Why are Centrosomes Absent in Plant Cells?

By BYJU'S Exam Prep

Updated on: November 9th, 2023

Fungi and plants do not have centrosomes and use MTOC structures to coordinate their microtubules. All plant cells lack centrioles and spindle bodies, with the exception of the flagellated male gametes, which are present in all flowering plants (conifers). During plant cell mitosis, the nuclear envelope takes over the MTOC’s primary role in microtubule nucleation and spindle organization.

Absence of Centrosome in Plant Cells

The cellular structure known as a centrosome participates in cell division. The centrosome duplicates prior to cell division, after which the two centrosomes move to the opposite ends of the cell as division gets underway.

  • 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 bands, 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.


Why are Centrosomes Absent in Plant Cells?

The centrosomes are absent in plant cells and they use MTOC structures to coordinate their microtubules. Microtubules are nucleated at organization and nucleation centers in other eukaryotes committed to establishing polarity.

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