Dyer's greenweed stem, light micrograph

Dyer's greenweed stem, light micrograph

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Credit: DR KEITH WHEELER/SCIENCE PHOTO LIBRARY

Caption: Dyer's greenweed stem. Polarised light micrograph of a transverse section through the stem of a dyer's greenweed (Genista tinctoria) plant. This stem has eight ribs with deep grooves with hairs, which reduce water loss through transpiration. Under the thick-walled epidermis (outer layer) with thick cuticle are layers of palisade-like cells (red-brown) containing chloroplasts (chlorenchyma) for photosynthesis. The vascular cylinder is made up of (from outside inwards) a ring of phloem sieve tubes (red black alternating patches), a ring of cambium (brown black), and xylem (blue white). In the centre of the stem is the pith made up of large celled parenchyma tissue (white-blue). Magnification: x103 when printed 10 centimetres wide.

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Keywords: angiosperm, angiosperms, biological, biology, botanical, botany, cambium, cell, cell biology, cells, chlorenchyma, cut out, cut outs, cut-out, cut-outs, cuticle, cutout, cutouts, cytology, dyer's greenweed, epidermis, flora, genista tinctoria, light micrograph, light microscope, lm, nature, palisade mesophyll, parenchyma, phloem, pith, plant, plant structure, polarised light, section, sectioned, sieve tube, stem, support, supportive, tubes, vascular bundle, white background, xerophyte, xerophytic, xylem

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