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Genotypic Responses in Sorghum to Drought Stress. II. Leaf Tissue Water Relations¹

The sigmoid relationship between leaf water saturation deficit (WSD) and leaf water potential, as a measure of dehydration avoidance, was investigated in 10 sorghum (Sorghum bicolor L. Moench.) genotypes grown in the field in 1971 and 1972. The leaf water potential at which an exponential increase in WSD commenced appeared to vary among genotypes, ranging from about _*10 to _*12 bars in Feterita and RS-610 to _*16 bars in Hegari. When genotypes were ranked according to mean increase in WSD per unit decrease in leaf water potential, the greatest dehydration avoidance was observed in Hegari and the Kafirs, and the least in RS-610 hybrid and Feterita.

Key Words: Sorghum bicolor (L.) Moench. • Drought resistance • Dehydration avoidance • Leaf water potential • Water saturation deficit

² Research Agronomist, Division of Field Crops. The assistance of Mrs. B. Sanmena is gratefully acknowledged.

Received for publication January 30, 1974.