Nettle leaf stalk structures, LM
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Nettle leaf stalk structures, LM
Nettle leaf stalk structures. Polarised light micrograph (LM) of a nettle leaf (Urtica dioica), which has been boiled up with dilute sodium hydroxide to separate the cells, washed in water and stained with blue ink. The long tubes that carry water and minerals up the stem can be seen in blue and the lignin thickenings that strengthen the tubes show up mainly in black, in different annular (rings), spiral and scalariform ladder-like) formations. Lignin is a complex chemical compound and is hydrophobic (repelled from a mass of water). As well as providing structural support, the hydrophobicity of lignin also means that the plants vascular tissue is able to conduct water efficiently
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Media ID 6290909
© DR KEITH WHEELER/SCIENCE PHOTO LIBRARY
Annular Compound Compounds Hydrophobic Lignin Nettle Plant Biology Polarised Polarized Ring Rings Spiral Spiralling Stalk Stem Structures Support Thickening Tissue Tissues Tube Tubes Urtica Dioica Vascular Vessel Vessels Xylem Bio Chemistry Biochemical Light Micrograph Light Microscope Section Sectioned
EDITORS COMMENTS
This print showcases the intricate structures found in nettle leaf stalks, captured under polarised light microscopy. By subjecting the nettle leaf to a process involving dilute sodium hydroxide, cell separation, water washing, and staining with blue ink, the hidden wonders of its vascular tissue are revealed. The long tubes responsible for transporting water and minerals up the stem are beautifully highlighted in shades of blue. Meanwhile, the lignin thickenings that provide strength to these tubes appear predominantly black and exhibit various formations such as annular rings, spirals, and scalariform ladder-like patterns. Lignin is an extraordinary compound known for its complexity and hydrophobic nature – it repels water. Apart from offering structural support to plants like nettles, this unique property allows efficient water conduction within their vascular tissue. This mesmerizing image not only emphasizes the importance of structure and support in plant biology but also provides a glimpse into the fascinating world of botanical chemistry. With its meticulous details and vibrant colors brought forth by polarised light microscopy techniques, this photograph invites viewers to appreciate both the beauty and functionality present within natural systems. It serves as a testament to how scientific exploration can unravel hidden marvels lurking beneath our everyday surroundings – reminding us once again of nature's awe-inspiring complexity.
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