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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One of the layers gives rise to the stele and the other to the cortex and root cap. During growth the root changes in diameter.
The central part of root cap is the columella where the cells are arranged in longitudinal files. The cells of this region divide first horizontally. The root meristem exhibits multicellular structure. It is the T-division that characterizes korper and kappe. In the korper the initial cell first divides by transverse partition and forms two cells.
The Korper-Kappe Theory of Root Apex | Essay | Botany
The epidermis arises from the outermost layer of the cortex. This theory of root meristem was proposed in by Schiiepp who regarded the occurrence of two systems theroy cell seriation that characterize the root apex with reference to planes of cell division in its parts. The daughter cells divide by transverse partitions followed by longitudinal partitions. The zones exhibit clear boundary when they originate from separate initials, e.
The lower daughter cell then divides longitudinally, i. It divides longitudinally and the two daughter cells thus formed have the potentiality of cell division.
Answer Now and help others. The root apex forms no branches, and no lateral structures like the leaves. Equisetum, Adiantum and Polypodium etc. Histogen theory explains both root and shoot apical meristem. The two cells thus formed have the capability of cell division. Such divisions are described as T-divisions.
The following points highlight the top three theories of root apical meristem in plants. Composition of Sporopollenin in Spores and Pollen Plants. The boundaries between korper and kappe, and between tunica and corpus are not always sharply demarcated. Thus the planes of the two divisions form a T in a median longitudinal section of the root. The apical initial is tetrahedral in shape and generates root cap from one side.
Anticlinal division is the characteristic of tunica whereas corpus exhibits both anticlinal and periclinal division.
In Korper-Kappe theory
The theory was put forward by Schuepp For that reason the root apex shows no change in morphology. In certain members of the families Juglandaceae, Rosaceae, Leguminosae, Tiliaceae etc. In other words all tissues that compose a mature root including root cap are the derivatives of a single apical cell. In the fourth additional type, there are four rows of initials giving rise to the root cap, the epidermis, the cortex and the stele, independently.
This theory attributes specific destinies to the derivatives of the three histogens. Megasporogenesis and Megagametogenesis in Plants Embryology Biology.
In Korper-Kappe theory
The third type is found in Haemanthus coccineus. In the kappe the initial cell first divides transversely and forms two cells. A single apical cell is present only in vascular cryptogams, e. According to Hanstein root apical meristem consists of three cell-initiating regions called histogens Fig. The body-cap concept and tunica-corpus concept both are based solely korpeg the planes of cell division. The inner region of the apex is the korper. Though histogen theory is abandoned to explain shoot apex, Eames and MacDaniels illustrated the root apical meristem on the basis of histogen concept.
The two cells thus formed one has the capability of cell division.
The theory says that the cells in the root apex divide in a pattern called T-divisions. In this type, generally two rows of initials are observed at theoryy apex.