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THE PLANT CELL, Vol 4, Issue 9 1089-1100, Copyright © 1992 by American Society of Plant Biologists
The Internal Meristem Layer (L3) Determines Floral Meristem Size and Carpel Number in Tomato Periclinal Chimeras
E. J. Szymkowiak and I. M. Sussex
Department of Biology, Osborn Memorial Laboratories, Yale University, New Haven, Connecticut 06511
Cell-cell interactions are important during plant development. We have
generated periclinal chimeras between plants that differ in the number of
carpels per flower to determine the roles of cells occupying specific
positions in the floral meristem in determining the number of carpels
initiated. Intraspecific chimeras were generated between tomato
(Lycopersicon esculentum) expressing the mutation fasciated, which causes
an increased number of floral organs per whorl, and tomato wild type for
fasciated. Interspecific chimeras were generated between tomato and L.
peruvianum, which differ in number of carpels per flower. In both sets of
chimeras, carpel number as well as the size of the floral meristem during
carpel initiation were not determined by the genotype of cells in the outer
two layers of the meristem (L1 and L2) but were determined by the genotype
of cells occupying the inner layer (L3) of the meristem. We concluded from
these experiments that during floral organ initiation, cells in certain
layers of the meristem respond to information supplied to them from other
cells in the meristem.
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