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Published in Crop Sci 17:329-335 (1977)
© 1977 Crop Science Society of America
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Effects of Irrigation History on Responses of Cotton to Subsequent Water Stress1

J. M. Cutler and D. W. Rains2

Experiments were designed to test the hypothesis that the internal water relations and stomatal and growth responses to water status of cotton plants (Gossypium hirsutum, ‘Acala SJ 2’) can be modified by prior tissue water deficits. Different levels of stress conditioning were achieved by varying irrigation frequency during a pretreatment period.

Growth was limited by water stress under conditions of low and moderate irrigation frequency during the pretreatment period. During the final drought period, tissue water desorption characteristics, stomatal closure thresholds, and (inferentially) turgor sensitivity were different in stress-conditioned plants from those in plants not subjected to prior stress. Analysis of the relationships of water potential to relative water content suggested that osmotic adjustment might play a role in the reduced sensitivity of hardened plants. The altered behaviors of prestressed plants were in the right direction to explain differences observed between the responses of controlled. environment and field-grown plants and suggest that stress-conditioned plants are less sensitive to tissue water deficits.

Key Words: Diffusion resistance • Leaf elongation • Leaf water potential • Growth • Dry weight partitioning • Hardening

1 Contribution from the Dep. of Agronomy and Range Science, Univ. of California, Davis, CA 95616, supported in part by a USDA grant (CSRS 316-15-36).

2 Graduate research assistant and associate professor, Dep. of Agronomy and Range Science, Univ. of California, Davis, CA 95616.

Received for publication June 22, 1976.




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