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The Apoplast and Symplast01:46

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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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Apoplastic and vascular defences.

Martin Darino1, Kostya Kanyuka2, Kim E Hammond-Kosack1

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Essays in Biochemistry
|September 5, 2022
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Summary
This summary is machine-generated.

The apoplast, the space outside plant cell membranes, is crucial for plant immunity. It initiates pathogen recognition and employs various molecules and processes to defend against infections.

Keywords:
apoplastdefencesplant pathogenxylem

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Area of Science:

  • Plant Biology
  • Plant Pathology
  • Immunology

Background:

  • The apoplast is the extracellular space within plant tissues, including the xylem and extending to the plant surface.
  • It serves as a critical interface for plant-pathogen interactions.
  • The apoplast is increasingly recognized for its multifaceted role in plant defense mechanisms.

Purpose of the Study:

  • To review recent findings on the apoplast's role in plant immunity.
  • To highlight the molecular and cellular mechanisms involved in apoplastic defense.
  • To identify knowledge gaps in understanding apoplast-pathogen interactions.

Main Methods:

  • Literature review of current research on apoplast function in plant immunity.
  • Analysis of molecular signaling pathways and defense responses initiated in the apoplast.
  • Examination of nutrient dynamics and their role in apoplastic defense.

Main Results:

  • The apoplast is a primary site for pathogen recognition and the initiation of plant immune responses.
  • Apoplastic defense involves the secretion of diverse molecules (proteases, immune proteins, small RNAs, metabolites) and reactive oxygen species (ROS).
  • Sugar availability in the apoplast is a key factor, with plants and pathogens competing for nutrients.

Conclusions:

  • The apoplast is a dynamic compartment essential for plant immunity against pathogens.
  • Understanding apoplastic defense strategies offers potential for developing novel disease resistance methods.
  • Further research is needed to fully elucidate the complex interactions within the apoplast during plant-pathogen encounters.