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THE PLANT CELL, Vol 1, Issue 1 37-52, Copyright © 1989 by American Society of Plant Biologists
Genes Directing Flower Development in Arabidopsis
J. L. Bowman, D. R. Smyth and E. M. Meyerowitz
Division of Biology, 156-29, California Institute of Technology, Pasadena, California 91125
We describe the effects of four recessive homeotic mutations that
specifically disrupt the development of flowers in Arabidopsis thaliana.
Each of the recessive mutations affects the outcome of organ development,
but not the location of organ primordia. Homeotic transformations observed
are as follows. In agamous-1, stamens to petals; in apetala2-1, sepals to
leaves and petals to staminoid petals; in apetala3-1, petals to sepals and
stamens to carpels; in pistillata-1, petals to sepals. In addition, two of
these mutations (ap2-1 and pi-1) result in loss of organs, and ag-1 causes
the cells that would ordinarily form the gynoecium to differentiate as a
flower. Two of the mutations are temperature-sensitive. Temperature shift
experiments indicate that the wild-type AP2 gene product acts at the time
of primordium initiation; the AP3 product is active later. It seems that
the wild-type alleles of these four genes allow cells to determine their
place in the developing flower and thus to differentiate appropriately. We
propose that these genes may be involved in setting up or responding to
concentric, overlapping fields within the flower primordium.
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