Sage stem, light micrograph
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Sage stem, light micrograph
Sage stem. Light micrograph of a section through a primary stem of a scarlet sage (Salivia splendens) plant. The outer stem is covered with a thin epidermis (green) that contains stomata. Under the epidermis, at the corners, is a layer of flexible collenchyma (blue-red) for support. The cortex is made up of parenchyma cells (round, red). Next are four large and twelve small vascular bundles. Each has an thin outer layer of phloem (green) with sieve plates and companion cells, and an inner xylem (red), with large vessels and small-celled woody parenchyma tissue (green). In-between is a thin layer of cambium. The centre of the stem is a pith of parenchyma (green), most of which has broken, leaving a hollow. Magnification: x5 when printed 10 centimetres
Science Photo Library features Science and Medical images including photos and illustrations
Media ID 6338873
© DR KEITH WHEELER/SCIENCE PHOTO LIBRARY
Bundles Cambium Cell Biology Collenchyma Companion Cells Cortex Cytological Cytology Dicot Dicots Dicotyledon Dicotyledons Epidermis Histological Histology Hollow Microscopy Parenchyma Tissue Phloem Pith Sage Sieve Plate Stain Stained Stomata Structural Structures Tissue Vascular Bundle Vascular Tissue Vessel Vessels Xylem Cells Light Micrograph Light Microscope Scarlet Sage Section Sectioned
EDITORS COMMENTS
This print showcases the intricate structure of a sage stem, providing a fascinating glimpse into the world of plant biology. The image, captured using a light microscope, reveals various components that make up this primary stem of a scarlet sage (Salvia splendens) plant. Starting from the outer layer, we can observe a thin epidermis in vibrant green color, which acts as protection for the stem and contains stomata - tiny openings crucial for gas exchange. Just beneath it lies a layer of flexible collenchyma cells in shades of blue-red, providing support to the stem. Moving further inward, we encounter the cortex composed of round parenchyma cells in striking red hues. This region serves multiple functions within the plant's anatomy. Surrounding these parenchyma cells are four large and twelve small vascular bundles responsible for transporting water and nutrients throughout the stem. Each vascular bundle exhibits an outer layer called phloem colored in green. It consists of sieve plates and companion cells essential for nutrient transport. Inner to phloem is xylem tissue depicted in red tones containing large vessels alongside small-celled woody parenchyma tissue highlighted in green. A thin cambium layer separates these two vital tissues while contributing to growth and development processes. Towards the center lies a pith composed mainly of parenchyma cells shown in vibrant green; however, most have broken away leaving behind an intriguing hollow space. This detailed micrograph offers valuable insights into angiosperm histology by showcasing cellular structures such as stomata, vessels, collenchyma layers, and more within dicotyledonous plants like scarlet sage (Salvia splendens).
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