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Salinity-Ozone Interactive Effects on Yield and Water Relations of Pinto Bean¹

ABSTRACT

The interaction of salinity and ozone on the growth of pinto bean (Phaseolus vulgaris L.) was evaluated in a controlled temperature light room. Salinity treatments having osmotic potentials of –0.4, –2.0, and –4.0 bars were studied in combination with 2-hour daily exposures to 0, 0.15, 0.25, and 0.35 ppm of ozone.

Ozone at 0.15 ppm decreased the yield of nonsaline plants nearly 50%; and at 0.25 ppm and higher, no significant yield was obtained. The results were essentially the same for plants salinized to –2.0 bars. At –4.0 bars, the yield at 0.25 ppm was only reduced to half that of the ozone-free treatment. The results indicate no interaction between salinity and ozone below 0.15 ppm. Above 0.15 ppm, however, there is a large interaction. At salinities of –0.4 and –2.0 bars, water-use efficiency decreased as ozone increased. Ozone did not appear to influence leaf water potential or its components.

Key Words: leaf water potential • stomatal resistance • transpiration • water-use efficiency

¹ Contribution from the U. S. Salinity Laboratory, ARS, USDA, P. O. Box 672, Riverside, Calif. 92502.

² Agricultural Engineer, Plant Physiologist, and Supervisory Soil Scientist, respectively.