Transcript Asexual Propagation (vegetative)

Asexual Propagation (vegetative)
http://mercury.bio.uaf.edu/courses/biol105/Lectures/Section5/photos/asexual_repro_stolon.jpg
Objective
 Important Factors in Asexual
Propagation
 Different Methods of Cuttings (Tip,
Stem, Leaf)
The Role Certain Hormones contribute to
Asexual
propagation
Asexual Propagation (vegetative)
 Result in Clones, which are genetically
identical to the parent
 Asexual propagation is possible because
plant cells are totipotent--
 Dedifferentiation is the capability of
mature cells to return to a meristematic
condition and develop a new growing point.
Asexual Propagation (vegetative)
Totipotency
-----That is each cell
retains the potential
(and genetic
information) to generate
an entire plant
So we can generate whole
plant from a leaf, stem,
roots…..
http://w3.dwm.ks.edu.tw/bio/activelearner/16/images/ch16c4.jpg
Why we go for??
Asexual Propagation
1.Propagation of seedless plants, i.e. bananas, figs, oranges and grape
2. Avoidance of long juvenile periods as in Citrus can take 5 to 10
years to bloom.
3. Disease control Meristematic regions in shoot tips can sometimes
outgrow virus infections because of rapid cell division. These regions
can be excised and placed into tissue culture to propagate virus-free
plants.
4. Rapid production of some plant materials, especially trees
Asexual Propagation (vegetative)
 Stolons
 Budding
 Suckers
 Division
 Layering
 Grafting
 Separation
Cuttings
Stolons
Strawberry..
-an above-ground stem that
has buds that sprout to form
new shoots, forming a new,
genetically-identical plant.
--The strawberry plant
clones during springtime
by producing stolons
around the mother plant.
www.botgard.ucla.edu/.../ stolon/b0072tx.html
http://www.uga.edu/fruit/rubus.htm
Suckers
Black berry suckers..
-is a root that
emerges from
the ground and
sends up a shoot
which supports
the plant.
http://www.uga.edu/fruit/rubus.htm
Separation
Hyacinth bulb
with bulblets
Gladiolus
classes.aces.uiuc.edu/ NRES103/3473-69.htm
trc.ucdavis.edu/.../ corm-gladiolus74lable.jpg
Layering
Grapes, Litchi…
Tip Layering -
Bend tips until they
touch the ground,
and then cover them
with soil.
Air Layering Wounding or
Girdling to produce
roots
www.gardens.co.nz/ Articles.cfm?NLID=124
www.ces.ncsu.edu/ hil/hil-8701.html
Division
www2.ville.montreal.qc.ca/ jardin/info_verte/f...
Division
Ginger..
-Specialized stem
in which main axis
grows horizontally
at or just below
ground surface.
--Cut off individual
sections at point of
attachment to the
rhizome. Each piece must
have a lateral bud.
houseandhome.msn.com/ garden/plantdivisionmade...
Cuttings
--Produce adventitious roots.
Cells near the wound must dedifferentiate
and create a new meristematic region.
--3 different types of cuttage propagation
--Tip
--Stem, and
--Leaf
http://www.mygarden.me.uk/Streptocarpus%20leaf%20cuttings%204%20June.jpg
Tip Cuttings
Stem Cuttings
--Consist of a stem segment
with the terminal bud
intact.
hibiscus-sinensis.com/ hibiscus/cuttings.htm
--terminal bud has been
removed for stem cuttings
intact.
Stem Cuttings
Tip Cuttings
Rooted Stem cutting (left) Rooted tip cutting (right).
Leaf Cuttings
Peperomia
The pot with cuttings inserted about one inch into the media
and watered in. Note that the cuttings are not in contact
with each other or the sides of the pot.
www.asahi-net.or.jp/.../ contents/cuttings_e.html
Leaf Cuttings
---Different ways
http://academic.kellogg.edu/herbrandsonc/bio111/images/greenhouse/bots3160.jpg
Polarity
Snake Plant
www.bulbsociety.com/.../ Eucomis_leafcutting.html
Plantlets
Mother of Thousands
http://warpedvisions.org/images/mother_of_thousands.jpeg
Plantlets
Spider Plant
http://plantoasis.com/plants/1001_1020/images/1009_spider_plant_Big.jpg