BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY
Plant phloem tissue. Light micrograph of a longitudinal section through tissue from a sunflower (Helianthus) plant, showing sieve tubes (horizontal structures) and sieve plates (red areas) in phloem tissue. Phloem is the part of a plant's vascular system responsible for the transport of sugars and other nutrients from the leaves to the roots. The sieve plates are the dividing barriers between sieve tubes, sections of phloem adapted to move nutrients around the plant. Magnification: x145 when printed at 10 centimetres across.
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