Plant Reproduction

Zygote(2n)

MITOS SIMEIOS SI

Seed (dispersesvia wind or animals)

Developingsporophyte

Maturesporophyteflower (2n)

Bottom ofcarpel Megasporangium

Nutritive tissue (3n)

Embryo (2n)

Endosperm (3n)forms nutritivetissue in seed

Megaspore(n: retainedin ovary)

Ovary

MITOS SI

DOU

BL E

FERTILI

ZATI

ON

EggFemale gametophyte(n: retained in ovary)

Pollen grain(male gametophyte)

Microspore (n)forms pollen grain

SSIOTIMM SSIOIE

Ovule

Top ofstamen

Anther

POLLINATION

stigma

style

ovary

ovule

megasporocyte

micropyle

The carpel

Creation of the megaspore

megaspore

Creation of the megaspore

Creation of the female gametophyte

Polarnuclei

Eggnucleus

Creation of the female gametophyte

Polarnuclei

Eggcell

Mature female gametophyte = embryo sac

Review:

Megasporocyte(2N)

Megaspore(N)

meiosis

Megaspore(N)

Female gametophyte(N)

Mitosis and rearrangement

Female gametophyte contains the egg cell

Stamen

anther

filament

Pollen sac

Cross section of an anther

microsporocyte

Creation of microspores

microspore

microsporocyte

microsporocyte microsporemeiosis

Creation of microspores

Review:

Next step: creation of male gametophyte

exine

Pollen grain

Generative cellTube cellnucleus

pollination

Tube nucleus

Generativenucleus

Pollen germination

Tube nucleus

sperm

sperm

Tube nucleus

MatureMale gametophyte

Review:

microsporocyte(2N)

microspore(N)

meiosis

microspore(N)

Male gametophyte(N)

Mitosis and rearrangement

Male gametophyte contains the sperm

Polarnuclei

Eggcell

sperm

Tube nucleus

Polarnuclei

Eggcell

sperm

Tube nucleus

Polarnuclei

Eggcell

2N

Zygote

3N

Primaryendospermnucleus

Double Fertilization

endosperm

embryo

Seed coat

fruit

Bean seed(typical eudicot)

Corn seed(typical monocot)

Seed coat

Endosperm

Cotyledons

Embryonicstem and root