lecture 3 reproductive structures
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LECTURE 3 REPRODUCTIVE STRUCTURES Flowering Floral Induction Leaves Floral Stimulus Florigen Phloem Transport Floral Evocation Reproductive Apex Leaf Primordia → Floral Primordia Sepals (A) Petals (A+B) Stamens (B+C) Pistils (C) Vegetative Apex SAM Tunica Corpus

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Presentation Transcript
flowering
Flowering
  • Floral Induction
    • Leaves
    • Floral Stimulus
      • Florigen
      • Phloem Transport
  • Floral Evocation
    • Reproductive Apex
    • Leaf Primordia → Floral Primordia
      • Sepals (A)
      • Petals (A+B)
      • Stamens (B+C)
      • Pistils (C)
vegetative apex
Vegetative Apex
  • SAM
    • Tunica
    • Corpus
  • Leaf Primordia
inflorescence apex
Inflorescence Apex
  • Multiple Reproductive Apical Meristems
  • Floral Primordia
    • Sepals
    • Petals
    • Stamens
    • Pistils
floral primordia
Floral Primordia
  • Whorls
    • 1 - Sepals
    • 2 - Petals
    • 3 - Stamens
      • Anther
      • Filament
    • 4 - Carpels
      • Stigma
      • Style
      • Ovary
slide7
stigma

style

petal

petals andcorolla

anthers

stigma

filament

anther

hypanthium

ovules

ovary

ovary

filament

sepal scar

stigma

anther

style

filament

petal

sepal

ovary

receptacle

hypanthium

Fig. 13-12, p. 203

slide8
bract

umbel

ray flowers

disc flowers

pedicel

bract

receptacle

raceme

panicle

spike

cyme

head

Fig. 13-13, p. 204

alternation of generations
Alternation of Generations
  • Sporophyte (2N)
    • Diploid (2N)
    • Vegetative Phase
    • Mitosis
  • Gametophyte (1N)
    • Haploid (1N)
    • Reproductive Phase
    • Meiosis
male gametophyte
Male Gametophyte
  • Stamen
  • Anther

4 Locules

Attached to Filament

Tapetal Cells

  • Microsporocytes (2N)

Meiosis

  • Microspores (4 x 1N)

Tetrads

  • Pollen Grains (1N)

Complex Cell Wall

Exine

Intine

Generative Nucleus

2 x sperm nuclei

Tube Nucleus

slide11
filament

anther

Meiosis

pollensac

tapetum

two-cell stage

four-cell stage

microsporocyte

Pollen sac

anther

filament

Mitosis

germinated

pollen grain

tube cell

generative cell

pollen tube

sperm cells

tube nucleus

stamen

pollen grain

(male gametophyte)

microspores

tube nucleus

Fig. 13-2, p. 197

female gametophyte
Female Gametophyte
  • Pistil
    • Stigma
    • Style
    • Ovary
    • Ovules
  • Megasporocyte (2N)
  • 4 Megaspores (1N)
  • 1 Cell Gametophyte
  • 2 Cell Gametophyte
  • 4 Cell Gametophyte
  • 8 Cell Gametophyte
      • 1 Egg Cell
      • 2 Synergids
      • 2 Polar Nuclei
      • 3 Antipodals
fertilization
Fertilization
  • Pollination

Compatable Stigma

Genetic Regulation

  • Pollen Germination

Environmental Regulation

Humidity

Temperature

  • Pollen Tube Growth

down Style

to Ovary

into Ovule

  • Double Fertilization

2 Sperm Nuclei (2 x1N)

1 Sperm (1N) + Egg Cell (1N)

Zygote (2N) - Sporophyte

1 Sperm (1N) + 2 Polar Nuclei (2 x 1N)

Triploid Endosperm (3N)

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