Plant Reproduction

1
Plant Reproduction
2
(No Transcript)
3
Flower Anatomical Terms

• The male Stamen is composed of a Filament and
  Anther
• The female Carpel (or Pistil) is composed of the
  Stigma, Style, and Ovary (where the ovule forms)
• Accessory reproductive structures include the
  sepals and petals.

4
(No Transcript)
5
Pollen Grain Formation

• Inside the anther four masses of spore-producing
  cells (2n) are formed through mitosis producing
  pollen sacs
• Individual cells now forms 4 Microspores (n)
  through meiosis.
• Each microspore forms two sperm cells (n)
  contained within a single pollen grain

6
(No Transcript)
7
Egg Formation

• Inside the ovule an individual spore-producing
  cell (2n) forms 4 Megaspores (n) through meiosis.
• Three of the megaspores disintegrate while the
  remaining megaspore completes 3 mitotic division
  without cytokinesis.
• Later unequal cytoplasmic division produces 7
  cells, six that are haploid (1n) (one is the egg)
  and one that is (nn) called the endosperm mother
  cell

8
(No Transcript)
9
Double Fertilization

• When a pollen grain land on a receptive stigma
  (Pollination) the two sperm cells contained
  within burrow through the pollen grain.
• One sperm cell forms the Pollen Tube from the
  stigma, through the style, and to the ovule where
  it fertilizes the 2n megaspore forming Endosperm
  (seed plant food)
• The other sperm cell fertilizes the egg cell
  forming the zygote of the seed.

10
(No Transcript)
11
(No Transcript)