Asexual Propagation Done by My Prof.

Topics: Plant reproduction, Grafting, Horticulture and gardening Pages: 8 (608 words) Published: July 21, 2013
1/3/2013

God and plant propagation

Asexual/vegetative propagation
(Essential skills in nursery management)

• " 'This is what the Sovereign LORD says: I myself will take a shoot from the very top of a cedar and plant it; I will break off a tender sprig from its topmost shoots and plant it on a high and lofty mountain. 23 On the mountain heights of Israel I will plant it; it will produce branches and bear fruit and become a splendid cedar.” (Ezekiel 17)

Why use asexual propagation?
• • • • • • • • Uniformity Propagate non-seed producing plants Avoid seedborne diseases To create insect or disease resistant plants To incorporate environmental tolerances To reproduce and retain the genetic traits of a hybrid Control size and form of a plant Can be faster and easier, cheaper

Disadvantages of asexual propagation
• • • • Uniformity Short storage time Bulky Systemic infections can be spread • • • • •

Types of asexual propagation
Specialized parts Cuttings Layering Grafting Tissue culture

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Specialized plant parts
• Offshoots • Separation • Division

Division

Division - rhizomes

Division of rhizomes

Division

Division

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Division – fleshy roots

Division – tuberous roots

Separation
• Bulbs • Corms

Separation – bulbs

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Separation – bulbs

Separation - bulbs
• Amaryllis (a tunicate bulb)

Scooping bulbs

Separation – scaly bulbs

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Separation - corms
• Herbaceous • Woody plants

Cuttings

– Softwood – Semi-hardwood (ripe) – Hardwood

Cuttings
• Herbaceous
– – – – Stem Stem tip Leaf bud Leaf

Leaf cuttings

Whole leaf cuttings

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Leaf cuttings

Keep moist at all times

Leaf cuttings

Cuttings from variegated plants

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Roots tend to develop at nodes

Cuttings
• Softwood – late spring, new growth • Semi-hardwood (ripe) – summer, recent growth • Hardwood – late fall (dormant), 1 yr. growth

Semi-hardwood (ripe) cuttings

Semi-ripe: Leaf-bud cuttings

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Cutting principles
• • • • • • • • • • Age of material Correct seasonal timing Sterile rooting medium, sanitation High humidity No direct sun Shoots without flowers or flower buds Node near base of cutting Rooting hormones Basal wounding of woody cuttings Remove leaves in contact with rooting medium

Bottom heat aids in rooting

Runners

Layering

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Types of layering
• • • • • • Simple layering Tip layering Compound layering Mound layering Trench layering Air layering

Tip layering
• Limited to brambles

Simple layering
• Layer in Spring with 1 yr. old wood –rooted by fall--remove

Rooting layers

Compound (serpentine) layering
• Use with flexible vines

Mound layering
• Used for rootstock production in nursery trees

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Trench layering

Air layering
• Developed by Chinese

Air layering

Grafting
• • • • •

Why graft?
Incorporate disease, insect resistance (link) Incorporate temperature tolerance Quickly increase # of a desirable type Change cultivar of fruit in an orchard Control form (dwarfing, weeping, tree mums & roses) • Repair bark damage

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Grafting principles
• Contact between vascular cambium of scion and rootstock • • • •

Grafting principles
Taxonomic compatibility Timing of graft (dormant scion) Waterproof graft junction Rootstock diameter > scion diameter

Whip or Tongue grafting
• Most common grafting method

Grafting over
• Adding a cultivar to an established fruit tree
– Replace the existing cultivar – Add a new pollinator – Try a new cultivar

• Top-working • Frame-working

Bark grafting (Rind graft)

Cleft grafting

Topworking

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Double working
• Using an interstock to graft an incompatible scion to a rootstock – Interstock is compatible with both scion and rootstock

Side grafting

Flat grafting cacti Approach grafting
• Use when detached...
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