Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 58:537-540 (1976)
© 1976 American Society of Plant Biologists

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Articles

Water Potential and Stomatal Resistance of Sunflower and Soybean Subjected to Water Stress during Various Growth Stages 1

Nasser Sionit2 and Paul J. Kramer

a Department of Botany, Duke University, Durham, North Carolina 27706

Plants of two varieties of soybean (Glycine max (L.) Merr.) and two varieties of sunflower (Helianthus annuus L.) were grown in controlled environments and subjected to water stress at various stages of growth. Leaf resistances and leaf water potentials were measured as stress developed. In soybeans the upper leaf surface had a higher resistance than the lower surface at all leaf water potentials and growth stages. Resistance of the upper surface began to increase at a higher water potential and increased more than the resistance of the lower surface. Resistances returned to prestress values 4 days after rewatering. In sunflowers upper and lower leaf surfaces had similar resistances at all water potentials and growth stages. Leaf resistances were higher in sunflower plants stressed before flowering than in those stressed later. Sunflower plants stressed to –16 bars recovered their prestress leaf resistance and water potential a few days after rewatering, but leaves of sunflower plants stressed to –23 bars died. Leaves of soybean and sunflower plants stressed before flowering suffered less injury than those of older plants and sunflowers stressed after flowering suffered more injury than soybeans.

2 Present address: Irrigation Department, Pahlavi University, Shiraz, Iran.

1 This research was supported by National Science Foundation Grants BMS71-01193-A04 and AEN73-07893-A01 to P. J. K. and BMS71-00947-A02 to the Duke University unit of the Southeastern Plant Environment Laboratories.






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