Transfer cells and lipid droplets of someValerianaceae |
| |
Authors: | Wolfgang Gaymann Hermann Lörcher |
| |
Institution: | (1) Sektion Elektronenmikroskopie der Universität Ulm, Oberer Eselsberg, D-7900 Ulm, Federal Republic of Germany;(2) Abt. Spezielle Botanik der Universität Ulm, Oberer Eselsberg, Ulm, Federal Republic of Germany |
| |
Abstract: | Development, structure and the axial distribution of transfer cells and their lignification were investigated inValerianella locusta, Valeriana officinalis, andV. tuberosa (Valerianaceae). Fundamental new results are: (1) Transfer cells often contain numerous lipid droplets. Within the stem the distribution of cells containing lipid droplets correlates to that of transfer cells. (2) InValeriana officinalis persisting protuberances are frequently found on pit membranes of xylem transfer cells. Lignified transfer cells can undergo a second modification: a layer covering the secondary wall forms wall ingrowths similar to those of transfer cells. (3) Peripheral pith cells, abuting transfer cells, are able to modify into transfer cells. Cambial derivatives are only temporarily developed as transfer cells. (4) Phloem transfer cells are found in vascular bundles of the whole axis. (5) In roots, xylem transfer cells are poorly developed or absent. (6) Oil cells with oil bodies are present in the rape ofValeriana tuberosa. They are absent however in the stem of the species investigated. (7) Tannins occur in elements of the primary cortex, phloem and secondary xylem ofValeriana officinalis. |
| |
Keywords: | Angiosperms Valerianaceae Transfer cells lignification lipid droplets oil cells tannins Development structure axial distribution transmission electron microscopy |
本文献已被 SpringerLink 等数据库收录! |
|