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THE PLANT CELL, Vol 9, Issue 3 335-353, Copyright © 1997 by American Society of Plant Biologists
TOUSLED Participates in Apical Tissue Formation during Gynoecium Development in Arabidopsis
J. L. Roe, J. L. Nemhauser and P. C. Zambryski
Department of Plant Biology, 111 Koshland Hall, University of California, Berkeley, California 94720
Mutations at the TOUSLED (TSL) protein kinase locus in Arabidopsis cause
reduced differentiation of apical gynoecial tissues and eliminate the
fusion of the style and septum. TSL expression becomes confined to the
developing style by stage 13, where it may promote expansion of tissues.
Double mutant analysis suggests that ETTIN interacts with TSL, possibly by
restricting TSL expression to apical regions. TSL, LEUNIG, and PERIANTHIA
appear to participate in pathways of redundant function during the
development of specific gynoecial tissues. TSL and LEUNIG most likely
function in similar pathways during ovule development. TSL acts
independently of the function of the organ identity genes AGAMOUS and
APETALA2, and it is required for the formation of specific tissues in
ectopic carpels. Mutations in TSL, ETTIN, PERIANTHIA, and LEUNIG all affect
floral organ number as well as gynoecium morphology. Their respective
wild-type loci must therefore play important roles in early floral meristem
development during initiation of organ primordia in addition to their
functions during regional differentiation within developing gynoecial
primordia.
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