3. Contd.
• the stem or root which is rooted
is called a layer
• the layer is removed from the
plant only after rooting has
taken place
4. Contd.
• Layering is the process of
developing new plantlets
in which root formation
takes place on layered
portion of stem before they
are severed from mother
plant.
5. Principles of Layering
• Through notching or girdling,The
downward tranlocation of carbohydrates,
hormones and other organic substances is
interrupted by the removal of the bark .
• This carbohydrates, hormones and other
organic substances are accumulated in the
girdled site where dormant adventitious
buds regenerates and give rise to root.
6. Simple Layering
• a branch from the parent plant
is bent to the ground
• covered with soil at one point
• terminal end remains exposed
16. Air Layering
• Ancient Chinese practiced air
layering
• process eliminates burying
part of the plant in the soil
17. Air Layering
• instead, a part of the stem is
girdled
• cut all the way around
• the cut is surrounded by moist
sphagnum or peat moss
18. Air Layering
• Moss is wrapped with plastic to
hold in place
• roots grow from the wound on
the stem
19. Air Layering
• Plants that propagate well this
way:
• Rubber Tree
• Persian Lime
• Magnolia
20. Air Layering
• When rooting is complete
• 4-6 weeks
• cut layer BELOW roots and
transplant
• Parent portion will continue to
grow and form new branches