Arabidopsis floral homeotic gene BELL (BEL1) controls ovule development through negative regulation of AGAMOUS gene (AG)
Ovules are the developmental precursors of seeds. In angiosperms the ovules are enclosed within the central floral organs, the carpels. We have identified a homeotic mutation in Arabidopsis, "bell" (bel1), which causes transformation of ovule integuments into carpels. In situ hybridization...
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Published in | Proceedings of the National Academy of Sciences - PNAS Vol. 91; no. 13; pp. 5761 - 5765 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
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United States
National Academy of Sciences of the United States of America
21.06.1994
National Acad Sciences National Academy of Sciences |
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Abstract | Ovules are the developmental precursors of seeds. In angiosperms the ovules are enclosed within the central floral organs, the carpels. We have identified a homeotic mutation in Arabidopsis, "bell" (bel1), which causes transformation of ovule integuments into carpels. In situ hybridization analysis shows that this mutation leads to increased expression of the carpel-determining homeotic gene AGAMOUS (AG) in the mutant ovules. Introduction of a constitutively expressed AG transgene into wild-type plants causes the ovules to resemble those of bel1 mutants. We propose that the BEL1 gene product directs normal integument development, in part by suppressing AG expression in this structure. Our results allow expansion of the current model of floral organ identity to include regulation of ovule integument identity. |
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AbstractList | Ovules are the developmental precursors of seeds. In angiosperms the ovules are enclosed within the central floral organs, the carpels. We have identified a homeotic mutation in Arabidopsis, "bell" (bel1), which causes transformation of ovule integuments into carpels. In situ hybridization analysis shows that this mutation leads to increased expression of the carpel-determining homeotic gene AGAMOUS (AG) in the mutant ovules. Introduction of a constitutively expressed AG transgene into wild-type plants causes the ovules to resemble those of bel1 mutants. We propose that the BEL1 gene product directs normal integument development, in part by suppressing AG expression in this structure. Our results allow expansion of the current model of floral organ identity to include regulation of ovule integument identity. In situ hybridization analysis shows that a homeotic mutation in Arabidopsis, "bell" (bel1), leads to increased expression of the carpel-determining homeotic gene AGAMOUS (AG) in mutant ovules. Ovules are the developmental precursors of seeds. In angiosperms the ovules are enclosed within the central floral organs, the carpels. We have identified a homeotic mutation in Arabidopsis, "bell" (bel1), which causes transformation of ovule integuments into carpels. In situ hybridization analysis shows that this mutation leads to increased expression of the carpel-determining homeotic gene AGAMOUS (AG) in the mutant ovules. Introduction of a constitutively expressed AG transgene into wild-type plants causes the ovules to resemble those of bel1 mutants. We propose that the BEL1 gene product directs normal integument development, in part by suppressing AG expression in this structure. The results allow expansion of the current model of floral organ identity to include regulation of ovule integument identity. Ovules are the developmental precursors of seeds. In angiosperms the ovules are enclosed within the central floral organs, the carpels. We have identified a homeotic mutation in Arabidopsis, "bell" (bel1), which causes transformation of ovule integuments into carpels. In situ hybridization analysis shows that this mutation leads to increased expression of the carpel-determining homeotic gene AGAMOUS (AG) in the mutant ovules. Introduction of a constitutively expressed AG transgene into wild-type plants causes the ovules to resemble those of bel1 mutants. We propose that the BEL1 gene product directs normal integument development, in part by suppressing AG expression in this structure. Our results allow expansion of the current model of floral organ identity to include regulation of ovule integument identity |
Author | Preuss, D Lang, J.D Gasser, C.S Ray, A Milligan, S.B Robinson-Beers, K Ray, S Baker, S.C |
AuthorAffiliation | Department of Biology, University of Rochester, NY 14627 |
AuthorAffiliation_xml | – name: Department of Biology, University of Rochester, NY 14627 |
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BackLink | https://www.ncbi.nlm.nih.gov/pubmed/7912435$$D View this record in MEDLINE/PubMed |
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Snippet | Ovules are the developmental precursors of seeds. In angiosperms the ovules are enclosed within the central floral organs, the carpels. We have identified a... In situ hybridization analysis shows that a homeotic mutation in Arabidopsis, "bell" (bel1), leads to increased expression of the carpel-determining homeotic... |
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SubjectTerms | ADN Alleles Arabidopsis Arabidopsis - genetics Arabidopsis - metabolism Arabidopsis - ultrastructure ARABIDOPSIS THALIANA Botany Calyx Carpels DIFERENCIACION CELULAR DIFFERENCIATION CELLULAIRE EXPRESION GENICA EXPRESSION DES GENES Flowering Flowers GENE Gene Expression Regulation GENES Genes, Homeobox Genes, Plant Genetic mutation GENETICA GENETIQUE In Situ Hybridization Integument Microscopy, Electron, Scanning MUTACION MUTATION OVULE Ovules OVULO Plant cells Plants PROTEINAS PROTEINE Transformation, Genetic |
Title | Arabidopsis floral homeotic gene BELL (BEL1) controls ovule development through negative regulation of AGAMOUS gene (AG) |
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