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THE PLANT CELL, Vol 7, Issue 10 1583-1598, Copyright © 1995 by American Society of Plant Biologists
Male and Female Flowers of the Dioecious Plant Sorrel Show Different Patterns of MADS Box Gene Expression
C. Ainsworth, S. Crossley, V. Buchanan-Wollaston, M. Thangavelu and J. Parker
Plant Molecular Biology Laboratory, Department of Biological Sciences, Wye College, University of London, Kent TN25 5AH, United Kingdom
Male and female flowers of the dioecious plant sorrel (Rumex acetosa) each
produce three whorls of developed floral organs: two similar whorls of
three perianth segments and either six stamens (in the male) or a gynoecium
consisting of a fertile carpel and two sterile carpels (in the female). In
the developing male flower, there is no significant proliferation of cells
in the center of the flower, in the position normally occupied by the
carpels of a hermaphrodite plant. In the female flower, small stamen
primordia are formed. To determine whether the organ differences are
associated with differences in the expression of organ identity genes, cDNA
clones representing the putative homologs of B and C function MADS box
genes were isolated and used in an in situ hybridization analysis. The
expression of RAD1 and RAD2 (two different DEFICIENS homologs) in males and
females was confined to the stamen whorl; the lack of expression in the
second, inner perianth whorl correlated with the sepaloid nature of the
inner whorl of perianth segments. Expression of RAP1 (a PLENA homolog)
occurred in the carpel and stamen whorls in very young flower primordia
from both males and females. However, as soon as the inappropriate set of
organs ceased to develop, RAP1 expression became undetectable in those
organs. The absence of expression of RAP1 may be the cause of the arrest in
organ development or may be a consequence.
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