GREENHOUSE MANAGEMENT Asexual Propagation

Objectives Define terms associated with asexual propagation. Explain how the different methods of asexual propagation are performed. Demonstrate the correct procedure of asexual propagation by using cuttings.

Terms Air layering Asexual propagation Cloning Crown Cutting Disinfectant Division Girdling Grafting Growth regulator Layering Leaf bud cutting Root cutting Stem cutting Stock plant Tissue culture vegetative

Terms Crown- part of the plant that enters the soil Disinfectant- a material that destroys infective agents such as bacteria and viruses Girdling- wounding; restricts the function of the xylem or phloem of a dicot plant Growth regulator- a substance that influences plant growth

Asexual Propagation Process of reproducing plants without seeds Uses the leaves, buds, stems, and roots of plants to produce new plants Also called vegetative

Cuttings Cutting- vegetative plant part that regenerates roots and forms new plants Stock plants- a plant from which cuttings are taken Can be made from portions of stems, leaves, or roots

Stem Cutting Cut portion of a stem that contains a terminal bud of lateral buds and is placed in growing media to produce roots

Leaf Cutting Consists of a leaf blade or leaf blade with petiole attached Leaf blade  new plant forms at the point where the veins are cut Leaf blade with petiole  Roots will form at the end of the petiole; new shoots will emerge at the base of the petiole

Leaf Bud Cutting A cutting that includes a short section of stem with a leaf attached Stem is treated with rooting hormone and inserted into the growing medium with the lateral bud just below the medium surface New plant will develop from the lateral bud

Root Cutting A cutting made from sections of roots

Separation Some plants produce vegetative plant structures that can be removed intact from the parent plant. Removal and planting of these vegetative structures is separation.

Division Involves separation of a plant into two or more pieces, each containing a portion of the roots and crown The plant roots or the entire plant may be cut into sections to make two or more plants from the original plant.

Layering Roots form on the stem of the plant while it is still attached to the parent plant Parent plan supports the new plant during root development Once the new plant can function on its own, it is removed from the parent.

Air layering Stem is girdled, the cut is dusted in rooting hormones, and the dusted cut is covered in moss

Types of Layering Simple layering Trench layering Mound layering Air layering

Grafting Implanting a branch or bud from one plant onto another

Tissue Culture Plant reproduction using very small, actively growing plant parts under sterile conditions and medium Cloning- genetically engineering offspring from nonsexual tissue