Joanna Wysocka‐Diller

Auburn University

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Philip N. Benfey

Duke University

Ykä Helariutta

University of Helsinki

Leonard D. Pysh

Roanoke College

Eduardo R. Macagno

University of California, San Diego

Gabriel O. Aisemberg

Lehman College

Hidehiro Fukaki

Kobe University

Marie-Therès Hauser

BOKU University

Christine Camilleri

Institut Jean-Pierre Bourgin

David Bouchez

Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement

Jocelyn Malamy

University of Chicago

Cooperative Institutions

New York University

Utrecht University

Centre National de la Recherche Scientifique

University of California, San Diego

Nara Institute of Science and Technology

Duke University

University of California, Berkeley

University of Cambridge

BOKU University

University of Agricultural Sciences, Dharwad

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The SHORT-ROOT Gene Controls Radial Patterning of the Arabidopsis Root through Radial Signaling

Cell (2000)

Ykä Helariutta Hidehiro Fukaki Joanna Wysocka‐Diller Keiji Nakajima Jee Jung

Root (linguistics)

10.1016/s0092-8674(00)80865-x

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Citations (1,074)

Antennapedia-Class homeobox genes define diverse neuronal sets in the embryonic CNS of the leech

Journal of Neurobiology (1993)

Gabriel O. Aisemberg Joanna Wysocka‐Diller Victoria Wong Eduardo R. Macagno

Abstract Studies of the Antennapedia ‐class homeobox genes suggest that specific combinations of these transcription factors play a role in defining neuronal identities. We examined the expression of these genes in the leech Hirudo medicinalis , an organism well‐suited for neurobiological research at the level of identified neurons. Leeches contain at least as many Antennapedia ‐class and related genes as insects do, despite the apparently lower complexity of the leech body plan. The CNS expression patterns of two Antennapedia ‐class leech homeobox genes ( Lox genes) were examined in detail. Lox1 is expressed during early gangliogenesis in only one pair of transient neurons present in every segment (the Bipolar cells) and, at later stages of embryonic development, in 15–20 pairs of central neurons repeated in most segments. The monoclonal antibody Laz1‐1 identified two pairs of Lox1 ‐expressing neurons as the Bipolar cells and the L1 neurons. The Bipolar cells extended processes in the primordia of the longitudinal connective nerves and later degenerated. The L1 neurons were detected late in gangliogenesis and became stable neurons. Lox2 is expressed in an iterated set of neurons in the posterior two‐thirds of the CNS. On the basis of cell body position and relative size, two pairs of Lox2 ‐expressing cells were identified as the RPE‐like neurons and the CV motor neurons. Other Lox genes are also expressed in segmentally repeated subpopulations of neurons. These neuronal subpopulations appear to be different from one another but partially overlapping. Different combinations of Lox genes that may be expressed in individual cells could in theory generate enough variability to specify all central neurons in a leech ganglion. © 1993 John Wiley & Sons, Inc.

Antennapedia

Hirudo medicinalis

Neuropil

10.1002/neu.480241012

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Citations (22)

Characterization of a homologue of bithorax complex genes in the leech Hirudo medicinalis

Trends in Genetics (1989)

Joanna Wysocka‐Diller

Ultrabithorax

Fate mapping

10.1016/0168-9525(89)90192-3

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Citations (0)

Molecular analysis of SCARECROW function reveals a radial patterning mechanism common to root and shoot

Development (2000)

Joanna Wysocka‐Diller Ykä Helariutta Hidehiro Fukaki Jocelyn Malamy Philip N. Benfey

ABSTRACT Mutation of the SCARECROW (SCR) gene results in a radial pattern defect, loss of a ground tissue layer, in the root. Analysis of the shoot phenotype of scr mutants revealed that both hypocotyl and shoot inflorescence also have a radial pattern defect, loss of a normal starch sheath layer, and consequently are unable to sense gravity in the shoot. Analogous to its expression in the endodermis of the root, SCR is expressed in the starch sheath of the hypocotyl and inflorescence stem. The SCR expression pattern in leaf bundle sheath cells and root quiescent center cells led to the identification of additional phenotypic defects in these tissues. SCR expression in a pin-formed mutant background suggested the possible origins of the starch sheath in the shoot inflorescence. Analysis of SCR expression and the mutant phenotype from the earliest stages of embryogenesis revealed a tight correlation between defective cell divisions and SCR expression in cells that contribute to ground tissue radial patterning in both embryonic root and shoot. Our data provides evidence that the same molecular mechanism regulates the radial patterning of ground tissue in both root and shoot during embryogenesis as well as postembryonically.

