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A COMPARISON OF ROOT CAP CELLS OF EPIPHYTIC, TERRESTRIAL AND AQUATIC PLANTS
Author(s) -
Mollenhauer Hilton H.
Publication year - 1967
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1967.tb10762.x
Subject(s) - endoplasmic reticulum , biology , ultrastructure , botany , hyacinth , microbiology and biotechnology , root cap , golgi apparatus , staining , meristem , paleontology , genetics , shoot
Outer cells from the root cap of Cattleya orchids are characterized by their secretory activity. They are arranged in layers intercalated with layers of secretory product and form a protective mantle over the root tip. The ultrastructure of these cells is similar to those of terrestrial roots (for example Zea mays ) in that they are characterized by copious quantities of endoplasmic reticulum and numerous dense‐staining prevacuolar bodies. In contrast, most root cap cells of water hyacinth and duckweed are highly vacuolate with no dense‐staining prevacuolar bodies. The endoplasmic reticulum is sparse and dictyosomes are small and without secretory activity.