Abstract
Cytohistologically the shoot apex ofRicinus communis is distinguished into five zones: (i) Tunica, (ii) Corpus, (iii) Flank meristem, (iv) Rib meristem, and (v) Cambium-like zone. The cells of the cambium-like zone are radially elongated and stretched across the apex from the base of the leaf. This zone is formed during the early part of the plastochron. The differentiation of this zone begins in the centre of the apex and proceeds outwards. It becomes fully developed by mid-phase. This zone is responsible for the differentiation of the node and elongation of the stem. Leaf initiation takes place in the second tunica layer and the leaf primordium increases in height by a group of subapical initials. Apical growth of the primordium ceases when it is about 120 microns high. The cells of the middle layers are derived by the periclinal divisions of both adaxial and abaxial hypodermal layers.
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Singh, A., Singh, V. Shoot apex organisation and leaf development inRicinus communis L.. Proc. Indian Acad. Sci. 83, 166–176 (1976). https://doi.org/10.1007/BF03045706
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DOI: https://doi.org/10.1007/BF03045706