Development of the storage organ of Brassica campestris L. Public Deposited

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  • Developmental changes in the storage organ of Brassica campestris L. were followed from the organization of the embryonic radicle and hypocotyl to the mature storage organ. Three independent primary meristems gave rise to the cortex, the stele, and the root cap-epidermis. The primary development is typical of the Cruciferae. Cambial activity was followed through serial tangential sections of the phloem from four areas of the storage organ; the crown, the hypocotyl, the upper root and the middle root. The anticlinal divisions of the crown's cambium were primarily longitudinal and transverse. The divisions in the hypocotyl, although greatly oblique had fewer 'longitudinal divisions. The cambium of the upper root had fewer longitudinal and greatly oblique anticlinal divisions. The anticlinal divisions of the middle root showed few greatly oblique divisions with most divisions being oblique to slightly oblique. New ray initials originated by transverse divisions of fusiform initials. Both ray and fusiform initials that were lost differentiated into parenchyma cells. Decline of fusiform initials was rare and in no case did ray initials originate in this fashion. As the storage organ expanded, interxylary phloem strands and vascular bundles appeared. Phloem strands differentiated following longitudinal divisions of the axial xylem parenchyma. As the organ enlarged, parenchyma cells surrounding the phloem strand divided, a cambium was formed, and tertiary phloem and xylem were produced. These interxylary vascular bundles formed a network which in the upper hypocotyl united to form a continuous band between the xylem and the pith. In the crown the vascular bundles of the basal leaves are bicolateral and the internal phloem is continuous with that of the interxylary phloem.
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