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Relating Stomatal Conductance to Leaf Functional Traits
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Direct Comparison of Leaf Plasmodesma Structure and Function in Relation to Phloem-Loading Type.

Johannes Liesche1,2, Chen Gao1,2, Piotr Binczycki3

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Plasmodesmata (PD) density alone does not define phloem-loading types. PD structure and function, not just density, are crucial for sugar transport in leaves, suggesting passive loading in some tree species.

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Area of Science:

  • Plant Biology
  • Plant Physiology
  • Cell Biology

Background:

  • Phloem loading, the transport of sugars from mesophyll to phloem, relies on plasmodesmata (PD).
  • Traditionally, PD density has been used to classify phloem-loading types, but quantitative data and structural considerations are often lacking.
  • Understanding PD structure and function is vital for accurate classification and comprehending sugar export mechanisms.

Purpose of the Study:

  • To quantitatively compare PD density, structure, and function across different cell-cell interfaces in nine plant species.
  • To evaluate the correlation between PD characteristics and intercellular diffusion capacity.
  • To determine the most reliable indicators of phloem-loading types and investigate the underlying transport mechanisms.

Main Methods:

  • Utilized transmission electron microscopy (TEM) to analyze PD density and structure.
  • Employed live-cell microscopy and fluorescence loss in photobleaching (FLIP) to measure intercellular diffusion capacity.
  • Compared data across nine species representing three principal phloem-loading types.

Main Results:

  • Relative PD density within a species, not absolute density, correlates with phloem-loading type.
  • PD density, diameter, and length did not correlate with measured intercellular diffusion capacity.
  • PD substructure, not visible in standard TEM, significantly influences permeability.

Conclusions:

  • Phloem-loading type classification requires considering PD structure and function alongside density.
  • A passive symplasmic loading mechanism is supported for several tree species (e.g., horse chestnut, birch, apple, poplar).
  • Further investigation into PD substructure is needed to fully understand its role in sugar transport.