Plant Physiol. Drug Metab Dispos
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Plant Physiology 59:381-383 (1977)
© 1977 American Society of Plant Biologists

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Articles

Effect of Water Stress on Turgor Differences and 14C-Assimilate Movement in Phloem of Ecballium elaterium1,2

Shahla N. Sheikholeslam and Herbert B. Currier

a Department of Botany, University of California, Davis, California 95616

The effects of water stress on pressure differences and 14C-assimilate translocation in sieve tubes of squirting cucumber Ecballium elaterium A. Rich were studied. Water stress was induced by transfer of plants from culture solution to a polyethylene glycol 6,000 solution having an osmotic potential of –18.2 atm. Sieve tube turgor, turgor differences between source and sink, and translocation rate were decreased. After 260 minutes of translocation, only 19% of the total fixed 14CO2 had moved out of the leaf, compared to the control value of 62% after the same period of time. The results suggest that water stress slows translocation by lowering sieve tube turgor differences, which are essential for the pressure flow mechanism of conduction.

1 This report is based largely on a portion of the thesis submitted by S. S. in partial fulfillment of the requirements for the Ph.D. degree in plant physiology, University of California, Davis.

2 Research supported in part by National Science Foundation Grant GB-19088 to H. B. C.






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Copyright © 1977 by the American Society of Plant Biologists