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The Ca2+ pump inhibitor, thapsigargin, inhibits root gravitropism in Arabidopsis thaliana

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2006
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Urbina, Daniela C.
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The Ca2+ pump inhibitor, thapsigargin, inhibits root gravitropism in Arabidopsis thaliana
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  • Urbina, Daniela C.;
  • Silva Ascencio, Herman;
  • Lee A., Meisel;
Abstract
Thapsigargin, a specific inhibitor of most animal intracellular SERCA-type Ca2+ pumps present in the sarcoplasmic/endoplasmic reticulum, was originally isolated from the roots of the Mediterranean plant Thapsia gargancia L. Here, we demonstrate that this root-derived compound is capable of altering root gravitropism in Arabidopsis thaliana. Thapsigargin concentrations as low as 0.1 µM alter root gravitropism whereas under similar conditions cyclopiazonic acid does not. Furthermore, a fluorescently conjugated thapsigargin (BODIPY FL thapsigargin) suggests that target sites for thapsigargin are located in intracellular organelles in the root distal elongation zone and the root cap, regions known to regulate root gravitropism.
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This work was supported by research grants from the Fondo Nacional de Desarrollo Científico y Tecnológico (Fondecyt #1000812), ICM P99-031-F, ICM P02-009-F, and the Departamento de Investigación y Desarrollo de la Universidad de Chile (DID #I010-98/2).
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URI: https://repositorio.uchile.cl/handle/2250/118747
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Biol Res 39: 289-296, 2006
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