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all secondary roots that grow from the main root. The side root is formed by the
of the
, so it is called the internal origin. In seed plants, side roots are generally formed from cells of the mid-pillars adjacent to the primary woody part. The formation of the side root does not begin at the growth point of the main root, but at its mature part. The middle column of the side root is connected with the middle column of the main root, and water and nutrients can flow to each other through catheters and sieve tubes. Usually the main root has a certain inhibitory effect on the growth of the side root, especially near the root end is more obvious. If the root end of the main root is cut, the side root grows rapidly. In horticulture and vegetable cultivation, seedling transfer is often used to cut off the main roots that extend below the tillage layer, prompting a large number of side roots to occur in order to absorb more water and nutrients at the soil surface.
