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

Shahla N. Sheikholeslam and Herbert B. Currier
Plant Physiology
Vol. 59, No. 3 (Mar., 1977), pp. 381-383
Stable URL: http://www.jstor.org/stable/4264742
Page Count: 3
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Effect of Water Stress on Turgor Differences and 14C-Assimilate Movement in Phloem of Ecballium elaterium
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Abstract

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.

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