asexual propagation
DESCRIPTION
Asexual Propagation. Asexual Propagation?. A= without Therefore asexual= without sex Without sex = No pollination. How?. Clones the parent plant to create identical replicas of the plant. Uses plant parts such as leaves, roots, and stems to start new plants. - PowerPoint PPT PresentationTRANSCRIPT
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Asexual Propagation
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Asexual Propagation? A= without Therefore asexual= without sex Without sex = No pollination
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How? Clones the parent
plant to create identical replicas of the plant.
Uses plant parts such as leaves, roots, and stems to start new plants.
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Reasons to Use Asexual Propagation
To produce uniform, superior plants
Many plants don’t come true from seeds
Some plants don’t produce viable seeds
Take advantage of useful “freaks of nature”
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MutantTissue
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A group of plants derived from a single individual plant.
Disadvantage:NO Genetic Diversity!
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Most common type of asexual propagation
Common Types of Cuttings: Stem Cuttings Leaf Cuttings Leaf Bud Cuttings Root Cuttings
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Rules for Cuttings Typically take cuttings from new
growth Collect cuttings early in the morning Collect cuttings from healthy stock
plants Provide proper environment for
rooting
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Herbaceous CuttingsSucculent greenhouse plants can make numerous cuttings
from parent plant cuttings 2-6 inches long
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Herbaceous CuttingsStem Cuttings remove bottom leaves roots will grow from the node
where leaves were attached Use rooting hormone-
ROOTONEspeeds rooting process
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Rooting HormonesIndoleacetic Acid (IAA) natural plant hormone causes roots to form on stemsIBA & NAA Most commonly used Comes in powder or solution
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The Proper Environment...The Media Must be sterile Must provide air exchange Must hold moisture Bottom heat helps speed rootingThe Atmosphere Need HIGH relative humidity near 100%
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Herbaceous CuttingsLeaf Cuttings
African Violet Use leaf and petiole Rex Begonia Vivaparious leaf cutting Leaf Section cutting Snake plant
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Herbaceous CuttingsLeaf-bud cuttings
cut bud and leaf from stem cut leaf to a smaller size requires less moisture firm into soil, water and cover in a
moisture right container. Can make many more cuttings from parent
plant than with stem cuttings rooting hormone should be weaker
strength.
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Herbaceous CuttingsRoot Cuttings Can be made from any plant that will
sprout or sucker from the root. Cut roots 1/8 to 1/2 inch in diameter in
pieces 1-4 inches long. place in sand in a flat water cover with glass or plastic when new shoots sprout move plants to
nursery row ex: raspberry
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Woody & Semi Woody Cuttings
When to take cuttings: After current or present
seasons growth has partially hardened.
Cuttings should still be able to bend.
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Woody & Semi Woody CuttingsStem Cuttings
Collecting cuttings: Early morning is the best time
to take cuttings.
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Woody & Semi Woody Cuttings Making Cuttings
Make cutting 2-4 inches long.
¼ Inch below a leaf, bud, or side shoot.
Remove any blooms on cutting.
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Woody & Semi Woody Cuttings Caring For Cuttings
Place cutting in a sanitizing water/bleach solution immediately after taking cutting.
Be sure to remember which is the top of the cutting. If you bury the top of the cutting, the
cutting won’t root.
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Woody & Semi Woody Cuttings Caring For Cuttings
Cut bottom at a 45° angle. allows more
surface area to contact media for water absorption.
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Woody & Semi Woody Cuttings Preparing Container
Fill plug tray with sterilized medium. Use a dipple to dipple holes in the
media for easy insertion of cutting.
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Woody & Semi Woody Cuttings Treating Cuttings
Strip cuttings lower leaves. will prevent the cutting from rooting.
Dip cutting in rooting hormone #3. chemicals which help cuttings grow
more quickly and grow a larger number of roots.
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Woody & Semi Woody Cuttings Inserting Cuttings
Place dipped cutting indibbled hole. Gently press media around cutting. Label cutting with name and
variety, include name of rooting hormone used.
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Woody & Semi Woody Cuttings Care of Cuttings With Greenhouse Place finished plug tray in
greenhouse. Water cuttings with an automatic
mist system. Bottom heat tubing stimulates root
growth.
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Woody & Semi Woody Cuttings Care of Cuttings Without Greenhouse Enclose plug tray in clear
plastic. Place out of direct sunlight.
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Woody & Semi Woody Cuttings Rooting Of Cuttings
Check for roots by pulling out cutting. Immature root system= roots don’t
hold soil, so soil crumbles in hand. Root bound= roots coiled tightly
around soil.
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Woody & Semi Woody Cuttings Rooting Of Cuttings
*Mature root system= roots hold soil, so soil doesn’t crumble in hand.
*Ideal and ready to transplant.
Growth on the tips or sides is normal, but does not indicate root growth.