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Closing plant cell connections called plasmodesmata triggers stress responses and enhances resistance to certain pathogens. This finding reveals a new layer of plant immunity signaling.

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Area of Science:

  • Plant Biology
  • Molecular Plant Pathology
  • Plant Cell Communication

Background:

  • Plasmodesmata are crucial for intercellular transport in plants.
  • Plasmodesmal closure is observed during plant immune responses, but its functional role remains unclear.

Purpose of the Study:

  • To investigate the contribution of plasmodesmal closure to plant immunity.
  • To determine the signaling pathways activated by plasmodesmal closure.

Main Methods:

  • Development of transgenic plant lines to induce plasmodesmal closure.
  • Utilizing over-active CALLOSE SYNTHASE3 (iCALS3) and PDLP1 C-terminus for callose deposition.
  • Assessing gene expression, salicylic acid levels, and pathogen resistance.

Main Results:

  • Induced plasmodesmal closure enhanced stress-responsive gene expression and salicylic acid accumulation.
  • Plasmodesmal closure increased resistance to Pseudomonas syringae DC3000.
  • Homogeneous closure led to starch/sugar accumulation, reduced growth, and increased susceptibility to Botrytis cinerea.

Conclusions:

  • Plasmodesmal closure activates plant stress signaling pathways.
  • The findings raise questions about the signals mediating these responses and their context-dependency.