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Ex vivo Mechanical Loading of Tendon
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Mechanisms of phloem loading.

Cankui Zhang1, Robert Turgeon2

  • 1Department of Agronomy and Purdue Center for Plant Biology, Purdue University, West Lafayette, IN 49707, USA.

Current Opinion in Plant Biology
|February 16, 2018
PubMed
Summary

Plant nutrient transport relies on phloem loading, the process of moving sugars and amino acids. SWEET proteins and plasmodesmata are key to phloem loading, ensuring plant growth.

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Area of Science:

  • Plant Biology
  • Molecular Transport
  • Biochemistry

Background:

  • Higher plants require continuous nutrient transport via the phloem.
  • Phloem loading is the critical first step, moving sugars and amino acids from source cells to sieve tubes.
  • Understanding phloem loading mechanisms is vital for plant physiology and growth.

Purpose of the Study:

  • To elucidate the mechanisms of phloem loading in higher plants.
  • To highlight the role of SWEET proteins in apoplastic phloem loading.
  • To review models of polymer trapping and diffusion mechanisms via plasmodesmata.

Main Methods:

  • Literature review of current phloem loading models.
  • Analysis of the role of SWEET transporters in sucrose efflux.
  • Examination of plasmodesmatal transport pathways.

Main Results:

  • Identified SWEET proteins as key mediators of the initial sucrose release in apoplastic phloem loading.
  • Confirmed plasmodesmata as crucial for polymer trapping and diffusion mechanisms.
  • Recent models provide insights into the efficiency of these loading processes.

Conclusions:

  • Phloem loading is a complex process involving distinct mechanisms.
  • SWEET proteins play a significant role in nutrient translocation.
  • These mechanisms collectively support the growth of plants, including large trees.