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Introduction
• The plants can be propagated by specialized structures like
Suckers, Bulb, Corms, Tubers, Rhizomes in a short duration.
• Propagation by these underground structures is an essential
method of vegetative reproduction in horticultural nursery
business
Types of Specialized Structures:• Suckers- eg. Banana
• Bulbs- eg. Onion
• Corms- eg. Gladiolus
• Tubers- eg. Potato
• Rhizomes- eg. Ginger
Suckers:• Sucker is a lateral branch developing
from underground parts of the stem or
roots.
• Suckers arise from below the surface
of soil.
• The tendency of suckering is
possessed only by a few plants.
• Banana develops 2 types of suckers,
the sword suckers and water suckers.
• Sword Suckers are used for
propagation of banana. Water and Sword Suckers of Banana
Bulbs:
• Bulbs are produced by
monocotyledonous plants.
• A bulb is a specialized underground
organ with a short, fleshy, apical
growing point enclosed by thick fleshy
scales.
• The outer scales are generally fleshy
& contain reserve food materials.
• Onion, Bulbous Iris.
Onion, Bulb
Iris Bulb
Corms:
• Corm is the swollen base of a stem whose axis is enclosed by dry,
scale like leaves.
• A corm is stem structure with nodes & internodes.
• The bulk of corm consist of food reserves.
Gladiolus Corms
Potato Tubers
• Tuber is the short terminal
portion of an underground
stem.
• Food accumulates in the form
of starch in a tuber which
results in thickening.
• It develops buds which produce
new plants on onset of
favorable conditions
Tubers:
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