Endodermis

10.1242/dev.127.3.595

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Citations (420)

The GRAS gene family in Arabidopsis : sequence characterization and basic expression analysis of the SCARECROW-LIKE genes

Leonard D. Pysh Joanna Wysocka‐Diller Christine Camilleri David Bouchez Philip N. Benfey

Sequence (biology)

Source

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Citations (40)

Molecular characterization of root growth components in SCARECROW regulated developmental pathway

F1000Research (2013)

A.Eswar Reddy Joanna Wysocka‐Diller

Open peer review

10.7490/f1000research.1090855.1

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Citations (0)

The SCARECROW Gene Regulates an Asymmetric Cell Division That Is Essential for Generating the Radial Organization of the Arabidopsis Root

Cell (1996)

Laura Di Laurenzio Joanna Wysocka‐Diller Jocelyn Malamy Leonard D. Pysh Ykä Helariutta

In the Arabidopsis root meristem, initial cells undergo asymmetric divisions to generate the cell lineages of the root. The scarecrow mutation results in roots that are missing one cell layer owing to the disruption of an asymmetric division that normally generates cortex and endodermis. Tissue-specific markers indicate that a heterogeneous cell type is formed in the mutant. The deduced amino acid sequence of SCARECROW (SCR) suggests that it is a member of a novel family of putative transcription factors. SCR is expressed in the cortex/endodermal initial cells and in the endodermal cell lineage. Tissue-specific expression is regulated at the transcriptional level. These results indicate a key role for SCR in regulating the radial organization of the root.

Endodermis

Asymmetric cell division

Cell fate determination

Cell type

Lateral root

10.1016/s0092-8674(00)80115-4

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Citations (1,081)

ABA and GA signaling pathways interact and regulate seed germination and seedling development under salt stress

Acta Physiologiae Plantarum (2010)

Kun Yuan Aaron M. Rashotte Joanna Wysocka‐Diller

Osmotic shock

Crosstalk

Gibberellic acid

10.1007/s11738-010-0542-6

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Citations (56)

Characterization of a homologue of bithorax-complex genes in the leech Hirudo medicinalis

Nature (1989)

Joanna Wysocka‐Diller Gabriel O. Aisemberg Miriam Baumgarten Michael Levine Eduardo R. Macagno

Antennapedia

Ultrabithorax

Decerebration

Homology

Hirudo medicinalis

10.1038/341760a0

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Citations (95)

The GRAS gene family in Arabidopsis: sequence characterization and basic expression analysis of the SCARECROW‐LIKE genes

The Plant Journal (1999)

Leonard D. Pysh Joanna Wysocka‐Diller Christine Camilleri David Bouchez Philip N. Benfey

Summary Mutations at the SCARECROW (SCR) locus in Arabidopsis thaliana result in defective radial patterning in the root and shoot. The SCR gene product contains sequences which suggest that it is a transcription factor. A number of Arabidopsis Expressed Sequence Tags (ESTs) have been identified that encode gene products bearing remarkable similarity to SCR throughout their carboxyl‐termini, indicating that SCR is the prototype of a novel gene family. These ESTs have been designated SCARECROW‐LIKE (SCL). The gene products of the GIBBERELLIN‐INSENSITIVE (GAI) and the REPRESSOR of ga1–3 (RGA) loci show high structural and sequence similarity to SCR and the SCLs. Sequence analysis of the products of the GRAS (GAI, RGA, SCR) gene family indicates that they share a variable amino‐terminus and a highly conserved carboxyl‐terminus that contains five recognizable motifs. The SCLs have distinct patterns of expression, but all of those analyzed show expression in the root. One of them, SCL3, has a tissue‐specific pattern of expression in the root similar to SCR. The importance of the GRAS gene family in plant biology has been established by the functional analyses of SCR, GAI and RGA.

10.1046/j.1365-313x.1999.00431.x

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Citations (608)