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The Differences Between a Taproot and Fibrous Root System

Taproots and fibrous roots are the two main broad categories of roots of plants that grow on land. Gardenerdy provides the key differences between them.

Home / General Gardening / The Differences Between a Taproot and Fibrous Root System
Differences Between Taproot and Fibrous Root System

Taproots and fibrous roots are the two main broad categories of roots of plants that grow on land. Gardenerdy provides the key differences between them.

Did You Know?

Carrots, radishes, beetroot, turnips are edible taproots, while sweet potatoes are the edible part of a fibrous root.

Plants that grow on land, i.e., vascular plants, typically have roots that grow downwards into the Earth. However, some plants also have aerial roots. A root unlike a branch or stem does not bear any leaves or nodes.

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Roots are characterized by the functions they perform for the plant. The functions of a root are:

● Absorption: Roots absorb water and also nutrients from the soil.
● Transmission: They transport water and nutrients absorbed by them to the plant.
● Anchorage: They enable the plant to stand firmly on the ground and grow upwards by acting as an anchor and holding it.
● Storage: They store food and nutrients in them. These are used up by the plant for its growth as and when needed. E.g. carrots, radishes, sweet potato, etc.
● Reproduction: Roots also participate in vegetative reproduction.

Roots are mainly classified into taproots and fibrous roots (adventitious roots).

Taproots

A taproot is a kind of root system that is characterized by the presence of a dominant central root, from which other smaller-sized lateral roots emanate horizontally.

Based on shape, taproots are classified as:

heap of Carrots

✦ Conical root: As the name suggests, it is in the shape of a cone. It is circularly wide at the top and gradually narrows down to a point at the bottom. Carrot is an example of a conical root.

Radish with leaf

✦ Fusiform root: This kind of root tapers off at each end, being the widest in the middle. Radish is an example of a fusiform root.

Turnips on table

✦ Napiform Root: This kind of root is round at the top and sharply tapers to a point below. Turnip is an example of a napiform root.

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In many plants, taproots also act as organs for storing food, water, and nutrients.

Fibrous Roots

One basic way to identify fibrous roots is the absence of a taproot. Instead in this root system, a mass of many similar-sized roots are seen spreading out from the base of the stem. They are of 3 types:

Orchid and root

✦ Aerial roots: These kinds of adventitious roots remain suspended in the air and do not penetrate into the Earth. Usually the epiphytes (plants that derive moisture and nutrients from the air and rain; usually grows on another plant but not parasitic on it) that are monocots from the arum, gabi, and orchid family have aerial roots. They provide nutrition to the plant by photosynthesis, retain water, and also provide anchorage to the plant.

Corn root

✦ Prop Roots: Prop roots are those that have finally reached inside the ground, starting from the stem. They help in providing stronger anchorage to the plant or tree. In some plants, they can also perform photosynthesis. Such kind of roots are found in corn and banyan.

Tuber of lily

✦ Contractile Roots: These roots are commonly found in a bulbous plant, which is a plant growing from a bulb; for example: lily. They originate from the base of a stem of a bulb or corm. The function of these roots is to vertically contract a newly grown bulb or corm which is at a higher level than its older counterparts to a desirable level.

Differences Between Taproot and Fibrous Root System

Taproots Fibrous Roots
Appearance
There is a central primary dominant taproot (also known as the radicle) that grows downward; other hairy roots (known as lateral roots) branch out from it sideways. The roots branch out from the stem, and there is no central root. They form a cluster of roots of more or less the same size.
On germination
Upon the germination of a seed, the first root that emerges from it is called the radicle or primary root. This radicle then forms the taproot. Upon the germination of a seed, the first root, i.e., the radicle, does not last long and is replaced by adventitious roots.
Depth of penetration
They grow deep underground. They do not grow so deep underground; they grow close to the surface of the ground.
Conduction of water
Since they penetrate deep into the soil, they can reach the underground reserves of water. They are, thus, more efficient in transporting water to the plant in times of drought, (when water is not available on the surface). Because they grow close to the surface, and do not penetrate deeply into the soil, the plant is more vulnerable in times of drought. However, they can transport nutrients from fertilizers more efficiently.
Prevention of soil erosion
They are not so effective in the prevention of soil erosion as compared to fibrous roots. They are very effective in the prevention of soil erosion. The dense network of these fibrous roots prevents the top layer of soil from getting washed away by water and blown away by the wind. To prevent soil erosion, plants with fibrous roots are purposefully planted.
Anchorage
The taproot enables them to anchor very well into the soil. This makes it very difficult to uproot the plant. They do not anchor very well to the soil, and it is comparatively easier to uproot the plant.
Growth requirements
For plants with a taproot system to grow well, we need to harrow and loosen the soil. This will encourage the downward growth of the taproot. For plants with a fibrous root system to grow well, we need to provide them with artificial irrigation. We should also mulch the soil by adding compost.
Found in
They are generally found in dicotyledonous plants. They are generally found in monocotyledonous plants.
Examples
Conifers, carrots, dandelions, poison ivy, annual flowers, radishes, and beetroot have taproots. Onions, tomatoes, lettuce grasses, lilies, palms, corn, beans, peas, sweet potatoes, rice, and wheat have fibrous roots.

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