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    Root hair

    • Last Update: 2020-11-06
    • Source: Internet
    • Author: User
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    on the tip of the tip of the tip of the hair, for some of the skin cells protruding outward formed, the top closed tyche structure, about 0.5 to 10 mm long. The number of root hair is very large, set in a certain area of the root tip, forming the root hair area, is the main part of absorbing water and inorganic salt. The wall of the root hair cell is very thin, the cytoste is close to the cell wall, the center is a large liquid bubble, the nuclei gradually move to its end with the growth of the root hair. Root hair is very sensitive to changes in humidity, in a humid environment, the number of root hair is very large, per square millimeter of skin, corn about 420, peas about 230. In the case of flooding, there is very little root hair. In dry soil, root hair does not develop. Root hair life is very short, can only live for a few days, generally not more than 2 to 3 weeks, that is, withering off. With the growth of the root tip, the elongation area of the cell extends back, in the new part, and produces a new root hair, therefore, at the root tip always maintain a relatively stable root hair area. The presence of root hair increases the absorption area of the root. Root hair can secrete a variety of substances, such as
    organic
    acid, so that the soil difficult to dissolve the salt dissolved, become easy to be absorbed by plant nutrients.
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