colorado agriscience 1 colorado agriscience plant science unit 4: reproduction & genetics lesson...
TRANSCRIPT
Colorado AgriScience Colorado AgriScience 11
Colorado AgriScience Colorado AgriScience Plant Science Plant Science Unit 4: Reproduction & Genetics Unit 4: Reproduction & Genetics
Lesson 5: Asexual Propagation IILesson 5: Asexual Propagation II
Colorado AgriScience Colorado AgriScience 22
Layering Layering
In many plants stems will In many plants stems will develop roots in any area in develop roots in any area in contact with the medium while contact with the medium while still attached to the parent plantstill attached to the parent plant
AdvantagesAdvantages Plant doesn’t experience water Plant doesn’t experience water
stressstress Sufficient carbohydrates are Sufficient carbohydrates are
supplied to the developing plantsupplied to the developing plant
Colorado AgriScience Colorado AgriScience 33
Simple Layering Simple Layering
Common on:Common on: Azaleas, rhododendrons, & other Azaleas, rhododendrons, & other
plantsplants A stem is bent to the ground & A stem is bent to the ground &
covered with medium covered with medium Wound the bottom side of the Wound the bottom side of the
stem in the medium stem in the medium The last 6-10” of stem is left The last 6-10” of stem is left
exposedexposed
Colorado AgriScience Colorado AgriScience 44
Simple Layering Simple Layering
Colorado AgriScience Colorado AgriScience 55
Tip Layering Tip Layering
Common in Raspberries & Common in Raspberries & Blackberries Blackberries
Make a hole in the medium next to Make a hole in the medium next to the parent plantthe parent plant
Place the tip of a shoot in the hole & Place the tip of a shoot in the hole & cover itcover it
The tip will grow down & then upThe tip will grow down & then up Roots will form at the bendRoots will form at the bend When the new tip appears above the When the new tip appears above the
medium it is ready for transplanting medium it is ready for transplanting
Colorado AgriScience Colorado AgriScience 66
Tip Layering Tip Layering
Colorado AgriScience Colorado AgriScience 77
Air Layering Air Layering
Stem is girdled with 2 cuts 1” Stem is girdled with 2 cuts 1” apartapart
Remove barkRemove bark Dust wound with rooting Dust wound with rooting
hormone & surrounded in damp hormone & surrounded in damp sphagnum mosssphagnum moss
Wrap plastic around moss & tie Wrap plastic around moss & tie at both endsat both ends
Colorado AgriScience Colorado AgriScience 88
Air Layering Air Layering
In a few weeks roots will appear In a few weeks roots will appear throughout the mossthroughout the moss
Cut the stem just below the Cut the stem just below the newly formed root ballnewly formed root ball
Plant the ball into a well drained Plant the ball into a well drained potting medium potting medium
Colorado AgriScience Colorado AgriScience 99
Air Layering Air Layering
Colorado AgriScience Colorado AgriScience 1010
Division Division
Some plants are easily Some plants are easily propagated by separating the propagated by separating the main part into smaller partsmain part into smaller parts
Plants with rooted crowns are Plants with rooted crowns are separated by cutting or pulling separated by cutting or pulling them apartthem apart
Plant the clumps separately Plant the clumps separately
Colorado AgriScience Colorado AgriScience 1111
Division Division