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#141 plant sperm cell (PO:0000084) and children

plant anatomy
closed-accepted
Laurel Cooper
1
2012-12-27
2010-07-15
Ramona Walls
No

The current definition of sperm cell (A haploid male reproductive cell (usually two in number); during double fertilization, one fuses with the female gamete (egg cell) to produce a zygote while another fuses with the two polar nuclei of the central cell to give rise to endosperm.) only applies to angiosperms.

Proposed definition: A gamete produced by a male gametophyte.
Comment: In angiosperms, sperm cells are usually two in number; during double fertilization, one fuses with the egg cell to produce a zygote while another fuses with the two polar nuclei of the central cell to give rise to endosperm.

Discussion

  • Will not work for the same reason as for egg

     
  • Pankaj Jaiswal
    Pankaj Jaiswal
    2010-07-15

    would this qualify as a 'micro gamete' as well.

     
  • Ramona Walls
    Ramona Walls
    2010-11-11

    • priority: 7 --> 5
    • status: open --> closed-fixed
     
  • Ramona Walls
    Ramona Walls
    2010-11-11

    At the POC meeting on 10-5-2010, we accepted the following definition: A gamete produced by an antheridium or a microgametophyte.
    Comment: The sperm (microgamete) is usually larger than the egg (megagamete). In angiosperms, sperm cells are usually two in number; during double fertilization, one fuses with the egg cell to produce a zygote while another fuses with the two polar nuclei of the central cell to give rise to endosperm.
    Syn: microgamete [exact], sperm nucleus [related]

    Sperm cell will be kept as a general term. We will add two new terms: antheridium sperm cell and pollen sperm cell. Only these child terms will have part_of relations to antheridium or microgametophyte.

    I am closing this item.

     
  • Ramona Walls
    Ramona Walls
    2011-03-29

    • priority: 5 --> 8
    • status: closed-fixed --> open-fixed
     
  • Ramona Walls
    Ramona Walls
    2011-03-29

    At the POC meeting on 3-22-11 and 3-29-11, we came up with new definitions for antheridial and pollen sperm cell.

    Proposed definitions:

    antheridial sperm cell (PO:0025120): A sperm cell that is produced by an antheridium.

    only_in_taxon bryophytes plus pteridophytes (or never_in seed plants), part of antheridium

    pollen sperm cell (PO:0025121): A sperm cell that is produced by a pollen grain.

    Comment: A pollen sperm cell consists of a nucleus without a cell wall.

    only_in_taxon seed plants, part_of pollen

    For Gnetum and Weltwischia, should just use parent terms (egg cell or sperm cell).

     
  • Ramona Walls
    Ramona Walls
    2011-04-01

    These definitions were accepted at the POC meeting on 3-29-11.

    Set this item to pending. Will close automatically if no one comments on it.

     
  • Ramona Walls
    Ramona Walls
    2011-04-18

    (from DWS): We should add a comment: "Motile sperm cells do not have a plasma membrane."

     
  • Laurel Cooper
    Laurel Cooper
    2011-04-29

    Suggest we add the comment below from DWS to antheridial sperm cell:

    antheridial sperm cell (PO:0025120): A sperm cell that is produced by an antheridium.

    Comment: Antheridial sperm cells are motile and lack a plasma membrane.

     
  • Laurel Cooper
    Laurel Cooper
    2011-04-29

    • assigned_to: rwalls --> nobody
    • priority: 5 --> 9
    • status: open-fixed --> open
     
  • Laurel Cooper
    Laurel Cooper
    2011-04-29

    Suggest the revised def'n:

    pollen sperm cell (PO:0025121): A sperm cell that is produced in a pollen grain.

    and suggest revised comment: (its a little long...)
    In Angiosperms, usually two in number, during double fertilization, one fuses with the female gamete (egg cell) to produce a zygote while another fuses with the two polar nuclei of the central cell to give rise to endosperm.

