The Evidence for Symplastic Phloem Loading
- 1 June 1991
- journal article
- Published by Oxford University Press (OUP) in Plant Physiology
- Vol. 96 (2), 349-354
- https://doi.org/10.1104/pp.96.2.349
Abstract
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.Keywords
This publication has 13 references indexed in Scilit:
- Phloem Loading in Coleus blumei in the Absence of Carrier-Mediated Uptake of Export Sugar from the ApoplastPlant Physiology, 1990
- Symplastic Transfer of Fluorescent Dyes from Mesophyll to Sieve Tube in Stripped Leaf Tissue and Partly Isolated Minor Veins of Commelina benghalensisPlant Physiology, 1988
- Stachyose Synthesis in Source Leaf Tissues of the CAM Plant Xerosicyos danguyi H. Humb.Plant Physiology, 1988
- Different Patterns of Vein Loading of Exogenous [14C]Sucrose in Leaves of Pisum sativum and Coleus blumeiPlant Physiology, 1988
- Symplastic Transport in Ipomea tricolor Source LeavesPlant Physiology, 1986
- Release of Sucrose from Vicia faba L. Leaf DiscsPlant Physiology, 1983
- Sucrose and Glucose Uptake into Beta vulgaris Leaf TissuesPlant Physiology, 1982
- Phloem Loading in SquashPlant Physiology, 1977
- Compartmentation in Vicia faba LeavesPlant Physiology, 1975
- Role of Free Space in Translocation in Sugar BeetPlant Physiology, 1974