Summary
Highlights
Vegetative propagation is asexual reproduction in plants, involving only one parent and no gametes. It can occur naturally or through artificial methods.
Examples of natural vegetative propagation through stems include strawberry runners, which produce genetically identical daughter plants, and potato stem tubers, which are swollen underground stems with 'eyes' or lateral buds that grow into new plants.
The 'mother of thousands' plant uses its leaves to produce plantlets along the edges, which drop off and grow. Dahlia plants use root tubers, swollen roots with food reserves and lateral buds at the stem's base, to form new plants.
The onion bulb is a modified bud with a reduced stem, lateral buds, and fleshy leaves for food storage. These lateral buds have the potential to grow into new onion plants.
Artificial methods include cuttings, where a piece of a plant is rooted to grow a new, identical plant, and layering, where a branch is buried to encourage root growth before being separated from the parent plant.
Grafting involves combining two plants with desirable traits: a scion (shoot system) and a stock (root system). The vascular cambium of both must be aligned for successful fusion, as seen in the 'tree of 40 fruits' example.
Micropropagation is tissue culturing, where a small piece of tissue is grown in a sterile medium to form a callus. This callus is then treated with growth regulators to develop roots and shoots, producing many identical seedlings.
Advantages include faster reproduction, genetically identical offspring (clones) with desirable traits, and high reliability. Disadvantages are the lack of genetic variation and the absence of a seed bank.