The Evidence for Symplastic Phloem Loading | Zendy

Robert Turgeon | Zendy; Dwight U. Beebe | Zendy

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The Evidence for Symplastic Phloem Loading

Author(s) -

Robert Turgeon,

Dwight U. Beebe

Publication year - 1991

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.96.2.349

Subject(s) - plasmodesma , phloem , raffinose , ultrastructure , chemistry , biophysics , sugar , biochemistry , botany , biology , sucrose

Experimental protocols used to study the route(s) of phloem loading in source leaves are evaluated; they include the analysis of plasmodesmatal ultrastructure and distribution, mobile compounds in the free space, loading patterns of exogenous sugars, the site of sugar synthesis, and dye coupling. All these methods have drawbacks. There are indications that some plants, especially those that translocate the raffinose series of sugars, load by a symplastic (through plasmodesmata) pathway, but the evidence is weak.

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