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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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Updated: Aug 1, 2025

Phloem Sap Sampling from Brassica napus for 3D-PAGE of Protein and Ribonucleoprotein Complexes

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Published on: January 9, 2018

Phloem Sap Composition: What Have We Learnt from Metabolomics?

Louis Broussard¹, Cyril Abadie¹, Julie Lalande¹

¹Institut de Recherche en Horticulture et Semences, Université d'Angers, INRAe, 42 rue Georges Morel, 49070 Beaucouzé, France.

International Journal of Molecular Sciences

|April 28, 2023

Summary

Phloem sap analysis reveals a diverse metabolome beyond sugars and amino acids, highlighting its crucial role in nutrient transport and plant development. This research deepens our understanding of metabolite exchange between plant organs.

Keywords:

metabolic cycle metabolome phloem sampling sap

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Area of Science:

Plant Biology
Plant Physiology
Biochemistry

Background:

Phloem sap transport is vital for redistributing nutrients, metabolites, and signaling molecules, essential for plant nutrition and development.
Understanding phloem sap's biochemical composition is challenging due to difficulties in sampling and extensive chemical analysis.
Metabolomics approaches, including liquid and gas chromatography coupled with mass spectrometry, are increasingly used to analyze phloem sap.

Purpose of the Study:

To provide an overview of the current knowledge of the phloem sap metabolome.
To understand how metabolites are exchanged between plant organs.
To elucidate the impact of metabolite allocation on plant growth and development.

Main Methods:

Review of existing metabolomics analyses of phloem sap.
Utilizing liquid chromatography-mass spectrometry (LC-MS) and gas chromatography-mass spectrometry (GC-MS) data.
Analysis of physiological information derived from phloem sap metabolomics.

Main Results:

Phloem sap contains a wide array of metabolites, extending beyond simple sugars and amino acids, representing numerous metabolic pathways.
Metabolite exchange between source and sink organs is a common phenomenon.
Evidence suggests the existence of metabolic cycles at the whole-plant scale.

Conclusions:

Phloem sap metabolomics offers valuable insights into plant physiology and whole-plant metabolic coordination.
Metabolite exchange facilitates metabolic interdependence between plant organs.
Understanding these processes is key to comprehending shoot-root coordination and overall plant growth and development.