A Fine Structural Study of in vivo Pollen Tube Penetration in Lychnis alba

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Abstract
Light and electron microscope observations were made on the growth of Lychnis alba pollen tubes in vivo. Pollen tubes were found to gain entrance to the style primarily by penetration into swollen primary walls of epidermal papillae, with subsequent growth into the inter-cellular substance of the stylar tissues. Intracellular penetration by pollen tubes is believed to be physically inhibited by the compactness of cell wall fibrils at the wall-cytoplasmic interfaces. Cytoplasmic decomposition of the style that accompanied pollen tube growth is largely attributed to direct enzyme action initiated by pollen tubes.

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