Flowering Plants Phylum Anthophyta or Magnoliophyta OVULE DEVELOPMENT

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Flowering PlantsPhylum Anthophyta or
MagnoliophytaOVULE DEVELOPMENT
EKU General Botany lab
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Flowering plant ovary and ovules
microsporangium
Note anthers ovary ovules locules
very young ovule
How many locules are there in these ovaries?
ovary wall
How many carpels make up this ovary?
slightly older ovules
Both of these photos are transverse sections
of flower buds.
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Flowering plant megasporangiumandfunctional
megaspore
This cell is now haploid.
MEIOSIS
megasporangium is only one cell thick!
Note that the entire ovule has grown in size, the
integuments have thickened and now completely
surround the megasporangium.
Note megasporocyte
Note ovary wall, locule, funiculus,
integuments, micropyle, megasporangium, megaspore.
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Flowering Plants Growth of female gametophyte
8-nuclear (7-celled) mature female gametophyte
2-nuclear gametophyte
In all pictures, note the gametophyte, megasporang
ium, micropyle (when visible) and locule.
4-nuclear gametophyte
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Flowering plant mature gametophyte and
fertilization
the moment of double fertilization !
The mature (7-celled, 8-nuclear) gametophyte.
Male and female gametes fusing

Polar nuclei fusing
Notice that the micropyle end is at opposite ends
of these two pictures.
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Flowering plantsummary of ovuledevelopment