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THE PLANT CELL, Vol 9, Issue 12 2225-2241, Copyright © 1997 by American Society of Plant Biologists
Soluble Signals from Cells Identified at the Cell Wall Establish a Developmental Pathway in Carrot
P. F. McCabe, T. A. Valentine, L. S. Forsberg and R. I. Pennell
Department of Biology, University College London, Gower Street, London WC1E 6BT, United Kingdom
Cells in a plant differentiate according to their positions and use
cell-cell communication to assess these positions. Similarly, single cells
in suspension cultures can develop into somatic embryos, and cell-cell
communication is thought to control this process. The monoclonal antibody
JIM8 labels an epitope on cells in specific positions in plants. JIM8 also
labels certain cells in carrot embryogenic suspension cultures. We have
used JIM8 and secondary antibodies coupled to paramagnetic beads to label
and immunomagnetically sort single cells in a carrot embryogenic suspension
culture into pure populations. Cells in the JIM8(+) population develop into
somatic embryos, whereas cells in the JIM8(-) population do not form
somatic embryos. However, certain cells in JIM8(+) cultures (state B cells)
undergo asymmetric divisions, resulting in daughter cells (state C cells)
that do not label with JIM8 and that sort to JIM8(-) cultures. State C
cells are competent to form somatic embryos, and we show here that a
conditioned growth medium from a culture of JIM8(+) cells allows state C
cells in a JIM8(-) culture to go on and develop into somatic embryos. JIM8
labels cells in suspension cultures at the cell wall. Therefore, a cell
with a role in cell-cell communication and early cell fate selection can be
identified by an epitope in its cell wall.
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