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Leaf Conductance and Leaf Water Status of Sesame Strains in Hot, Dry Climates¹

Leaf conductance to water vapor loss was examined as a potential physiological index of yield potential in hot, dry climates. Differences in leaf conductance were observed between some strains of Sesamum indicum L. that were consistent from day to day, in irrigated field environments. Generally, plants with dehiscent capsules had higher leaf conductances and more negative xylem pressure potentials than non-dehiscent plants. These larger leaf water deficits were probably caused by faster transpiration rates that would result from higher leaf conductances in hot, dry weather.

Key Words: Stomata • Xylem pressure potential • Physiological indices • Dehiscence • Sesamum indicum L.

² Assistant professor and professor, Univ. of California, Riverside, CA 92502.

Received for publication April 23, 1975.