Transcript vegetative propagation.

Lesson 15
What is vegetative propagation?
Plants are living things, therefore
they reproduce.
Many plants reproduce from seeds.
Others reproduce without seeds.
Reproduction with seeds is sexual
reproduction.
Reproduction without seeds is
asexual reproduction.
Asexual reproduction in plants is
called vegetative propagation.
Roots, stems, and leaves are used
to reproduce one or more new
plants.
Some kinds are natural, happening
in nature, and some are artificial.
Bulbs
A bulb is a really short stem
surrounded by thick colorless
leaves.
The leaves store food made by the
leaves that are above ground.
Why can’t these leaves make food?
stem
colorless
leaves
The stem grows into a new plant
The thick, colorless leaves protect
and feed the bulb when there are
no green leaves to make food.
There are probably two bulbs in
your kitchen right now.
After a year or two,
a bulb grows at
least one
bulbet
A bulbet will start a new plant.
Since there was only one parent
bulb, a bulb is a form of asexual
reproduction.
Tuber
A tuber is a heavy
underground stem.
It stores food made by the above
ground green leaves.
The potato is a
tuber. The sweet
potato is NOT.
Potatoes have “eyes” which will
generate a new plant.
The things you find
growing from your
potatoes that have
sat a long time will
grow above the
ground to make a
new plant.
If we cut the
potato so that
each piece has an
eye, and plant
them, we get
new plants.
How many new plants can we get
from this potato?
Two kinds of artificial vegetative
propagation are cuttings and
graftings.
A cutting is when you take a stem
or a leaf from a plant and make it
grow into a new plant.
These stems were cut
from a plant and put
in a glass of water.
What happened????
Now that they have roots, they can
be planted, and a new plant has
formed.
Grafting is attaching a stem
cutting of one plant to another.
A stem was grafted
onto this tree
The stem and
trunk will grow
together.
Grafting is most often done with
fruit trees.
It can be done only with related
plants.