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2 results on '"Parizot B"'

1. Auxin-dependent cell cycle reactivation through transcriptional regulation of Arabidopsis E2Fa by lateral organ boundary proteins.

Author

Berckmans B, Vassileva V, Schmid SP, Maes S, Parizot B, Naramoto S, Magyar Z, Alvim Kamei CL, Koncz C, Bögre L, Persiau G, De Jaeger G, Friml J, Simon R, Beeckman T, and De Veylder L

Subjects
Arabidopsis cytology, Arabidopsis genetics, Arabidopsis Proteins metabolism, E2F Transcription Factors metabolism, Gene Expression Regulation, Plant genetics, Gene Knockout Techniques, Mutagenesis, Insertional, Plant Roots cytology, Plant Roots genetics, Plant Vascular Bundle cytology, Plant Vascular Bundle genetics, Plant Vascular Bundle physiology, Plants, Genetically Modified, Promoter Regions, Genetic genetics, Signal Transduction physiology, Nicotiana genetics, Nicotiana metabolism, Transcription Factors genetics, Transcription Factors metabolism, Transcriptional Activation, Arabidopsis physiology, Arabidopsis Proteins genetics, Cell Cycle physiology, E2F Transcription Factors genetics, Indoleacetic Acids metabolism, Plant Roots physiology
Abstract

Multicellular organisms depend on cell production, cell fate specification, and correct patterning to shape their adult body. In plants, auxin plays a prominent role in the timely coordination of these different cellular processes. A well-studied example is lateral root initiation, in which auxin triggers founder cell specification and cell cycle activation of xylem pole-positioned pericycle cells. Here, we report that the E2Fa transcription factor of Arabidopsis thaliana is an essential component that regulates the asymmetric cell division marking lateral root initiation. Moreover, we demonstrate that E2Fa expression is regulated by the LATERAL ORGAN BOUNDARY DOMAIN18/LATERAL ORGAN BOUNDARY DOMAIN33 (LBD18/LBD33) dimer that is, in turn, regulated by the auxin signaling pathway. LBD18/LBD33 mediates lateral root organogenesis through E2Fa transcriptional activation, whereas E2Fa expression under control of the LBD18 promoter eliminates the need for LBD18. Besides lateral root initiation, vascular patterning is disrupted in E2Fa knockout plants, similarly as it is affected in auxin signaling and lbd mutants, indicating that the transcriptional induction of E2Fa through LBDs represents a general mechanism for auxin-dependent cell cycle activation. Our data illustrate how a conserved mechanism driving cell cycle entry has been adapted evolutionarily to connect auxin signaling with control of processes determining plant architecture.

Published
2011
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2. Comparative transcriptomics as a tool for the identification of root branching genes in maize

Author

Tom Beeckman, Rui-Guang Zhen, Cristian Forestan, Philippe Fonteyne, Boris Parizot, Bryan D. McKersie, Jens Hollunder, Leentje Jansen, Ianto Roberts, Charlotte Van Quickenborne, Jansen L., Hollunder J., Roberts I., Forestan C., Fonteyne P., Van Quickenborne C., Zhen R.-G., Mckersie B., Parizot B., and Beeckman T.

Subjects
Indoleacetic Acid, Arabidopsis thaliana, Arabidopsis, Plant Science, Root system, Genome, Plant Roots, Zea mays, Transcriptome, Zea may, Auxin, Gene Expression Regulation, Plant, Botany, Gene, Plant Proteins, chemistry.chemical_classification, biology, Indoleacetic Acids, Gene Expression Profiling, fungi, Lateral root, Cell Cycle, Plant Protein, food and beverages, Plant Root, biology.organism_classification, Maize, chemistry, Evolutionary biology, Comparative transcriptomic, Lateral root initiation, Arabidopsi, Agronomy and Crop Science, Cell Division, Biotechnology
Abstract

The root system is fundamental for plant development, is crucial for overall plant growth and is recently being recognized as the key for future crop productivity improvement. A major determinant of root system architecture is the initiation of lateral roots. While knowledge of the genetic and molecular mechanisms regulating lateral root initiation has mainly been achieved in the dicotyledonous plant Arabidopsis thaliana, only scarce data are available for major crop species, generally monocotyledonous plants. The existence of both similarities and differences at the morphological and anatomical level between plant species from both clades raises the question whether regulation of lateral root initiation may or may not be conserved through evolution. Here, we performed a targeted genome-wide transcriptome analysis during lateral root initiation both in primary and in adventitious roots of Zea mays and found evidence for the existence of common transcriptional regulation. Further, based on a comparative analysis with Arabidopsis transcriptome data, a core of genes putatively conserved across angiosperms could be identified. Therefore, it is plausible that common regulatory mechanisms for lateral root initiation are at play in maize and Arabidopsis, a finding that might encourage the extrapolation of knowledge obtained in Arabidopsis to crop species at the level of root system architecture. © 2013 Society for Experimental Biology, Association of Applied Biologists and John Wiley & Sons Ltd.

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