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Asexual reproduction

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  • 1. Propagating Plants Asexually
    Unit. Plant Science
    Problem Area. Plant Propagation
  • 2. Asexual reproduction
    in plants involves
    the propagation of new plants using
    only the vegetative parts of the
    parent plant.
    Asexual propagation enables the production of a plant that would otherwise be difficult or impossible to cultivate because the plant does not produce viable seed or the seed is difficult to germinate.
  • 3. Asexual = Genetic Clone
    maintain certain genetic forms of the plant
    may be faster than propagation by seed
    May be more economical
    in many cases it is easier
  • 4. What are the different methods of asexual reproduction?
    Cuttings
    Stems, roots, leaves
    Separation
    Division
    Layering
    Grafting
    Budding
    tissue culture
  • 5. 1. A stem cutting is a cut portion of a stem that contains a terminal bud or lateral buds and is placed in growing media to produce roots.
    a. Softwood cuttings—from soft, succulent growth.
    b. Hardwood cuttings—from one-year-old growth, deciduous, or evergreen plants.
    c. Semi-hardwood cuttings—from woody broad-leaved plants with new shoots.
  • 6. A leaf cutting consists of a leaf blade or leaf blade with petiole attached.
    A leaf-bud cutting consists of a leaf, petiole, and a short piece of stem with a lateral bud.
  • 7. root cutting uses the root or part of the root
    Root cuttings are not as predictable as other cuttings, being more dependent on seasonal influences.
  • 8. Rooting
    Temperature of the medium is kept between 75°F and 80°F
    High humidity with misting
    • Adventitious roots are roots that begin growth from the stem or a leaf
    • 9. Most plants do best in a loose, well-drained growing medium
    • 10. Rooting hormones can aid in rooting difficult plants
  • Division Vs. Separation
    Removal and planting of vegetative structures is separation.
    With division, the entire plant is cut into sections to make two or more plants
  • 11. Layering is a method in which roots form on a stem while it is still attached to the parent plant
  • 12. Grafting
    Connecting two plant parts in such a way that they will unite and continue to grow as one plant.
    Scion is a short piece of stem with two or more buds, and the rootstock is the lower portion of the graft.
    can have a dwarfing effect on the stem.
    increase the hardiness of a plant.
    Disease resistance in a plant can be improved
    change the natural form of a plant.
    to asexually propagate plants that are difficult to propagate
    Grafting is often used in the production of orchard trees, shade trees, and roses.
  • 13. Grafting
    Whip-and-tongue grafting is commonly used to propagate fruit trees.
  • 14. Cleft grafting is often used to join a smaller scion to a larger stock part.
    Bark grafting is similar to cleft grafting in that it joins smaller scion wood to a larger rootstock.
    Budding is similar to grafting except that the scion is reduced to a single bud with a small portion of bark or wood attached.
  • 15. Tissue culture, or micropropagation, is a very technical method of asexual propagation that involves the growing of plant cells or tissues on artificial media under sterile conditions.
  • 16. Advantages of Tissue Culture
    Large numbers of plants can be produced
    from a single plant in a relatively small
    space in a short period of time.
    Viruses and other systemic diseases are eliminated by propagating the quickly dividing cells of the shoot tip.
    Tissue culture gives the grower a means to produce plants with identical traits.
    Horticultural cultivars can be improved by selecting plants that vary slightly from the parent plant.
    Tissue culture is a required technique for producing genetically engineered plants.