Transcript Flowering Plants Phylum Anthophyta or Magnoliophyta OVULE

EKU General Botany lab
Flowering Plants
Phylum Anthophyta or Magnoliophyta
OVULE DEVELOPMENT
by Ross Clark, Ph.D.
Eastern Kentucky University
photos from various sources
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.
Flowering plant megasporangium
and
functional megaspore metaphase I of meiosis
MEIOSIS
megasporangium is
only one cell thick!
Note megasporocyte
Note that the entire ovule has grown
in size, the integuments have thickened and now
completely surround the megasporangium.
Note ovary wall, locule, funiculus, integuments,
micropyle, megasporangium, megaspore.
Flowering Plants: Growth of female gametophyte
8-nuclear
(7-celled) mature
female
gametophyte
2-nuclear gametophyte
In all pictures, note the gametophyte,
megasporangium, micropyle (when visible)
and locule.
4-nuclear gametophyte
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.
Semi-mature dicot seed
site of old gametophyte
suspensor
seed coat (from integuments)
endosperm (3n or more)
hypocotyl
epicotyl
cotyledon
remnants of
megasporangium
Flowering plant:
summary of ovule
development