| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
a USDA-ARS Air Quality–Plant Growth and Development Research Unit, 3908 Inwood Road, Raleigh, NC 27603
b Dep. of Plant Pathology, North Carolina State Univ., Raleigh, NC 27695
c Dep. of Crop Science, North Carolina State Univ., Raleigh, NC 27695
* Corresponding author (asheagle{at}unity.ncsu.edu)
Received for publication January 17, 2002. Elevated CO2 concentrations expected in the 21st century can stimulate plant growth and yield, whereas tropospheric O3 suppresses plant growth and yield in many areas of the world. Recent experiments showed that elevated CO2 often protects plants from O3 stress, but this has not been tested for many important crop species including snap bean (Phaseolus vulgaris L.). The objective of this study was to determine if elevated CO2 protects snap bean from O3 stress. An O3–tolerant cultivar (Tenderette) and an O3–sensitive selection (S156) were exposed from shortly after emergence to maturity to mixtures of CO2 and O3 in open-top field chambers. The two CO2 treatments were ambient and ambient with CO2 added for 24 h d-1 resulting in seasonal 12 h d-1 (0800–2000 h EST) mean concentrations of 366 and 697 µL L-1, respectively. The two O3 treatments were charcoal-filtered air and nonfiltered air with O3 added for 12 h d-1 to achieve seasonal 12 h d-1 (0800–2000 h EST) mean concentrations of 23 and 72 nL L-1, respectively. Elevated CO2 significantly stimulated growth and pod weight of Tenderette and S156, whereas elevated O3 significantly suppressed growth and pod weight of S156 but not of Tenderette. The suppressive effect of elevated O3 on pod dry weight of S156 was approximately 75% at ambient CO2 and approximately 60% at elevated CO2 (harvests combined). This amount of protection from O3 stress afforded by elevated CO2 was much less than reported for other crop species. Extreme sensitivity to O3 may be the reason elevated CO2 failed to significantly protect S156 from O3 stress.
Abbreviations: CF, open-top field chamber receiving charcoal-filtered air • Cg, cultigen, cultivar, or selection of snap bean • NCER, net carbon exchange rate • OZ, open-top field chamber receiving nonfiltered air with O3 added for 12 h d-1 • SC, stomatal conductance
This article has been cited by other articles:
|
|
 |
|
  F. L. Booker, K. O. Burkey, W. A. Pursley, and A. S. Heagle Elevated Carbon Dioxide and Ozone Effects on Peanut: I. Gas-Exchange, Biomass, and Leaf Chemistry Crop Sci., July 30, 2007; 47(4): 1475 - 1487. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
K. O. Burkey, F. L. Booker, W. A. Pursley, and A. S. Heagle Elevated Carbon Dioxide and Ozone Effects on Peanut: II. Seed Yield and Quality Crop Sci., July 30, 2007; 47(4): 1488 - 1497. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 F. L. Booker and E. L. Fiscus The role of ozone flux and antioxidants in the suppression of ozone injury by elevated CO2 in soybean J. Exp. Bot., August 1, 2005; 56(418): 2139 - 2151. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 K. O. Burkey, J. E. Miller, and E. L. Fiscus Assessment of Ambient Ozone Effects on Vegetation Using Snap Bean as a Bioindicator Species J. Environ. Qual., May 11, 2005; 34(3): 1081 - 1086. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
A. S. Heagle, J. E. Miller, and W. A. Pursley Growth and Yield Responses of Potato to Mixtures of Carbon Dioxide and Ozone J. Environ. Qual., September 1, 2003; 32(5): 1603 - 1610. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
| The SCI Journals | Agronomy Journal | Crop Science | |||
| Vadose Zone Journal | Journal of Plant Registrations | ||||
| Journal of Natural Resources and Life Sciences Education |
Soil Science Society of America Journal |
