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					Plants Also Reproduce Asexually
                     Mr. Chapman
                       Biology 20
          Asexual Reproduction in Plants

• A combination of sexual and asexual
  reproduction allows plants to adapt
  effectively to various conditions.

• Can you remember how sexual and
  asexual reproduction are an advantage?
  It depends on the conditions facing the
  plant.
           Asexual Reproduction in Plants

• Many plants reproduce asexually so that
  a well-adapted plant can make copies of
  itself. Most plants actually have a way of
  cloning themselves.

• Many plants can grow into new plants
  from just a fragment of a stem, leaf, or
  root. When plants reproduce this way,
  they are said to be reproducing by
  regeneration.
Grass often grows in clumps, due to asexual reproduction. If you grab a clump of
grass, odds are that all the blades close to each other are clones of each other.
                  Vegetative Reproduction

• Vegetative reproduction is a type of
  asexual reproduction in which stems,
  leaves, or roots attached to the parent
  plant produce new individuals.

• One of the most stunning examples of
  this is an aspen tree forest in Utah. The
  forest is actually 47000 tree trunks
  growing from the roots of 1 parent
  plant.
                           The Aspen Forest

• Well, I am pretty sure that this video is
  designed to make you want to go to
  Utah:

• http://www.youtube.com/watch?v=8B
  uq8_ikpeE

• Most of the trees that you see in this
  video are actually genetically identical.
     Structures for Asexual Reproduction

• Many structures are actually designed
  for asexual reproduction to take place.
  They include the following:

• Stolons - stolons are horizontal stems
  that grow along the ground. New plants
  can sprout from the stems. This is how
  strawberry plants reproduce.
Strawberries reproduce using stolons, horizontal stems that sprout new
plants.
     Structures for Asexual Reproduction

• Rhizomes – similar to stolons, only
  rhizomes grow underground.

• Tubers – potatoes are examples of
  tubers, which are underground stems.
  The “eyes” of a potato are buds that can
  sprout new plants.

• Bulbs – bulbs (like onions) can divide to
  produce new plants.
Humans Capitalize on Asexual Reproduction

• Vegetative Propagation is the process of
  growing new plants from the fragments of
  another plant.

• This method allows farmers to grow things
  like seedless oranges. Did you ever think of
  how seedless oranges came to be?

• In fact, most apples that we eat come from
  propagated branches rather than trees.
                      Vegetative Propagation
• Vegetative propagation can be achieved by a
  few common methods.

• Some plants are reproduced using cuttings
  from stems or leaves. If the cutting is placed
  in soil or water, it will produce new roots.

• Cuttings are an easy way for horticulturists to
  grow new plants for sale.
                                   Grafting

• Fruit and nut tree growers can actually
  graft parts of one plant to parts of
  another plant.

• By making an incision in a part of a tree
  and inserting a branch from another
  tree, sometimes growers can create a
  tree that produces the desired fruit but
  has other good characteristics, like
  disease resistance.
          Videos for Vegetative Propagation

• Sugarcane Growth

http://www.youtube.com/watch?v=fPraEesXRSs



• Britannica Asexual Reproduction

http://www.youtube.com/watch?v=NfPP2CQGuC0

				
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posted:11/22/2011
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