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WATER RELATIONS OF DIFFERENTIALLY IRRIGATED COTTON EXPOSED TO OZONE
Citation:
Temple, P. WATER RELATIONS OF DIFFERENTIALLY IRRIGATED COTTON EXPOSED TO OZONE. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-90/469.
Description:
This field study was conducted to test the hypothesis that plants chronically exposed to be sore susceptible to drought because typically inhibits root growth and increases shoot-root ratios implants. otton was grown in open-top chambers on Hanford coarse sandy loam in Riverside, CA. lants are grown under three irrigation regimes: optimum water for lint production (OW), suboptimum or moderate drought stress (SO), and severely drought stressed (SS) and are exposed to seasonal 12 h (0800-2000) O3 concentrations of 0.015, 0.074, 0.094, or 0.111 uLL. eaf xylem pressure potentials (+1) and soil water content (Ov) were measured weekly from June to October. ean seasonal increased from -1.89 MPa to -1.72 MPa in low to high O3 treatments, averaged across soil water regimes. zone had no effect on seasonal water use of cotton, but water use efficiency as significantly reduced by in and SO, but not in SS treatments. rought-stressed plants extracted proportionally greater amounts of water from deeper in the soil profile than OW cotton, and had no apparent effect on this redistribution of roots in the soil. ince had no apparent effect on the ability drought-stressed cotton to maintain and to increase root growth relative to root growth, this suggests that O3 may have little or no effect on the potential of cotton to adapt to or tolerate drought.