Clonal Analysis Provides Evidence for Transient Initial Cells in Shoot Apical Meristems of Seed Plants

Drift of mutated sectors in sectorial or mericlinal plant chimeras has been interpreted as indirect evidence of initial impermanence at the apex. However, the same effect may result from mutation in noninitial cells positioned close to the vertex of the apical dome. Clonal analysis of the cell packe...

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Bibliographic Details
Published in:Journal of plant growth regulation 2000-03, Vol.19 (1), p.55-64
Main Authors: Zagórska-Marek, B, Turza ska, M
Format: Article
Language:English
Subjects:
Apexes
apical meristems
Chimeras
chimerism
clones
Magnolia
Meristems
mutation
Picea
shoots
Termites
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Summary:Drift of mutated sectors in sectorial or mericlinal plant chimeras has been interpreted as indirect evidence of initial impermanence at the apex. However, the same effect may result from mutation in noninitial cells positioned close to the vertex of the apical dome. Clonal analysis of the cell packets present in the superficial layer of spruce and magnolia apices provided the library of patterns suggesting that the position and the number of initial cells, and in some cases also the meristem axis inclination, may change over time. Multicellular clones originating from a single cell have been found in the geometric center of some apices, whereas in other apices the cellular center (where three or four clonal borders meet) did not correspond to the geometric center of the apex. Such effects may result only from initial impermanence.
ISSN:0721-7595
1435-8107
DOI:10.1007/s003440000007