Ragweed pollen

Ragweed pollen

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Caption: Ragweed pollen. Coloured Scanning Electron Micro- graph (SEM) of pollen grains on the stigma of a ragweed plant Ambrosia sp. The grains of pollen (yellow) have a spiked surface appearance. The multi-lobed stigma is green. Ambrosia is a daisy- like flower which grows in bare and waste ground. Its pollen is windborne and released in great quantities for cross-pollination. Ambrosia pollen acts as an allergen causing hay fever (pollenosis) in allergic individuals. Sufferers produce a sensitive antibody which is found on the surface of cells in the nose and eyes; the antibody reacts to the pollen and the nose, throat and eyes become inflamed. Magnification: x150 at 5x7cm size.

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Keywords: allergen, allergy, ambrosia sp., botany, cause, coloured, grains, hay fever, hayfever, many, multiple, nature, plant, plants, pollen, pollinosis, ragweed, reproduction, reproductive, rhinitis, scanning electron micrograph, sem, sneezing causing, stigma, type

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