Primary Vascular Tissue System in Stems

The primary vascular bundles of Vitis are collateral, meaning that phloem only occurs on one side of the xylem. Primary xylem transports water and nutrients. Its component cells include vessel elements, and fibers. Primary phloem transports photosynthates and is composed of sieve tube members, companion cells, parenchyma cells, and primary phloic fibers.

Primary Vascular Bundle XS

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