Phloem Pressure Differences and 14C-Assimilate Translocation in Ecballium elaterium | Zendy

Shahla N. Sheikholeslam | Zendy; H. B. Currier | Zendy

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Phloem Pressure Differences and ¹⁴C-Assimilate Translocation in Ecballium elaterium

Author(s) -

Shahla N. Sheikholeslam,

H. B. Currier

Publication year - 1977

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.59.3.376

Subject(s) - phloem , sieve tube element , turgor pressure , chromosomal translocation , shoot , botany , biology , horticulture , chemistry , biochemistry , gene

The role of phloem turgor pressure in (14)C-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 (14)CO(2) and treated regions.

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