Abstract
This study was conducted to determine the physiological and growth responses of cotton ( Gossypium hirsutum L.) to the interaction of ozonee (O 3) and drought stress. Cotton (cv SJ-2) was grown in open-top chambers in the field at three levels of soil water and exposed to charcoal-filtered air (CF), nonfiltered air (NF), and NF × 1·25, and NF × 1·5 ambient O 3 concentrations in Riverside, CA, from June to October 1986. Ozone reduced carbon fixation an average of 74·6% in optimally watered (OW) plots, 63·4% in suboptimal (SO) plots, but only 19·3% in severely water-stressed (SS) plots. Leaf and stem biomass in OW and SO plots showed similar linear reductions in mass response to increased O 3 concentrations, but SS plots showed no response to O 3 except at the highest O 3 treatment (seasonal 12-h O 3 mean of 0·111 ppm 218 μm −3). These results showed that moderately water-stressed cotton had similar physiological and growth responses to O 3 as well-watered plants, but severely water-stressed cotton showed little response to O 3 at ambient O 3 concentrations.
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