1 / 14

Layering

Layering. Definition: a propagation method by which stems are rooted while still attached to the parent plant Uses propagation of “trailing” species (e.g., blackberries, raspberries) difficult-to-root species (e.g., filberts, Muscadine grapes, apple, and pear rootstocks)

briana
Télécharger la présentation

Layering

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Layering • Definition: a propagation method by which stems are rooted while still attached to the parent plant • Uses • propagation of “trailing” species (e.g., blackberries, raspberries) • difficult-to-root species (e.g., filberts, Muscadine grapes, apple, and pear rootstocks) • producing larger-sized plant specimens in a short time period (dieffenbachia, crotons)

  2. Layering - advantages and disadvantages • Advantages: simple, but highly effective rooting methods, requiring little equipment/facilities • Disadvantages: slow, labor-intensive, cumbersome methods • Current trends are away from layering in favor of other methods, esp. micropropagation

  3. Simple layering • procedure - part of the stem is buried with the shoot tip out • features: • usu. done in early spring, with dormant, 1-year-old shoots easily bent • usu. rooted by fall • useful for certain shrubs, filberts

  4. How simple layering works • nutrition • stem continues to supply water/nutrients • disrupted phloem (bending, girdling, incision) causes carbohydrate, auxin accumulation at the bend • stress avoidance • because propagule remains attached during rooting • no nutrient leaching (as with mist) • light exclusion • stem sensitivity to auxin, reduced lignin production (etiolation, blanching effect)

  5. Serpentine layering • similar to simple layering - a branch is alternately covered/exposed • useful for Muscadine grapes, Wisteria, Clematis

  6. Air layering • aka pot layerage, circumposition, marcottage, gootee • aerial portion of a stem is girdled or wounded, with moist sphagnum moss (or other medium) used for light exclusion • useful for tropical, subtropical trees/shrubs, including litchi, Ficus,croton, philodendron, etc.

  7. Mound (stool) layering • plants are cut back to “stubs” before new growth starts in the spring • hilling starts when shoots are 3-5 in. long • rooted stoolshoots are removed at the end of the growing season, then planted or stored • mother plant “stubs” are left exposed till the following spring

  8. Trench layering • establishment of the mother bed: 1-year-old trees are planted at a 30˚-45˚ angle • the following season, trees are laid flat in a trench, staked down and covered (just barely) with soil • as buds break and grow out, soil is added, leaving shoot tips exposed • 6-8 in. rooted layers (e.g., ‘Paradox’ walnuts) can be harvested at the end of the growing season

  9. Plant modifications (natural layering) • tip layering • runners and stolons • offsets • suckers • crown division

More Related