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Plant Physiology 59:376-380 (1977)
© 1977 American Society of Plant Biologists

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Phloem Pressure Differences and 14C-Assimilate Translocation in Ecballium elaterium1,2

Shahla N. Sheikholeslam and Herbert B. Currier

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

The role of phloem turgor pressure in 14C-assimilate translocation in Ecballium elaterium A. Rich was studied. The direction of translocation was manipulated by two methods: darkening, or defoliation, of the upper or lower halves of the shoots. After 24 hours of labeled assimilate movement, sieve tube turgor levels were measured with the phloem needle technique. Distribution of label, determined by autoradiography and counting, revealed a direct correlation between the direction of assimilate transport and the pressure difference. Phloem turgor levels always decreased in the stem of darkened shoots; this resulted in greater pressure differences in the stem between the source leaf receiving 14CO2 and treated regions.

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