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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It is similar to the tunica-corpus theory of the shoot apex.
In Korper-Kappe theory
Thus the planes of the two divisions form a T in a median longitudinal section of the root. Anticlinal division theoryy the characteristic of tunica whereas corpus exhibits both anticlinal and periclinal division. The kap;e between korper and kappe, and between tunica and corpus are not always sharply demarcated. The theory says that the cells in the root apex lorper in a pattern called T-divisions. Though histogen theory is abandoned to explain shoot apex, Eames and MacDaniels illustrated the root apical meristem on the basis of histogen concept.
For that reason the root apex shows no change in morphology. In Zea mays monocot dermatogen generates root cap only and this histogen is referred to as calyptrogen.
In other words all tissues that compose a mature root including root cap are the derivatives of a theody apical cell. The body-cap concept and tunica-corpus concept both are based solely on the planes of cell division. A single apical cell is present only in vascular cryptogams, e.
The two cells thus formed one has the capability of cell division. One of the layers gives rise to the stele and the other to the cortex and root cap.
In Korper-Kappe theory
It consists of conspicuous longitudinal files of cells. The second type is very rare and found in Allium sativum, Aloe vera, Amaryllis, Eucharis etc. Here’s how it works: The lower korpr cell then divides longitudinally, i.
Ontogeny of Stoma in Plants Plants. The epidermis arises from the outermost layer of the cortex. The central part of root cap is the columella where the cells are arranged in longitudinal files. The outer region of the root apex is the Kappe. Answer Now and help others. Tueory divisions are described as T-divisions. Apical Cell Theory korpsr. It divides longitudinally and the two daughter cells thus formed have the potentiality of cell division.
According to Hanstein root apical meristem consists of three cell-initiating regions called histogens Fig.
This theory attributes specific destinies to the derivatives of the three histogens. This type is found in majority of dicotyledonous plants. It is based on differences in the planes of cell division.
The other three sides donate cells to form epidermis, cortex and vascular cylinder.
The cells of this region divide first horizontally. It is the T-division that characterizes korper and kappe. In this type, three groups of initials are found at the apex — outer dermatogenmiddle periblemand inner plerome.
The first type is found in Zephyranthes sp. In this type there is a single row of initials which, ultimately, gives rise to various zones of rheory root including the root cap. Korpe two cells thus formed have the capability of cell division.
The daughter cell that faces the root apex inherits the initial function. Korper and kappe-these two zones of root are delimited by planes of cell division. Equisetum, Adiantum and Polypodium etc.
Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top. This is a question and answer forum for students, teachers and general korrper for exchanging articles, answers and notes.
In Brassica dicot dermatogen generates both protoderm and root cap and this histogen is referred to as dermatocalyptrogen. Megasporogenesis and Megagametogenesis in Plants Embryology Biology. The theory was put forward by Schuepp The apical initial is tetrahedral in shape and generates root cap from one side.
Anybody can ask a question Anybody can answer The best answers are voted up and thepry to the top. The daughter cell that faces the base oorper root, i. This cell divides longitudinally and both the daughter cells inherit the property of cell division. During growth the root changes in diameter. Composition of Sporopollenin in Spores and Pollen Plants. This happens due to cell divisions that occur in such a way that a single longitudinal file of cells becomes double files. The daughter cells divide by transverse partitions followed by longitudinal partitions.
In root with dermatocalyptrogen the cap extends into protoderm. This occurs in downwardly pointed roots. In this region the T is inverted, i.
In the kappe the initial cell first divides transversely and forms two cells. 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 theoru to planes of cell division in its parts.