Asexual reproduction


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Asexual reproduction

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