J.C. REVY, ISM / SCIENCE PHOTO LIBRARY J.C. REVY, ISM / SCIENCE PHOTO LIBRARY
Plant stem sieve plates. Coloured scanning electron micrograph (SEM) of a transverse section through a plant stem, showing sieve plates in the phloem. Phloem is the part of a plant's vascular system responsible for the transport of organic food matter from the leaves downwards to the roots. The sieve plates are the dividing barriers between sieve tubes, sections of phloem adapted purely for the translocation of nutrients around the plant. The sieve plates are surrounded by narrower tubes. The narrower tubes are phloem parenchyma which have a structural rather than vascular role. Magnification: x800 at 6x7cm size.
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