Ellen Wisman

Max Planck Institute for Plant Breeding Research

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Heinz Saedler

Max Planck Institute for Plant Breeding Research

Elvira Baumann

Max Planck Institute for Plant Breeding Research

Jeff Landgraf

Michigan State University

Robert J. Schaffer

University of Auckland

C.E. Holmes

Marist College

M. S. Ramanna

Gandhi Medical College & Hospital

W.L. Beane

Virginia Tech

R.W. Engel

Australia and New Zealand Banking Group

Alexander Yephremov

Max Planck Institute for Plant Breeding Research

Peter Huijser

Max Planck Institute for Plant Breeding Research

Cooperative Institutions

Max Planck Institute for Plant Breeding Research

Max Planck Society

Michigan State University

John Innes Centre

University of California, San Diego

Norwich Research Park

Graduate School Experimental Plant Sciences

Virginia Tech

Institut de Biologie Moléculaire des Plantes

Wageningen University & Research

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The Arabidopsis ATHB-8 HD-Zip Protein Acts as a Differentiation-Promoting Transcription Factor of the Vascular Meristems

PLANT PHYSIOLOGY (2001)

Simona Baima Marco Possenti Antonella Matteucci Ellen Wisman Maria Maddalena Altamura

Abstract ATHB-8, -9, -14, -15, and IFL1/REV are members of a small homeodomain-leucine zipper family whose genes are characterized by expression in the vascular tissue. ATHB-8, a gene positively regulated by auxin (Baima et al., 1995), is considered an early marker of the procambial cells and of the cambium during vascular regeneration after wounding. Here, we demonstrate that although the formation of the vascular system is not affected inathb8 mutants, ectopic expression of ATHB-8 in Arabidopsis plants increased the production of xylem tissue. In particular, a careful anatomical analysis of the transgenic plants indicated that the overexpression of ATHB-8 promotes vascular cell differentiation. First, the procambial cells differentiated precociously into primary xylem. In addition, interfascicular cells also differentiated precociously into fibers. Finally, the transition to secondary growth, mainly producing xylem, was anticipated in transgenic inflorescence stems compared with controls. The stimulation of primary and secondary vascular cell differentiation resulted in complex modifications of the growth and development of the ATHB-8 transgenic plants. Taken together, these results are consistent with the hypothesis that ATHB-8 is a positive regulator of proliferation and differentiation, and participates in a positive feedback loop in which auxin signaling induces the expression of ATHB-8, which in turn positively modulates the activity of procambial and cambial cells to differentiate.

Vascular tissue

Vascular cambium

Ectopic expression

Secondary growth

10.1104/pp.126.2.643

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Citations (443)

Arabidopsis microarrays identify conserved and differentially expressed genes involved in shoot growth and development from distantly related plant species

The Plant Journal (2003)

David P. Horvath Robert J. Schaffer Mark West Ellen Wisman

Expressed sequence tags (EST)-based microarrays are powerful tools for gene discovery and signal transduction studies in a small number of well-characterized species. To explore the usefulness of this technique for poorly characterized species, we have hybridized the 11,522-element Arabidopsis microarrays with labeled cDNAs from mature leaf and shoot apices from several different species. Expression of 23 to 47% of the genes on the array was detected, demonstrating that a large number of genes from distantly related species can be surveyed on Arabidopsis arrays. Differential expression of genes with known functions was indicative of the physiological state of the tissues tested. Genes involved in cell division, stress responses, and development were conserved and expressed preferentially in growing shoots.

Conserved sequence

10.1046/j.1365-313x.2003.01706.x

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Citations (98)

New Molecular Phenotypes in the dst Mutants of Arabidopsis Revealed by DNA Microarray Analysis

The Plant Cell (2001)

Miguel A. Pérez‐Amador Preetmoninder Lidder Mark A. Johnson Jeff Landgraf Ellen Wisman

10.2307/3871529

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Citations (1)

Regulation of Polar Auxin Transport by AtPIN1 in Arabidopsis Vascular Tissue

Science (1998)

Leo Gälweiler Changhui Guan Andreas Müller Ellen Wisman Kurt Mendgen

Polar auxin transport controls multiple developmental processes in plants, including the formation of vascular tissue. Mutations affecting the PIN-FORMED (PIN1) gene diminish polar auxin transport in Arabidopsis thaliana inflorescence axes. The AtPIN1 gene was found to encode a 67-kilodalton protein with similarity to bacterial and eukaryotic carrier proteins, and the AtPIN1 protein was detected at the basal end of auxin transport–competent cells in vascular tissue. AtPIN1 may act as a transmembrane component of the auxin efflux carrier.

Polar auxin transport

Vascular tissue

10.1126/science.282.5397.2226

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Citations (1,502)

Composition of Poultry Offal

Poultry Science (1957)

Ellen Wisman C.E. Holmes R.W. Engel

Poultry offal, either raw or cooked to conform to health laws, is utilized widely as a feed supplement for pets, fur-bearing animals and increasing numbers of swine. Little information is available in the literature, however, on the nutrient composition of offal, which is necessary for optimal diet formulations. Mitchell et al. (1926 (1931) reported a partial analysis of offal which included blood. Morris (1946) reported a more complete analysis but did not describe the gross composition. The availability and utilization of poultry offal, together with some composition data, have been discussed in comprehensive reports by Kahle and Gray (1956) and Lortscher et al. (1957). Reported here are data on the analysis of offal (heads, feet and inedible viscera) taken from 30 ten-week old Indian River broilers chosen at random from another experiment. The number included three birds of each sex fed five assorted diets. The offal from each bird was . . .

