Why are centrosomes absent in plant cells?

By Ritesh|Updated : September 2nd, 2022

Fungi and plants do not have centrosomes and use MTOC structures to coordinate their microtubules. Plant cells do not possess centrioles or spindle bodies except for the flagellated male gametes, which are entirely available in flowering plants (conifers). The nuclear envelope takes over the primary function of the MTOC for microtubule nucleation and spindle organization during plant cell mitosis.

Reasons Why Centrosomes are Absent in Plant Cells

  • Higher plants have evolved a different pathway to regulate cytoskeleton assembly and dynamics.
  • Although plant and animal cells share major cytoskeletal elements which imply directed work, plants do not have centrosome-like organelles.
  • However, they are still capable of building spindles and have therefore developed preprophase band, cortical array, and phragmoplast that participate in essential growth processes.
  • A few elements, like gamma-tubulin, play an important role in the nucleation of microtubules on the nucleus surface.

Summary:

Why are centrosomes absent in plant cells?

Plants do not have centrosomes and use MTOC structures to coordinate their microtubules. Microtubules are nucleated at organization and nucleation centres in other eukaryotes committed to establishing polarity.

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