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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LECTURE 3 REPRODUCTIVE STRUCTURES

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Lecture 3 reproductive structures l.jpg

LECTURE 3 REPRODUCTIVE STRUCTURES


Flowering l.jpg

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 l.jpg

Vegetative Apex

  • SAM

    • Tunica

    • Corpus

  • Leaf Primordia


Inflorescence apex l.jpg

Inflorescence Apex

  • Multiple Reproductive Apical Meristems

  • Floral Primordia

    • Sepals

    • Petals

    • Stamens

    • Pistils


Floral primordia l.jpg

Floral Primordia

  • Whorls

    • 1 - Sepals

    • 2 - Petals

    • 3 - Stamens

      • Anther

      • Filament

    • 4 - Carpels

      • Stigma

      • Style

      • Ovary


Floral organs l.jpg

Floral Organs


Slide7 l.jpg

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 l.jpg

bract

umbel

ray flowers

disc flowers

pedicel

bract

receptacle

raceme

panicle

spike

cyme

head

Fig. 13-13, p. 204


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Alternation of Generations

  • Sporophyte (2N)

    • Diploid (2N)

    • Vegetative Phase

    • Mitosis

  • Gametophyte (1N)

    • Haploid (1N)

    • Reproductive Phase

    • Meiosis


Male gametophyte l.jpg

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 l.jpg

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 l.jpg

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


Slide13 l.jpg

Fig. 13-7, p. 200


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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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