Gray (unit)

10.3382/ps.0361099

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Citations (7)

Indole Tolerance and the Influence of Aureomycin in the Growing Chick

Poultry Science (1957)

Ellen Wisman R.W. Engel C.E. Holmes

INDOLE is a toxic compound produced in the intestine by the action of putrefactive bacteria on unabsorbed protein material. Upon absorption, however, it is readily converted to indican, a non-toxic product, and excreted through the kidney. The conversion occurs primarily in the liver. Five decades ago the capacity of this mechanism in the dog and rabbit was reported to be adequate in preventing any toxicity from normally absorbed indole (Hervieux, 1907). As far as can be ascertained in the literature, the degree of indole tolerance has not been determined for poultry. Changes in the number and kind of intestinal microorganisms following the feeding of antibiotics to chicks and poults have been reported by many investigators. Anderson et al. (1952), Romoser et al. (1952) and Sieburth et al. (1952) noted increases in E. coli and Proteus organisms both of which are noted indole formers. In rats, however, two Japanese workers (Makino …

Chlortetracycline

10.3382/ps.0360139

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Citations (1)

Utilization of Hatchery By-Product Meal by the Laying Hen

Poultry Science (1965)

Ellen Wisman W.L. Beane

A recent report by Wisman (1964) showed that processed hatchery refuse could be used in rations for growing chickens. Because of the high calcium content (20%), the maximum level of the by-product was determined to be about 5% which represented only about 1.25% protein addition. The investigation has been extended here to determine the nutritive value of hatchery by-product meal (see Wisman, 1964, for composition) in laying hen rations where up to three times as much of the by-product could be employed based on calcium content. Levels of 5, 10 and 15% hatchery by-product meal were added to a basal diet described as Diet 1 in Table 1. Complete descriptions of all diets are given including one that contained 15% poultry by-products meal and one that contained 3% condensed fish solubles. Each of the six treatment diets was randomly assigned to four groups of five DeKalb pullets maintained in…

Hatchery

Laying

10.3382/ps.0441332

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Citations (14)

A Residue and Stability Study of the Insecticide, Supracide, in the Laying Hen

Poultry Science (1970)

Ellen Wisman R. W. Young

ORGANOPHOSPHATES appear to be most promising in the search for effective insecticides that do not leave residues in eggs and tissues. Supracide, one of the newer compounds of this type, has been shown to possess insecticidal properties different from those of malathion and diazinon, however, information on its toxicity and residual effects in animals is still needed. Reported here are some observations on egg residues following oral administration of Supracide to laying hens (Experiment 1) and on stability of the insecticide in feed, egg yolk and excreta (Experiment 2). EXPERIMENT 1 Procedure. The purpose of this experiment was to determine Supracide residues in egg yolk from feeding the compound at different levels to laying hens for a 30-day period and to determine its persistence following withdrawal from the feed. Levels of 0, 10, 50, 100 and 500 p.p.m. were mixed in enough feed to last for 30 days and fed…

Yolk

Residue (chemistry)

10.3382/ps.0490083

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Citations (6)

Characterization of the FIDDLEHEAD Gene of Arabidopsis Reveals a Link between Adhesion Response and Cell Differentiation in the Epidermis

The Plant Cell (1999)

Alexander Yephremov Ellen Wisman Peter Huijser Casper Huijser Kirsten Wellesen

Epidermis (zoology)

10.2307/3871018

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Citations (10)

A MADS domain gene involved in the transition to flowering in Arabidopsis

The Plant Journal (2000)

Rony Borner Grit Kampmann John Chandler Roland R. Gleissner Ellen Wisman

Summary Flowering time in many plants is triggered by environmental factors that lead to uniform flowering in plant populations, ensuring higher reproductive success. So far, several genes have been identified that are involved in flowering time control. AGL20 ( AG AMOUS L IKE 20 ) is a MADS domain gene from Arabidopsis that is activated in shoot apical meristems during the transition to flowering. By transposon tagging we have identified late flowering agl20 mutants, showing that AGL20 is involved in flowering time control. In previously described late flowering mutants of the long‐day and constitutive pathways of floral induction the expression of AGL20 is down‐regulated, demonstrating that AGL20 acts downstream to the mutated genes. Moreover, we can show that AGL20 is also regulated by the gibberellin (GA) pathway, indicating that AGL20 integrates signals of different pathways of floral induction and might be a central component for the induction of flowering. In addition, the constitutive expression of AGL20 in Arabidopsis is sufficient for photoperiod independent flowering and the over‐expression of the orthologous gene from mustard, MADSA , in the classical short‐day tobacco Maryland Mammoth bypasses the strict photoperiodic control of flowering.

MADS-box

Vernalization

10.1046/j.1365-313x.2000.00906.x

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Citations (363)