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Detail of the endodermis and pericycle of Allium root
Legend:
1 cortex
3 pericycle
4 phloem
5 xylem
2 endodermis
English name: Onion
Scientific name: Allium cepa
Familia: Liliaceae
Classis: Monocotyledonas
Phylum: Angiospermae
Regnum: Plantae
The strips of Caspary (named after the German botanist Robert Caspary, 1818-1887) are located in the radial and transversal wall of the endodermis .These wall contain suberin and lignin that render them impervious to liquids and gases. Water and minerals can thus only pass to the pericycle by traversing the cytoplasm of these cells. In this way the endodermis builds a selective barrier.
