Pollen grains from common Oak flower

Pollen grains from common Oak flower

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Caption: False colour scanning electron micrograph (SEM) of pollen grains from the common oak flower Quercus robur. Oak trees flower in May/June producing copious quantities of pollen, which is dispersed by the wind. Oak pollen is a major cause of hay fever (medical term 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 170 at 35mm size. original is bw print B786/90.

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Keywords: allergy, botany, cause, common oak, hay fever, hayfever, nature, oak, oak pollen, plant, plants, pollen, quercus robur, reproduction, reproductive, sem, type

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