The Extrafloral Nectaries of Sambucus nigra

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Abstract
The structure and ultrastructure of the extrafloral nectaries of Sambucus nigra L. were studied. These nectaries are stalk-like and occur at the bases of the leaves and leaflets. The nectariferous tissue occurs at the top of the nectary and is continuous with the single central vascular bundle. The nectariferous cells have a dense cytoplasm and contain a well developed endoplasmic reticulum. With the commencement of nectar secretion disintegration of the nectariferous cells takes place. This process starts at the summit of the nectary and proceeds downwards. The question as to whether the process of secretion is holocrine or merocrine is discussed.