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Vesicles Are Persistent Features of Different Plastids.

Emelie Lindquist1, Katalin Solymosi2, Henrik Aronsson3

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Peripheral vesicles are active in all plastid types, not just developing chloroplasts. This protein-mediated transport system is crucial for plastid function across various plant tissues and developmental stages.

Keywords:
chloroplastperipheral reticulumplastidthylakoid developmentvesicle

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Area of Science:

  • Plant Biology
  • Cell Biology
  • Biochemistry

Background:

  • Peripheral vesicles in plastids are primarily observed in proplastids and developing chloroplasts, where they are thought to aid thylakoid biogenesis.
  • Previous studies on vesicles in mature chloroplasts often involved specific treatments like low temperatures or fusion inhibitors.
  • The role of protein-mediated vesicle transport in chloroplasts has only recently gained attention, with similarities noted to cytosolic coat protein complex II systems.

Purpose of the Study:

  • To investigate the presence and nature of vesicle-like structures in various plastid types beyond developing chloroplasts.
  • To determine if vesicle transport occurs in mature plastids under normal conditions, across different plant species, cell types, and organs.
  • To evaluate the role of protein-mediated transport in plastid vesicles.

Main Methods:

  • Microscopic observation of vesicle-like structures in diverse plastid types (proplastids, chloroplasts, etioplasts, leucoplasts, chromoplasts, desiccoplasts).
  • Examination across C3 and C4 plant species, various cell types (meristematic, epidermal, mesophyll, bundle sheath, secretory), and different organs (roots, stems, leaves, floral parts, fruits).
  • Analysis of recent data suggesting similarities between plastid vesicle systems and cytosolic coat protein complex II.

Main Results:

  • Vesicle-like structures were observed in all examined plastid types, including mature chloroplasts, etioplasts, leucoplasts, chromoplasts, and desiccoplasts, without specific pretreatments.
  • These structures were found across C3 and C4 species, diverse cell types, and various plant organs.
  • Evidence supports an active, protein-mediated vesicle transport system operating in all plastids, irrespective of developmental stage, temperature, or chemical treatments.

Conclusions:

  • Peripheral vesicles and active vesicle transport are not limited to developing chloroplasts but are a general feature of all plastid types.
  • This protein-mediated vesicle transport system is integral to plastid function throughout plant development and across different tissues and organs.
  • The findings challenge previous notions and highlight a fundamental, conserved mechanism in plant cell biology.