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The tap root can be persistent throughout the life of the plant but is most often replaced later in the plant's development by a fibrous root system. [2] [3] A persistent taproot system forms when the radicle keeps growing and smaller lateral roots form along the taproot. The shape of taproots can vary but the typical shapes include:
Welwitschia has an elongated shallow root system consisting of "a tapering taproot with one or more non-tapering extensions, some pronounced lateral roots, and a network of delicate spongy roots" [14] and a woody fibrous unbranched main stem. [12] The roots extend to a depth roughly equal to the span of the living leaves from tip to tip. [12]
Replacement of a tap root system by a fibrous root is seen in onions, tuberose (Polyanthes tuberosa), grasses, etc. Fibrous roots from normal-stem nodes are seen in grasses like maize, sugarcane, bamboo, etc. Fibrous roots from nodes help in the survival of the plant and thus in vegetative reproduction, when the plant's base is damaged or cut ...
Aerial roots: Instead of having tap roots deep underground, Rhizophoreae develop roots that branch out from the stem some distance above the soil surface. [10] Underground roots, like all plant tissues, require oxygen for respiration. [ 10 ]
Rooting Habit, "Tap Root in proportion like a carrot". A seedling tree grows many times in root length to its growth upward in height. The Kentucky coffee tree is not commonly offered in the nursery trade because the taproot makes the tree somewhat difficult to transplant. Being in the Legume family the roots fix nitrogen in the soil. [13] [14]
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A true root system consists of a primary root and secondary roots (or lateral roots). the diffuse root system: the primary root is not dominant; the whole root system is fibrous and branches in all directions. Most common in monocots. The main function of the fibrous root is to anchor the plant.
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