Pollen on stigma of Cocksfoot grass

Pollen on stigma of Cocksfoot grass

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Credit: DR JEREMY BURGESS/SCIENCE PHOTO LIBRARY

Caption: False-colour scanning electron micrograph (SEM) of pollen grains clustered to the stigma of the cocksfoot grass, Dactylis glomerata. Cocksfoot pollen, a summer grass pollen dispersed by the wind, is a major cause of hay fever (medical name Allergic rhinitis & pollenosis). Hay fever sufferers produce a sensitising antibody, immunoglobin E (IgE), which attaches to the surface of cells in the nose & eyes. It reacts with inhaled pollen causing the release of chemicals including histamine. Histamine causes the mucous membranes of the nose, eyes & throat to swell & become inflamed, bringing on the symptoms of hay fever. Magnification: x20 at 6x4.5cm size.

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Keywords: allergic rhinitis, botany, cause, cocksfoot grass, cocksfoot pollen, dactylis glomerata, false-coloured, hay fever, hayfever, nature, plant, plants, pollen, pollinosis, reproduction, reproductive, stigma

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