Interaction of LEAFY, AGAMOUS, and TERMINAL FLOWER1 in maintaining floral identity in Arabidopsis

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OAK-B135 The Arabidopsis transcription factor LEAFY (LFY) acts upstream of homeotic genes such as AGAMOUS (AG) to confer floral identity on meristems that arise after the transition to reproductive development. Compared to the genetic circuitry regulating the establishment of floral meristem identity, little is known about its maintenance. Previous experiments with fly heterozygous plants and ag mutants grown in conditions that reduce the floral inductive stimulus have shown that both genes are required to prevent reversion of floral to inflorescence meristems. Here, we present evidence that LFY maintains floral meristem identity independently of AG, and that the primary role of ... continued below

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Parcy, F., Bomblies, K., and Weigel, D. February 22, 2002.

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OAK-B135 The Arabidopsis transcription factor LEAFY (LFY) acts upstream of homeotic genes such as AGAMOUS (AG) to confer floral identity on meristems that arise after the transition to reproductive development. Compared to the genetic circuitry regulating the establishment of floral meristem identity, little is known about its maintenance. Previous experiments with fly heterozygous plants and ag mutants grown in conditions that reduce the floral inductive stimulus have shown that both genes are required to prevent reversion of floral to inflorescence meristems. Here, we present evidence that LFY maintains floral meristem identity independently of AG, and that the primary role of LFY is either direct repression of shoot identity genes or repression of an intermediate factor that activates shoot identity genes. The latter conclusions were deduced from the phenotypes conferred by a gain-of-function transgene, LFY:VP16, that appears to act as a dominant negative, or antimorphic, allele during maintenance of floral meristem identity. These observations contrast with previous findings that LFY acts as a direct activator of floral homeotic genes, supporting the hypothesis that the transcriptional activity of LFY is dependent on specific co-regulators.

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OSTI as DE00821968

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  • Journal Name: Development; Journal Volume: 129; Other Information: Submitted to Development; Volume 129, ISSN 2519-2527

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  • Report No.: DOE-ER20317-2
  • Grant Number: FG03-98ER20317
  • Office of Scientific & Technical Information Report Number: 821968
  • Archival Resource Key: ark:/67531/metadc777044

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  • February 22, 2002

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  • Dec. 3, 2015, 9:30 a.m.

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  • Aug. 4, 2016, 7:46 p.m.

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Parcy, F., Bomblies, K., and Weigel, D. Interaction of LEAFY, AGAMOUS, and TERMINAL FLOWER1 in maintaining floral identity in Arabidopsis, article, February 22, 2002; United States. (digital.library.unt.edu/ark:/67531/metadc777044/: accessed October 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.