Plant Physiol.
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Plant Physiology 96:116-120 (1991)
© 1991 American Society of Plant Biologists

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Environmental and Stress Physiology

Antitranspirant-Induced Increases in Leaf Water Potential Increase Tuber Calcium and Decrease Tuber Necrosis in Water-Stressed Potato Plants 1

Kyaw Win2, Gerald A. Berkowitz and Melvin Henninger

Horticulture Department, Cook College, Rutgers—The State University of New Jersey, New Brunswick, New Jersey 08903

Experiments were undertaken with field-grown potato (Solanum tuberosum L.) plants to test the hypothesis that altering leaf:tuber water potential gradients within a plant subjected to low soil moisture will allow greater Ca accumulation in tubers and reverse Ca deficiency-related tuber necrosis. Antitranspirant formulations containing a wax emulsion and a spreader/sticker surfactant increased leaf water potential during a drought episode, significantly reducing the potential gradient that develops between leaf and tuber during a period of stress. Increased leaf water potential in treated plants was associated with decreased leaf Ca and increased tuber Ca. Tuber necrosis was found to be reduced in treated plants, thus increasing tuber quality.

2 Present address: Myanmar Agriculture Service, Pindaya, Shan State, Myanmar, Burma.

1 New Jersey Agricultural Experiment Station, publication No. 12149-14-90.






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ASPB Publications PLANT PHYSIOLOGY THE PLANT CELL
Copyright © 1991 by the American Society of Plant Biologists