Helianthus stem, LM

Numéro d’image : 13445214
Helianthus stem, LM
Helianthus stem. Light micrograph (LM). Helianthus is a genus comprising about 70 species of annual and perennial flowering plants in the daisy family Asteraceae. Helianthus has 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.
Licence : Droits gérés
Crédit: Science Photo Library / Gschmeissner, Steve
Taille de l’image : 4422 px × 4572 px
Model Release : Non requis
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