Anatomy of the Primary Axis of Solanum melongena

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Abstract
The stele of the primary root of the eggplant is a diarch, radial protostele. Root-stem transition begins very low in the hypocotyl. The beginning of the change from the exarch to the endarch condition is a breaking up of the diarch xylem plate and the 2 primary phloem groups, forming 2 units of the primary xylem and phloem. At a higher level there is a bifurcation of the metaxylem and an inward differentiation of 2 of the phloem groups, the latter becoming the internal phloem. Near the cotyledonary plate there is a separation of the 2 double bundles formed by the breaking of the original diarch xylem plate. One of these vascular units becomes the vascular trace of one of the cotyledons, and the second unit, that of the other. In the petioles and midribs of the cotyledons the change from the exarch to the endarch condition is gradually accomplished. The protoxylem differentiates adaxially and the metaxylem abaxially until the endarch condition is fully established. The foliar traces in the first internode are completely endarch, and differentiate against the vascular elements of the hypocotyl slightly below the cotyledonary plate.

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