SEM of ragweed pollen grains

SEM of ragweed pollen grains

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Credit: BIOPHOTO ASSOCIATES/SCIENCE PHOTO LIBRARY

Caption: Ragweed pollen. Coloured scanning electron micro- graph (SEM) of pollen grains (pink) on the stigma (green) of a ragweed plant (Ambrosia sp.). These spiky pollen grains contain the male sex cells of the plant. The multi-lobed stigma, the surface of the flower's female sex organ, the carpel, is where the pollen germinates. Ambrosia sp. is a daisy-like flower which grows in bare and waste ground. Its pollen is wind-borne and released in great quantities for cross-pollination. Ambrosia sp. pollen acts as an allergen causing hay fever (allergic rhinitis or pollinosis) in susceptible individuals. Magnification: x150 at 5x7cm size. Magnification: x75 at 35mm size.

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Keywords: allergy, ambrosia sp., botany, cause, hay fever, hayfever, nature, plant, plants, pollen, pollinosis, ragweed, reproduction, reproductive, rhinitis, stigma, type

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