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The Phragmoplast01:59

The Phragmoplast

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Cell division is essential for organismal growth and development. In animal cells, the central spindle and its associated proteins form the midbody, a structure that has an essential role in cytokinesis. In plants, the central spindle, along with the microtubules, actin, and other cell components, matures into the phragmoplast, which is necessary for cytokinesis. Unlike the stationary midbody, the phragmoplast expands centrifugally, eventually leading to the formation of the new cell wall.
The...
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Determining the Plane of Cell Division02:13

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Positioning the cell division plane is a critical step during development and cell differentiation, particularly during mitosis when the plane is essential for determining the size of the two daughter cells. The cell division plane is perpendicular to the plane of chromosome segregation, but different types of organisms have different cell division mechanisms to suit their morphology and function. 
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Distribution of Cytoplasmic Content02:33

Distribution of Cytoplasmic Content

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Cytokinesis segregates a cell’s chromosomes and organelles into its daughter cells. Organelles divide and grow prior to cell division but cannot be synthesized de novo; therefore, cells must receive at least one copy of each organelle to survive. Currently, many of the details of how the organelles are distributed are not yet fully elucidated.
Distribution of cytoplasmic determinants
The cytoplasm contains various organelles, as well as salts, proteins, and water. The distribution of...
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Binary Fission01:20

Binary Fission

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Fission is the division of a single entity into two or more parts, which regenerate into separate entities that resemble the original. Organisms in the Archaea and Bacteria domains reproduce using binary fission, in which a parent cell splits into two parts that can each grow to the size of the original parent cell. This asexual method of reproduction produces cells that are all genetically identical.
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Plasmodesmata02:32

Plasmodesmata

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The organs in a multicellular organism’s body are made up of tissues formed by cells. To work together cohesively, cells must communicate. One way that cells communicate is through direct contact with other cells. The points of contact that connect adjacent cells are called intercellular junctions.
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Mitosis and Cytokinesis01:35

Mitosis and Cytokinesis

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In eukaryotes, the cell division cycle is divided into distinct, coordinated cellular processes that include cell growth, DNA replication/chromosome duplication, chromosome distribution to daughter cells, and finally, cell division. The cell cycle is tightly regulated by its regulatory systems as well as extracellular signals that affect cell proliferation.
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Related Experiment Video

Updated: May 28, 2025

A Robotic Platform for High-throughput Protoplast Isolation and Transformation
10:12

A Robotic Platform for High-throughput Protoplast Isolation and Transformation

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Binary division of plastids involves endoplasmic reticulum mediation.

Puja Puspa Ghosh1, Thomas Kadanthottu Kunjumon1, Jaideep Mathur1

  • 1Laboratory of Plant Development and Interactions, Department of Molecular and Cellular Biology, University of Guelph, 50 Stone Road, Guelph, Ontario N1G2W1, Canada.

Journal of Experimental Botany
|February 13, 2025
PubMed
Summary
This summary is machine-generated.

The endoplasmic reticulum (ER) plays a crucial role in plastid division. ARC5 protein localization to the ER band constricts the plastid, enabling daughter plastid separation.

Keywords:
ARC5/DRP5Bendoplasmic reticulumfluorescent proteinsplastid division

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Area of Science:

  • Cell Biology
  • Plant Biology
  • Organelle Dynamics

Background:

  • Plastids divide via binary fission, a process involving the cytosolic protein ARC5.
  • The precise mechanisms of ARC5 recruitment and final plastid separation remain unclear.

Purpose of the Study:

  • To investigate the role of the endoplasmic reticulum (ER) in the late stages of plastid division.
  • To elucidate the involvement of ER in ARC5-mediated plastid constriction and separation.

Main Methods:

  • Time-lapse imaging of Arabidopsis thaliana.
  • Utilized stable transgenics expressing fluorescently tagged ER and ARC5 proteins.

Main Results:

  • ARC5 protein associates with ER membranes before mid-plastid localization.
  • ER band formation around the plastid mid-plane, driven by ARC5-ER association, constricts the plastid.
  • Membrane contact sites (MCSs) facilitate tandem plastid-ER dynamics, promoting rotation and separation of daughter plastids.

Conclusions:

  • The endoplasmic reticulum is pivotal in facilitating plastid division.
  • ER band constriction and ER-plastid dynamics are key mechanisms for plastid separation.