Objective 20.02 Discuss methods of asexual propagation using plants that are typically reproduced asexually
Propagation Increasing the number of a plant species or reproduction of a species
Sexual Propagation Use of seed for reproducing plants Only way to obtain new varieties Increase hybrid vigor of plants Less expensive Quicker than other methods
Asexual Propagation Use of a part or parts of a plant for reproducing plants Also called vegetative propagation The new plant is an exact duplicate of the parent plant
Methods of Asexual Propagation Cuttings are vegetative parts that the parent uses to regenerate itself Examples: –Leaf cuttings –Root cuttings –Stem cuttings
Methods of Asexual Propagation (Continued) Rooting hormone: a substance applied to cuttings to speed up the root development.
Layering a method where the stem is encouraged root while still attached to the parent plant Examples: –Simple layering –Tip layering –Air layering Methods of Asexual Propagation (Continued)
Air layering Propagation method where a stem is girdled, treated with a rooting hormone, and surrounded with damp sphagnum moss and plastic until new roots appear.
Methods of Asexual Propagation (Continued) Division: by dividing or separating the main part of the plant into small parts Examples: –Day lilies
Methods of Asexual Propagation (Continued) Grafting: joining two plants together as they grow as one –T-budding is the most common type
Methods of Asexual Propagation (Continued) Root cutting: a type of cutting made when the plant is dormant and its roots have a reserve of carbohydrates Can harm parent plant Examples: –Roses –Blackberries –lilacs
Tissue culture or micropropagations: the use of very small and actively growing parts of the plant to produce a high number of new plants –Cloning is achieved by tissue culture Methods of Asexual Propagation (Continued)
Seeds Result of sexual reproduction Viable: a seed that is alive and capable of germination