Ribes stem, LM

Ribes stem. Light micrograph (LM) of a young stem. Ribes is a genus of about 200 known species of flowering plants. The various species are known as currants or gooseberries, and some are cultivated for their edible fruit or as ornamental plants. Ribes have a dicot stem vascular arrangement. Vascular tissues transport water and dissolved substances inside the plant and helps support the stem. The two types of vascular tissue are xylem and phloem. Xylem carries water and dissolved ions from the roots to stems and leaves. Phloem carries dissolved sugars from the leaves to all other parts of the plant. Xylem has two kinds of conducting cells, tracheids and vessel elements. Ground tissue of the stem (called pith and cortex) develops support cells to hold the young plant upright. The dicot stem has a distinct ring of vascular bundles. Magnification: x10 at 10 cms. wide., Photo by STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY