False-col SEM of pollen grains on stigma

False-col SEM of pollen grains on stigma

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Caption: False colour scanning electron micrograph (SEM) of pollen grains on the stigma (centre), of the flower of annual meadow grass, Poa annua. The stigma is sandwiched between two anthers, the outer dimpled walls being visible on either side. Meadow grass pollen is a major cause of hay fever (Allergic rhinitis & pollenosis). Sufferers produce an antibody, immunoglobin E (IgE),which attaches to cells in the nose & eyes. It reacts with inhaled pollen causing the release of various chemicals including histamine. Histamine causes the mucous membranes of the nose, eyes & throat to swell & become inflamed, bringing on the hay fever attack. Magnification: X 77 at 35mm size. Original is bw print B786/081

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Keywords: allergic rhinitis, botany, cause, grass, hay fever, hayfever, meadow, meadow grass, nature, plant, plants, poa annua, pollen, reproduction, reproductive, sem, stigma, type

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