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 layeringAsexual propagationCloningCrownCuttingDisinfectantDivisionGirdlingGrafting

Growth regulatorLayering Leaf bud cuttingRoot cuttingStem cuttingStock plantTissue culturevegetative

Terms

Crown- part of the plant that enters the soilDisinfectant- a material that destroys

infective agents such as bacteria and virusesGirdling- wounding; restricts the function of

the xylem or phloem of a dicot plantGrowth regulator- a substance that

influences plant growth

Asexual Propagation

Process of reproducing plants without seedsUses the leaves, buds, stems, and roots of

plants to produce new plantsAlso 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 layeringTrench layeringMound layeringAir 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