects. Little is known about plant response to mixtures of O₃ and CO₂. Open-top field chambers were used to determine if foliar responses of soybean [Glycine max (L.) Merr.] to CO₂ enrichment are affected by O₃ stress and vice versa. Plants were grown in 14-L pots and exposed to four CO₂ and three O₃ concentrations in 12 combinations. The CO₂ treatments were ambient (366 µL^–) and three treatments with CO₂ added for 24 h d 1 at approximately 1.3, 1.6, and 2.0 times ambient. The O₃ treatments were charcoal-filtered air (CF), nonfiltered air (NF), and NF with O₃ added for 12 h^–1 ( NF+), resulting in seasonal concentrations of approximately 20, 46, and 75 µL L^–1. Foliar effects of CO₂ enrichment were dependent on the amount of stress caused by O₃. In the CF treatment, plants were not stressed by O₃, and CO₂ enrichment caused chlorosis and decreased chlorophyll. In the NF and NF+ treatments, plants were stressed by 03, and CO₂ enrichment suppressed chlorosis and increased chlorophyll. Ozone decreased specific leaf weight, increased foliar N and C, and decreased C/N ratios, whereas CO₂ caused opposite responses for these measures. Ozone increased foliar S and B but did not affect P or K concentrations. Conversely, CO₂ enrichment suppressed foliar S, B, P, and K concentrations. These interactions between O₃ and CO₂ emphasize a need to consider the amount of plant stress caused by O₃ in studies to measure effects of CO₂ enrichment.

Received for publication December 16, 1996.

This article has been cited by other articles:

				P. K. E. Campbell, E. M. Middleton, J. E. McMurtrey, L. A. Corp, and E. W. Chappelle Assessment of Vegetation Stress Using Reflectance or Fluorescence Measurements J. Environ. Qual., May 7, 2007; 36(3): 832 - 845. [Abstract] [Full Text] [PDF]

				F. L. Booker, J. E. Miller, E. L. Fiscus, W. A. Pursley, and L. A. Stefanski Comparative Responses of Container- versus Ground-Grown Soybean to Elevated Carbon Dioxide and Ozone Crop Sci., March 28, 2005; 45(3): 883 - 895. [Abstract] [Full Text] [PDF]