Most plants do not have centrioles, so what organelle enables them to multiply?
Answer
There are many different ways to make a spindle in plant cells:
Mitotic spindles may be organized at centriolar centrosomes (only in final divisions of spermatogenesis), polar organizers (POs), plastid MTOCs, or nuclear envelope MTOCs (NE-MTOCs).
Of these, only the latter has been observed in angiosperms (flowering plants). For more info (and the source of the quote), see Brown & Lemmon, "The Pleiomorphic Plant MTOC: An Evolutionary Perspective"
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