sexual recombination of genetic materials to form a unique genetic individual asexual use of...
TRANSCRIPT
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PROPAGATION
Sexual Recombination of genetic materials to
form a unique genetic individual
Asexual Use of vegetative organs to create
plantlets genetically identical to the parent plant
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ASEXUAL PROPAGATION
Asexual Propagation
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ADVANTAGES
Plants are uniform Quick establishment of plants Only means of propagation in certain
speices Seedborne diseases avoided Less expensive Heterozygous material may be
propageted without genetic alteration
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DISADVANTAGES
Systemic viral infection can spread to all plants
Planting materials are bulky Storage of asexual material is
cumbersome and usually short term Genetically identical and thus subject to
the same hazards Mechanized propagation in some cases
not practical
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ASEXUAL PROPAGATION
Divisions Cuttings Layers Grafting/budding Tissue Culture
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DIVISION - SEPARATION
Remove loose soil
Remove dead leaves and stems
Note root system of plant Spreading Clumping Rhizome Tuber
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SEPARATION
Spreading root systems Many slender roots from center of plant Plants can be invasive Cut with shears or pulled apart by hand Asters, bee balm, lamb’s ear, purple
coneflower, many common perennials
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SEPARATION
Clumping root systems Many fleshy roots from crown of plant Can crowd own centers Keep one bud/eye with each division Astilbes, hostas, daylilies, orn. Grasses
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SEPARATION
Rhizome division ‘Horizontal stems’, Primarily bearded
iris Divide after flowering through fall Cut and discard rhizome sections > 1
year Inspect for disease and insect
damage Cut back leaves to ‘fans’ Replant with top of rhizome above
soil level
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SEPARATION
Tuberous roots Enlarged roots for storage Divide with sharp knife Each root must contain stem tissue
and bud Can be replanted or stored Dahlias
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CUTTINGS
Vegetative plant part which is severed from the parent plant in order to regenerate itself, thereby forming a whole new plant
Leaves, stems, roots
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CUTTINGS
Herbaceous: succulent, soft materials (green)
Softwood: soft, succulent growth of woody plants
Semi-Hardwood: partially mature wood of the current season’s growth Mid summer, leaves present
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CUTTINGS
Hardwood: dormant, mature stems Taken before spring growth 6-12 inches Grapes, roses, honeysuckle
Conifer: Obtained in early spring Prefer cool and humid conditions Juniper, spruce
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CUTTINGS: SHOOT
Axillary Bud
Terminal Bud
Stem
Leaf Adventitious Roots
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CUTTINGS
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Cane/Shoot Cutting Leaves Stems Buds
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CUTTINGS: LEAF
Axillary Bud
Terminal Bud
Stem
Leaf
New bud
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LEAF CUTTINGS
Full or partial leaf cuttings African violet, sansivieria
Leaf-vein cuttings Plantlets
Leaf-bud cuttings Rhododendron
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Leaf Cutting Leaf only
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CUTTINGS: LEAF-VEIN
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CUTTINGS: HARDWOOD
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CUTTINGS: HARDWOOD
Cut end of branch
Cambium exposed
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LAYERING
Stems still attached to their parent plant may form roots where they touch a rooting medium
Severed from the parent plant, the rooted plant becomes a new plant
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LAYERING METHODS
Tip Layer Simple Layer Compound Layer
Stooling Air Layer Stolons
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AIR LAYER
Useful procedure on leggy plants
Wound stem and cover with moist medium to induce rooting
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