    Pollen sperm cells are structurally simple, apparently nonmotile cells that contain a normal complement of cellular organelles, including heritable cytoplasmic organelles such as mitochondria and, in some plants, plastids, but lack a cell wall.
    (modified from Citation: Russell, 1991 Annual Review of Plant Physiology and Plant Molecular Biology, 42, 189-204)

    only_in_taxon seed plants, part_of pollen

     
  • I all seed plants the number is two, except for Microcycas and Ceratozamia. Fusion with tye ventral canal cells has been observed, albeit rarely. in Ephedra and some conifers.

     
  • Laurel Cooper
    Laurel Cooper
    2011-05-02

    Suggest rename 'plant sperm cell' (PO:0000084): A gamete produced by an antheridium or a microgametophyte.

    revisions to comment:
    Corrected error: The sperm (microgamete) is usually SMALLER than the egg (megagamete). Male gametes may be defined as the motile gamete, rather than the smaller gamete.

    Suggest that the rest of the comment be moved to pollen sperm cell ("In seed plants, pollen sperm cells are usually two in number. In Angiosperms, during double fertilization, one fuses with the egg cell to produce a zygote while another fuses with the two polar nuclei of the central cell to give rise to endosperm.)

     
  • Laurel Cooper
    Laurel Cooper
    2011-05-02

    pollen sperm cell (PO:0025121): A sperm cell that is produced by and located in a pollen grain.

    Suggest revised comment:
    Pollen sperm cells are structurally simple, apparently nonmotile cells that contain a normal complement of cellular organelles, including heritable cytoplasmic organelles such as mitochondria and, in some plants, plastids, but lack a cell wall. In seed plants, pollen sperm cells are usually two in number. In Angiosperms, during double fertilization, one fuses with the egg cell to produce a zygote while another fuses with the two polar nuclei of the central cell to give rise to endosperm.

     
  • Ramona Walls
    Ramona Walls
    2011-05-03

    The new definition and comment are good. I suggest the following small changes (in CAPS):

    Def: A PLANT sperm cell that is produced by and located in a pollen grain.

    Comment: Pollen sperm cells are structurally simple, USUALLY non-motile cells
    that MAY contain a normal complement of cellular organelles, including
    heritable cytoplasmic organelles such as mitochondria and, in some plants,
    plastids, but lack a cell wall. In seed plants, pollen sperm cells are
    usually two in number. In Angiosperms, during double fertilization, one
    fuses with the egg cell to produce a zygote while another fuses with the
    two polar nuclei of the central cell to give rise to endosperm.

    I would say "usually non-motile" because Gingko and cycads have flagellated sperm. Also suggest saying that they "may contain a normal complement of cellular organelles," because the complement of organelles is variable among taxa.

    Also, we should add Russell 1991 as a definition dbxref.

     
  • Laurel Cooper
    Laurel Cooper
    2011-05-03

    I agree with RW's comments below re: pollen sperm cell. Looks good.

     
  • Ramona Walls
    Ramona Walls
    2011-05-10

    • priority: 9 --> 1
    • status: open --> closed
     
  • Ramona Walls
    Ramona Walls
    2011-05-10

    Closing this item.

     
  • Laurel Cooper
    Laurel Cooper
    2012-12-06

    I think this must be an error in the comment:
    antheridium sperm cell (PO:0025120): A plant sperm cell that is produced by and located in an antheridium.

    Comment: Antheridial sperm cells are motile and lack a plasma membrane.

    Shouldn't this be: "lack a cell wall"? How can they lack a plasma membrane?

     
  • Laurel Cooper
    Laurel Cooper
    2012-12-12

    This was discussed on the POC call 12-11-12:
    Accepted revised def'ns:
    pollen sperm cell (PO:0025121) as: A plant sperm cell (PO:0000084) that is part of the pollen (PO:0025281).

    Revised comment: In angiosperms, the pollen sperm cell arises from the generative cell (PO:0020097). It gymnosperms, the pollen sperm cell arises from the body cell (PO:0025525).

     
  • Ramona Walls
    Ramona Walls
    2012-12-12

    Uh, yeah. I think that was supposed to be lacks cell wall.

     
  • Laurel Cooper
    Laurel Cooper
    2012-12-27

    These revisions have been accepted- closing this tracker, but will leave open for comments.