Abnormal thistle stem, light micrograph
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Abnormal thistle stem, light micrograph
Abnormal thistle stem. Light micrograph of a normal (top) and abnormal (bottom) stem of the perennial sow thistle (Sonchus arvensis). The abnormal stem has grown in a flattened, or fasciated, manner. This is thought to be due to injury or infection to the stem meristem (the actively growing tissue), which causes a row of proto-stems to form and then fuse together to form the flattened structure seen here
Science Photo Library features Science and Medical images including photos and illustrations
Media ID 6290939
© DR KEITH WHEELER/SCIENCE PHOTO LIBRARY
Comparing Comparison Cross Section Deformed Deformity Flattened Fused Meristem Microscopy Phloem Stem Teratology Transverse Vascular Bundle Vessels Xylem Abnormal Fasciated Light Micrograph Light Microscope Monstrosity Section Sectioned Sonchus Arvensis
EDITORS COMMENTS
This print showcases the intriguing world of plant abnormalities. In this light micrograph, we are presented with a fascinating comparison between a normal and abnormal stem of the perennial sow thistle (Sonchus arvensis). The top image displays the expected structure of a healthy stem, while the bottom image reveals an extraordinary deformity known as fasciation. The abnormal stem has grown in a flattened manner, resembling a duo of fused proto-stems. This peculiar growth pattern is believed to be caused by injury or infection to the actively growing tissue called meristem. As a result, these row-like structures merge together, forming the strikingly flattened shape captured here. Examining this cross-sectioned view allows us to delve into the intricate anatomy of these stems. We can observe vascular bundles comprising phloem and xylem vessels that transport nutrients and water throughout the plant's system. The sectioned and fused vessels within this aberrant stem provide further insight into its unique composition. This mesmerizing photograph not only highlights nature's ability to produce unexpected wonders but also serves as an invaluable resource for botany enthusiasts and researchers studying growth deformities in plants. It offers an opportunity to explore teratology –the study of developmental anomalies– through visual comparison and analysis.
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