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Annals of Botany 72: 409-414, 1993
© 1993 Annals of Botany Company

Contents of Tannins and their Histological Localization in Young and Adult Parts of Struthanthus vulgaris Mart. (Loranthaceae)

A. Salatino, J. E. Kraus and M. L.F. Salatino

Departamento de Botânica, Instituto de Biociéncias, Universidade de São Paulo, Caixa Postal 11461, CEP 05499, São Paulo, SP, Brazil

Adult organs of Struthanthus vulgaris, a very common mistletoe in south east Brazil, present relatively high amounts of condensed tannins. In adult organs, tannins are found as large intracellular deposits. In leaves, tannic deposits are more common in palisade and midrib parenchyma. The cortex of the stem and root contains many cells with tannic deposits. The wood of both organs contains intracellular deposits almost completely confined to the parenchyma rays. Tannins of the adult fruits are localized in the viscin layer surrounding the seed. The content of tannins in 10-d-old seedlings is low, but increases rapidly with development. The area that will give rise to the lysigenous gland in the young root also presents tannic intracellular deposits. The secondary haustorial system presents intracellular tannins in the zone of contact with the host.Copyright 1993, 1999 Academic Press

Struthanthus vulgaris, Loranthaceae, mistletoe, tannins, histological localization


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