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THE PLANT CELL, Vol 2, Issue 4 291-299, Copyright © 1990 by American Society of Plant Biologists
Flavonoid Genes in Petunia: Addition of a Limited Number of Gene Copies May Lead to a Suppression of Gene Expression
A. R. van der Krol, L. A. Mur, M. Beld, JNM. Mol and A. R. Stuitje
Department of Genetics, Free University, De Boelelaan 1087, 1081 HV Amsterdam, The Netherlands
To evaluate the effect of increased expression of genes involved in flower
pigmentation, additional dihydroflavonol-4-reductase (DFR) or chalcone
synthase (CHS) genes were transferred to petunia. In most transformants,
the increased expression had no measurable effect on floral pigmentation.
Surprisingly, however, in up to 25% of the transformants, a reduced floral
pigmentation, accompanied by a dramatic reduction of DFR or CHS gene
expression, respectively, was observed. This phenomenon was obtained with
both chimeric gene constructs and intact CHS genomic clones. The reduction
in gene expression was independent of the promoter driving transcription of
the transgene and involved both the endogenous gene and the homologous
transgene. The gene-specific collapse in expression was obtained even after
introduction of only a single gene copy. The similarity between the sense
transformants and regulatory CHS mutants suggests that this mechanism of
gene silencing may operate in naturally occurring regulatory circuits.
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M. Stam, A. Viterbo, J. N. M. Mol, and J. M. Kooter
Position-Dependent Methylation and Transcriptional Silencing of Transgenes in Inverted T-DNA Repeats: Implications for Posttranscriptional Silencing of Homologous Host Genes in Plants
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A. O. Merlo, N. Cowen, T. Delate, B. Edington, O. Folkerts, N. Hopkins, C. Lemeiux, T. Skokut, K. Smith, A. Woosley, et al.
Ribozymes Targeted to Stearoyl–ACP {Delta}9 Desaturase mRNA Produce Heritable Increases of Stearic Acid in Transgenic Maize Leaves
PLANT CELL,
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[Abstract]
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J.-C. Palauqui and H. Vaucheret
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PNAS,
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[Abstract]
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Epigenetic Instability and Trans-Silencing Interactions Associated With an SPT::Ac T-DNA Locus in Tobacco
Genetics,
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457 - 470.
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S.-Z. Pang, F.-J. Jan, and D. Gonsalves
Nontarget DNA sequences reduce the transgene length necessary for RNA-mediated tospovirus resistance in transgenic plants
PNAS,
July 22, 1997;
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[Abstract]
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R. A. Jorgensen
Cosuppression, Flower Color Patterns, and Metastable Gene Expression States
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May 5, 1995;
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[Abstract]
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A R van der Krol, A Brunelle, S Tsuchimoto, and N H Chua
Functional analysis of petunia floral homeotic MADS box gene pMADS1.
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[Abstract]
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C P Romano, M B Hein, and H J Klee
Inactivation of auxin in tobacco transformed with the indoleacetic acid-lysine synthetase gene of Pseudomonas savastanoi.
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[Abstract]
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J.-B. Morel, C. Godon, P. Mourrain, C. Beclin, S. Boutet, F. Feuerbach, F. Proux, and H. Vaucheret
Fertile Hypomorphic ARGONAUTE (ago1) Mutants Impaired in Post-Transcriptional Gene Silencing and Virus Resistance
PLANT CELL,
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[Abstract]
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