An Overview
The rhizome and tuber are the modified stems which store food.
What is rhizome?
Rhizomes are horizontal underground stems with non-green, fleshy, distinct nodes and internodes. These are brownish in colour and are auxiliary as well as apical buds. They contain terminal buds and run parallel to the ground
The common types of rhizomes are Alocasia indica, ginger and banana.
Rhizomes are also called root stalks, which usually grow perpendicular to the direction of the force of gravity, i.e. they grow horizontal. The rhizome rootstock grows vertically upwards instead of horizontal.
Also Read: Modifications of Root
What is tuber?
The tuber is a fleshy part of the plant which stores food. Potato is the most common tuber largely used as food. The lower part of the potato gets covered by the earth where the adventitious branches grow. The tuber is covered with a number of depressions called “eye” and each eye represents a node.
Also Read: Modifications of Stem
Let’s learn some more differences between rhizome and tuber.
Rhizome and Tuber- Differences
|
|
|
|
|
|
|
Grows horizontally inside the soil |
Has fleshy roots |
|
|
|
|
Rhizomes are thickened underground stems. |
Tubers are modified stems with starchy interiors |
|
|
|
|
Nodes bear adventitious roots |
Nodes do not bear roots |
|
|
|
|
Rhizomes grow horizontally. |
Tubers do not have a well-organized growing habit. |
|
|
|
|
Rhizomes are pear-shaped. |
Tubers do not have a standard shape. |
|
|
|
|
The nodes of a tuber develop into roots and shoots. |
The nodes of a tuber develop into both roots and stems. |
|
|
|
|
Smaller in size compared to tubers |
Larger in size than rhizomes. |
|
|
|
|
It is the underground stem. |
It is the underground branches of the stem or underground root. |
|
|
|
|
Rhizomes are low in starch content. |
Tubers are high in starch content. |
|
|
|
|
Predominant classification cannot be found in Rhizomes. |
There are two types of tubers-stem and root tubers. |
|
|
|
|
Rhizomes produce an offspring. |
Tubers grow in size every year. |
|
|
|
|
Asparagus, Bamboo, Chinese lantern, ginger, Lotus, the Venus Flytrap, Western poison-oak, turmeric, etc. |
Anemones, begonia, carrot, cassava, dahlia, oxalis, potato, sweet potatoes, Tuberous, yams, etc. |
Also Refer: Difference between Corm and Bulb
This concludes some of the basic differences between rhizome and tuber. Stay tuned with BYJU’S Biology for more differences and other Biology related topics.
