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Phloem and Sugar Transport

Phloem and Sugar Transport

Like many living organisms, plants have tissues that specialize in specific plant functions. For example, shoots are well adapted to rapid growth, while roots are structured to acquire resources efficiently. However, sugar production is primarily restricted to the photosynthetic cells that reside in the leaves of angiosperm plants. Sugar and other resources are transported from photosynthetic tissues to other specialized tissues by a process called translocation.

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Multispectral phloem-mobile probes: properties and applications.

Michael Knoblauch¹, Marc Vendrell¹, Erica de Leau¹

¹Plant Cell Biology Laboratory, School of Biology, Washington State University, Pullman, Washington 99164-4236 (M.K., T.R.-E.);University of Edinburgh/Medical Research Council Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, Edinburgh EH16 4TJ, United Kingdom (M.V.);Institute of Molecular Plant Sciences, University of Edinburgh, Edinburgh EH9 3BF, United Kingdom (E.d.L., A.P., K.K., K.O.); andPlant Biology Department, University of Minnesota, St. Paul, Minnesota 55108 (A.R., S.A.B., J.W.).

Plant Physiology

|February 6, 2015

Summary

This summary is machine-generated.

Researchers developed new fluorescent probes for studying plant phloem transport. These probes, including coumarin glucosides, can track nutrient movement in Arabidopsis thaliana, aiding in understanding plant vascular systems.

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Area of Science:

Plant Biology
Molecular Biology
Biochemistry

Background:

Phloem transport is crucial for distributing nutrients throughout plants.
Studying phloem transport requires reliable methods and tools, such as fluorescent probes.
Existing tools may have limitations in stability or specific transporter interactions.

Purpose of the Study:

To identify and characterize novel fluorescent probes for visualizing phloem transport in Arabidopsis thaliana.
To assess the suitability of these probes for studying phloem loading and unloading dynamics.
To evaluate the role of specific sucrose transporters in probe transport.

Main Methods:

Screening of small fluorescent probes for entry into the translocation stream and root tip unloading in Arabidopsis seedlings.
Utilizing oocytes to test the interaction of probes with sucrose transporters like AtSUC2 and HvSUT1.
Employing pulse-labeling studies with fluorescent probes to monitor phloem transport over time.
Comparing probe stability and utility in wild-type and genetically modified Arabidopsis lines.

Main Results:

A range of fluorescent probes with varying absorbance/emission maxima were identified.
Naturally occurring coumarin glucosides (esculin, fraxin) were phloem-loaded and transported via AtSUC2.
The barley sucrose transporter HvSUT1 did not transport esculin, demonstrating transporter specificity.
Esculin fluorescence decayed within 2 hours, suitable for pulse-labeling, while carboxytetraethylrhodamine offered longer stability.

Conclusions:

Developed a versatile toolbox of fluorescent probes for studying phloem transport in plants.
Demonstrated the role of AtSUC2 in phloem loading of esculin and the specificity of HvSUT1.
Identified probes suitable for different phloem transport study designs, including pulse-labeling and long-term observation.