Spirally-thickened xylem from palm tree

Spirally-thickened xylem from palm tree

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Credit: J.C. REVY, ISM/SCIENCE PHOTO LIBRARY

Caption: Light micrograph of spirally-thickened xylem elements in a longitudinal section through the stem of an unidentified palm. Xylem tissue is responsible for the upward transport of water and solutes in the plant. The spiral bands provide reinforcement for its tubes. The first cells to be formed were those on the right, and elongation of the stem during growth has pulled out the spiral coils. Moving left across the picture, the spirals show a progressive reduction in spacing because the cells were formed later and have consequently undergone less stretching. Magnification: x320 at 35mm size.

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Keywords: botany, cell, images, longitudinal section, magnified image, microscopic photos, nature, palm tree, plant, plants, spiral, spirally thickened, subjects, vascular, xylem, xylem cells, xylem elements

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