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The root apical organization is essential for the proper development and functioning of plant roots. Several theories have been proposed to explain how the root apex is organized and how the cells within it differentiate to form various root tissues. These theories are primarily based on the observations of the organization and growth patterns of root apical meristems (RAMs) in different plant species. The key theories that explain root apical organization include the Histogen Theory, the Quiescent Center Theory, the Cell Family Theory, and the Tunica-Corpus Theory. The Histogen Theory, proposed by Haberlandt in 1887, is one of the oldest concepts. According to this theory, the root apical meristem is divided into three primary regions or histogens: the dermatogen, the periblem, and the plerome. The dermatogen gives rise to the epidermis, the outermost layer of cells in the root. The ___ _______ _____ ____ _______ ______ __________ _____ ____.
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