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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.

Water and Mineral Acquisition

Water and Mineral Acquisition

Specialized tissues in plant roots have evolved to capture water, minerals, and some ions from the soil. Roots exhibit a variety of branching patterns that facilitate this process. The outermost root cells have specialized structures called root hairs that increase the root surface, thus increasing soil contact. Water can passively cross into roots, as the concentration of water in the soil is higher than that of the root tissue. Minerals, in contrast, are actively transported into root cells.

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Short-distance transport refers to transport that occurs over a distance of just 2-3 cells, crossing the plasma membrane in the process. Small uncharged molecules, such as oxygen, carbon dioxide, and water, can diffuse across the plasma membrane on their own. In contrast, ions and larger molecules require the assistance of transport proteins due to their charge or size. Transport across membranes also occurs within individual cells, playing a variety of essential roles for the plant as a whole.

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Plant growth depends on its ability to take up water and dissolved minerals from the soil. The root system of every plant is equipped with the necessary tissues to facilitate the entry of water and solutes. The plant tissues involved in the transport of water and minerals have two major compartments - the apoplast and the symplast. The apoplast includes everything outside the plasma membrane of living cells and consists of cell walls, extracellular spaces, xylem, phloem, and tracheids. The...

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Plant morphogenesis—the development of a plant’s form and structure—involves several overlapping developmental processes, including growth and cell differentiation. Precursor cells differentiate into specific cell types, which are organized into the tissues and organ systems that make up the functional plant.

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Related Experiment Video

Updated: May 19, 2026

Lateral Root Inducible System in Arabidopsis and Maize

Lateral Root Inducible System in Arabidopsis and Maize

Published on: January 14, 2016

Phloem-mobile Aux/IAA transcripts target to the root tip and modify root architecture.

Michitaka Notaguchi¹, Shmuel Wolf, William J Lucas

¹Department of Plant Biology, College of Biological Sciences, University of California, Davis, CA 95616, USA.

Journal of Integrative Plant Biology

|August 29, 2012

Summary

Plant phloem sap transports signaling molecules. This study identifies specific indoleacetic acid (IAA) transcripts moving through the phloem, regulating root development and coordinating plant growth.

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Last Updated: May 19, 2026

Lateral Root Inducible System in Arabidopsis and Maize

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Published on: January 14, 2016

Shootward Movement of CFDA Tracer Loaded in the Bottom Sink Tissues of Arabidopsis

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Translating Ribosome Affinity Purification (TRAP) to Investigate Arabidopsis thaliana Root Development at a Cell Type-Specific Scale

Translating Ribosome Affinity Purification (TRAP) to Investigate Arabidopsis thaliana Root Development at a Cell Type-Specific Scale

Published on: May 14, 2020

Area of Science:

Plant Biology
Molecular Biology
Genetics

Background:

The plant phloem vascular system transports nutrients and signals.
Phloem sap contains proteins, mRNA, and small RNA, acting as potential long-distance signaling agents.
Understanding phloem mobility is crucial for elucidating whole-plant developmental coordination.

Purpose of the Study:

To develop a strategy for analyzing the function of phloem-mobile mRNA.
To investigate the role of indoleacetic acid (IAA) transcripts in plant development.
To identify specific IAA transcripts mobile in the phloem of Arabidopsis thaliana.

Main Methods:

Vasculature-enriched sampling and hetero-grafting techniques were employed.
Micro-grafting experiments confirmed transcript mobility and function.
Focus on IAA transcripts, known regulators of auxin signaling and development.

Main Results:

IAA18 and IAA28 were identified as phloem-mobile transcripts in Arabidopsis thaliana.
These transcripts are generated in mature leaf vascular tissues.
Transported IAA transcripts negatively regulate lateral root formation in the root system.

Conclusions:

Phloem-mobile Aux/IAA transcripts play a role in regulating root development.
A model is proposed where auxin distribution and phloem-mobile IAA transcripts dictate auxin action sites.
This highlights a novel mechanism for plant developmental coordination via long-distance signaling.