Cell-lineage patterns in the shoot apical meristem of the germinating maize embryo (original) (raw)
Abstract
A fate map for the shoot apical meristem of Zea mays L. at the time of germination was constructed by examining somatic sectors (clones) induced by γ-rays. The shoot apical meristem produced stem, leaves, and reproductive structures above leaf 6 after germination and the analysis here concerns their formation. On 160 adult plants which had produced 17 or 18 leaves, 277 anthocyanin-deficient sectors were scored for size and position. Sectors found on the ear shoot or in the tassel most often extended into the vegetative part of the plant. Sectors ranged from one to six internodes in length and some sectors of more than one internode were observed at all positions on the plant. Single-internode sectors predominated in the basal internodes (7,8,9) while longer sectors were common in the middle and upper internodes. The apparent number of cells which gave rise to a particular internode was variable and sectors were not restricted to the lineage unit: a leaf, the internode below it, and the axillary bud and prophyll at the base of the internode. These observations established two major features of meristem activity: 1) at the time of germination the developmental fate of any cell or group of cells was not fixed, and 2) at the time of germination cells at the same location in a meristem could produce greatly different amounts of tissue in the adult plant. Consequently, the developmental fate of specific cells in the germinating meristem could only be assigned in a general way.
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Plant developmental oddities
Article Open access 24 September 2024
Abbreviations
ACN:
apparent cell number
LI, LII, LI-LII:
sectors restricted to the epidermis, the subepidermis, or encompassing epidermis and subepidermis
PCN:
progenitor cell
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Author notes
- Carl N. McDaniel
Present address: Plant Science Group, Department of Biology, Rensselaer Polytechnic Institute, 12180-3590, Troy, NY, USA
Authors and Affiliations
- Plant Science Institute, Department of Biology, University of Pennsylvania, 19104-6018, Philadelphia, PA, USA
Carl N. McDaniel & R. Scott Poethig
Authors
- Carl N. McDaniel
- R. Scott Poethig
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McDaniel, C.N., Poethig, R.S. Cell-lineage patterns in the shoot apical meristem of the germinating maize embryo.Planta 175, 13–22 (1988). https://doi.org/10.1007/BF00402877
- Received: 11 January 1988
- Accepted: 11 March 1988
- Issue date: July 1988
- DOI: https://doi.org/10.1007/BF00402877