Transfer cells in the vascular parenchyma of roots
- 60 Downloads
Structural adaptations to increased transport activities were investigated in the cells of vascular parenchyma at the site of the lateral root junction, in non-stressed plant roots. Typical transfer cells were differentiated in dicotyledonousHelianthus tuberosus and in two different genotypes ofH. annuus, the cv. IBH166 and a decorative form. In the representatives of monocotyledonous, no structural adaptations occurred in the roots ofHordeum vulgare but small and rare cell wall protuberances were found in xylem and phloem ofZea mays inbred line VIR17. Some degree of cell wall labyrinth differentiation was seen in xylem and typical transfer cells were found in phloem of the roots of the maize hybrid CE380. The capability of vascular parenchyma to differentiate transfer cells did not depend on species, genotype, or on the growing conditions withHelianthus. On the other hand, the development of the structural adaptations in monocotyledonous representatives depended on both the species and the genotype. This capability may be linked with the taxonomic and evolutionary position of plant species.
KeywordsLateral Root Transfer Cell Structural Adaptation Xylem Parenchyma Phloem Parenchyma
Unable to display preview. Download preview PDF.
- Gamalei, Yu.V., Pakhomova, M.V.: [Minor veins of dicotyledonous leaf. II. Taxonomical distribution of the main types]. -Bot. Zh.68: 428–438, 1983. [In Russ.].Google Scholar
- Gamalei, Yu.V., Pakhomova, M.V.: [Minor veins of dicotyledonous leaf. III. Structure, functions, evolution]. - Bot. Zh.69: 1159–1166, 1984. [In Russ.].Google Scholar
- Johri, B.M. (ed.): Embryology of Angiosperms. - Springer Verlag, Berlin - Heidelberg - New York - Tokyo 1984.Google Scholar
- Kramer, D., Läuchli, A., Yeo, R., Gullasch, J.: Transfer cells in roots ofPhaseolus coccineus: Ultrastructure and possible function in exclusion of sodium from the shoot. - Ann. Bot.41: 1031–1040, 1977.Google Scholar
- Läuchli, A., Kramer, D., Stelzer, R: Ultrastructure and ion localization in xylem parenchyma cells of roots. - In: Zimmermann, U., Dainty, J. (ed.): Membrane Transport in Plants. Pp. 363–371. Springer Verlag, Berlin - Heidelberg - New York. 1974.Google Scholar
- Luxová, M.: Effect of lateral root formation on the vascular pattern of barley roots. - Bot. Acta103: 305–310, 1990.Google Scholar