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La función secretora de la endodermis de la raíz de especies de Lychnophora Mart. (Asteraceae)

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Author(s): Luque, Rebeca | Menezes, Nanuza | Semir, João

Journal: Plantula
ISSN 1316-1547

Volume: 1;
Issue: 3;
Start page: 221;
Date: 1997;
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Keywords: Asteraceae | Lychnophora Mart. | Root anatomy | Endodermis | Scretion | Campos rupestres | Brazil.

ABSTRACT
The root anatomy was studied in three species of the genera Lychnophora. A character that appears to be shared by these species is the presence of VAM mycorrhiza, indicating an adaptation to campo rupestre environments. There are other common characters that may be considered proper of the Asteraceae family such as: the presence of secretory canals associated to the endodermis, always oposite to the primary phloem poles, these canals are outlined at least in tje early stages of the root, by four cells, two external ones and two internal endodermic cells, in which the Caspary stripes may be observed. An important finding of this study was the secretory activity of the endodermic cells wich occurs in two stages, a first stage in wich the endodermic cells exhibit a content of lipidic droplets, followed by a second stage in wich the lumen of the cells appears to be full of an amorphous, resinose substance. It was likewise observed that the number of the secretory canals facing the phloem varies according to the species. Other common characters are the large amount of lipidic substances in the cortex as well as the exogenous origin of the phellogen.
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