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.

Methods of Asexual Propagation (Continued) • Layering a method where the stem is encouraged root while still attached to the parent plant • Examples: – Simple layering – Tip layering – Air layering

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

Methods of Asexual Propagation (Continued) • 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

Seeds • Result of sexual reproduction • Viable: a seed that is alive and capable of germination

That’s all folks…