Abstract
InAucuba andWeigela the six vascular bundles distributed as a hexagon become connected tangentially by meristematic cells into a procambial cylinder in the early stage. In the tangential view, the procambial cylinder shows a rather homogeneous structure.
InAucuba, some cells of the procambium elongate in a relatively earlier stage and the rest also elongate during subsequent stages. All of these cells have tapering end walls. Then some long cells divide transversely and form two systems in the vascular meristem, one made up of long cells and the other of short ones. The long cells become the fusiform initials and the short cells, the ray initials.
InWeigela, the homogeneous procambium is organized in the later stages into two systems, one of long cells and the other of short cells in axial files. Most of the long cells have tapering end walls and the short cells transverse end walls. Some of the short cells elongate to intrude between adjacent cells and become long cells. The long cells become the fusiform initials. Radial divisions in some short cells occur occasionally. Some of these cells elongate and the rest remain in the axial files. Some short cells in the axial files are vertically separated from each other by the elongation of adjacent long cells. however, this occurs infrequently and the height of axial files is still several decades of cells. Short cells in axial files eventually become ray initials.
Similar content being viewed by others
References
Bailey, I.M. 1920. The cambium and its derivative tissues II. Size variations of cambial initials in gymnosperms and angiosperms. Amer. J. Bot.7: 355–367.
Barghoorn, E.S. Jr. 1940. The ontogenetic development and phylogenetic specialization of dicotyledons. I. The primitive ray structure. Amer. J. Bot.27: 918–928.
Blyth, A. 1958. Origin of primary extraxylary stem fibers in dicotyledons. Calif. Univ., Publ., Bot.31: 145–232.
Catesson, A.M. 1964. Origin, fonctionnement et variations cytologiques saisonnières du cambium de l'Acer pseudoplatanus L. (Acéracées). Ann. Sci. nat. (Bot.) 12 ser.5: 229–498.
Cumbie, B.G. 1967. Development and structure of the xylem inCanavalia (Leguminosae). Bull. Torrey Bot. Club94: 162–175.
Esau, K. 1936. Ontogeny and structure of collenchyma and of vascular tissues in celery petioles. Hilgardia10: 431–476.
1938. Ontogeny and structure of the phloem of tobacco. Hilgardia11: 343–424.
1943. Origin and development of primary vascular tissues in seed plants. Bot. Rev.9: 125–206.
1965. Vascular Differentiation in Plants. Holt, Rinehart and Winston, New York.
Gunckel, J.E. andR.H. Wetmore. 1946. Studies of development in long shoots and short shoots ofGinkgo biloba L. II. Phyllotaxis and the organization of the primary vascular systems: primary phloem and primary xylem. Amer. J. Bot.33: 532–543.
Metcalfe, C.R. andL. Chalk. 1950. Anatomy of the Dicotyledons. vol. II. Clarendon Press, Oxford.
Soh, W.Y. 1972. Early ontogeny of vascular cambium I.Ginkgo biloba. Bot. Mag. Tokyo85: 111–124.
Thompson, N.P. andC. Heimsch. 1964. Stem anatomy and aspects of development in tomato. Amer. J. Bot.51: 7–19.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Soh, W.Y. Early ontogeny of vascular cambium II.Aucuba japonica andWeigela coraeensis . Bot Mag Tokyo 87, 17–32 (1974). https://doi.org/10.1007/BF02489551
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02489551