plastids in pollen

Kathleen Archer Kathleen.Archer at
Wed Oct 13 09:59:56 EST 1999

All plant cells contain plastids.  Even epidermal cells, which do not
contain *chloroplasts* and are not green, do contain plastids.  Plastids
are essential for far more than just photosynthesis, carrying out a ton of
other metabolic activities including amino acid synthesis, lipid synthesis,
various steps in the production of secondary products, etc.
Pollen grains do contain plastids, but there are various mechanisms for
excluding them from the egg.  I believe that some microgametophytes may
exclude them from the pollen tube itself, so that sperm nuclei are
delivered without plastids nearby.  There are other exclusionary
strategies, but I can't remember the details on how they all work.
Kathleen Archer

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