Parasitic plant stem,light micrograph

Bildnummer 11675216
Parasitic plant stem,light micrograph
Parasitic plant stem. Light micrograph of a section through the stem of a stinging nettle (Urtica dioica) that has been entwined by the stem of a greater dodder (Cuscuta europaea) parasitic plant. Here the parasite's haustoria have penetrated the stinging nettle's tissues. The vascular tissue in each haustorium penetrates the host's vascular bundles where it 'sucks' sugars from the phloem (brown,oval) tissues,and water and minerals from the xylem (brown with white circles,violet),which it passes back to the stem of the host. The parasite also produces on its epidermis large adhesive cells that stick to the host's stem. The parasitic dodder has little or no chlorophyll,so cannot make its own food,and the base of the stem lacks roots so cannot absorb
Lizenzart: Lizenzpflichtig
Credit: Science Photo Library / Wheeler, Dr. Keith
Bildgröße: 4571 px × 4217 px
Modell-Rechte: nicht erforderlich
Eigentums-Rechte: nicht erforderlich
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