With respect to these the histogen theory fails. Korper-Kappe Theory The Korper-Kappe theory of root apical organization proposed by Schuepp (, ). Meristems, Tissues, Shoot apex, Root apex, Apical Cell Theory, Shoot. Apical Meristem Histogen Theory, Korper-Kappe Theory, Mantle-Core Theory, Tunica. Plant Anatomy Theories Different theories about plant anatomy and different types of cells playing important role in proper functioning of plant.

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When such division continues it is observed that a single rowed region is left behind over the double-rowed region. The body-cap concept and tunica-corpus concept both are based solely on the planes of cell division.

Top 3 Theories of Root Apical Meristem in Plants | Botany

This theory attributes specific destinies to the derivatives of the three histogens. The lower daughter cell then divides longitudinally, i. Apical Cell Theory 2. This occurs in downwardly pointed roots.

The following points highlight the top three theories of root apical meristem in plants. It consists of conspicuous longitudinal files of cells. This theory was proposed by Nageli who drew the attention to the occurrence of a single apical cell or apical initial that composes the root meristem. In other akppe all tissues that compose a mature root including root cap are the derivatives of a single apical cell.

The histogens are called dermatogen, periblem and plerome that respectfully form epidermis, cortex and vascular cylinder that are present in a mature root.

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Korper and kappe-these two zones of root are delimited by planes of cell division. A single apical cell is present only in vascular cryptogams, e.

Top 3 Theories of Root Apical Meristem in Plants | Botany

The other three sides donate cells to form epidermis, cortex and vascular cylinder. Here’s how it works: These cells seldom divide. This theory of root meristem was proposed in by Schiiepp who regarded the occurrence of two systems of cell seriation that characterize the root apex with reference to planes of cell division in its parts. The body-cap concept is illustrated below on analyzing the divisions in the derivatives of apical cell Fig.

In Zea mays monocot dermatogen generates root cap only and this histogen is referred to as calyptrogen. This type of division has been found among the members of Gramineae and Fagaceae. In the korper the initial cell first divides by transverse partition and forms two cells.

It is based on differences in the planes of cell division. In this type, three groups of initials are found at the apex — outer dermatogenmiddle periblemand inner plerome. Answer Now and help others.

For that reason the root apex shows no change in morphology. The daughter cells are parallel in arrangement, share a common wall and divide by transverse partition followed by longitudinal partition in one cell. During growth the root changes in diameter. The outer region of the root apex is the Kappe. In Brassica dicot dermatogen generates both protoderm and root cap and this histogen is referred to as dermatocalyptrogen.


The third type is found in Haemanthus coccineus. The apical initial is tetrahedral in shape and generates root cap from one side. This type is found in majority of dicotyledonous plants. This happens due to cell divisions that occur in such a way that a single longitudinal file of cells becomes double files. It is similar to the tunica-corpus theory of the shoot apex.

The korper-kappe theory of root apex is comparable with tunica-corpus theory of shoot apex. The initial cell divides transversely. The zones exhibit clear boundary when they originate from separate initials, e.

Though tgeory theory is abandoned to explain shoot apex, Eames and MacDaniels illustrated the root apical meristem on the basis of histogen concept.

What modification is needed in the statement? Hanstein in advocated the theory. The two cells thus formed one has the capability of cell division. The two cells thus formed have the capability of cell division. It divides longitudinally and the two daughter cells thus formed have the potentiality of cell division. Such divisions are described as T-divisions.

The boundaries between korper and kappe, and between tunica and corpus are not always sharply demarcated. Yheory this type, generally two rows of initials are observed at the apex. The epidermis arises from the outermost layer of the cortex.