Search results for "Arabidopsi"
showing 10 items of 241 documents
Etude du système de perception des chito--oligosaccharides chez la vigne et rôle dans l'immunité.
2014
Rapport de stage Master II R SPE IPM; Master
Establishment of tools for investigating pyoverdine impact on iron homeostasis and plant defense responses
2013
Iron, the fourth major element in the Earth crust, is essential for growth and development of living organisms. However, due to its low solubility in the soil, it is weakly available for plants and micro-organisms. To efficiently assimilate iron, living organisms have evolved specific strategies. In plants such as Arabidopsis thaliana three trans-membrane proteins are involved in iron assimilation while in bacteria such as Pseudomonas fluorescens iron is taken up from the soil thanks to molecules displaying high affinity for iron called siderophores. It has been recently shown that pyoverdine, the major siderophore of the beneficial bacterium Pseudomonas fluorescens, is assimilated by A. th…
Characterization of the role of flagellin in the innate immunity triggered by the endophytic pgpr burkholderia phytofirmans in arabidopsis and grapev…
2014
International audience
Analysis of the cross‐regulation between immunity, growth and iron homeostasis in plants
2019
The existence of a tightly regulated balance between growth and immunity in plants has recently emerged. In this study, we challenged this concept thanks to the biological model pyoverdine-Arabidopsis thaliana. Pyoverdine is a siderophore produced by the plant growth promoting rhizobacteria Pseudomonas fluorescens C7R12. Under iron deficiency, P. fluorescens excretes the iron free form of pyoverdine (apo‐pyo) in the soil. Once chelated with iron (ferri‐pyo), the complex is internalized by the bacteria. We demonstrated that Arabidopsis thaliana plants treated by apo‐pyo in a medium containing or not iron internalize pyoverdine. Interestingly, apo‐pyo-treated plants did not show a typical gro…
The plant resistance inducer β-aminobutyric acid (BABA) induces an iron deficiency response in A. thaliana
2012
β-aminobutyric acid (BABA) is a well-known plant resistance inducer. However, the molecular mechanisms underlying its effects are poorly understood. In the present study, we investigated whether BABA could act through the modification of iron homeostasis in Arabidopsis thaliana. Supporting this assumption, we obtained first evidences that BABA chelates iron with high affinity. We showed that pre-treatment of plants with BABA induced a drastic but transient iron deficiency response. Quantification of iron indicated that this response is related to the perturbation of iron distribution/availability rather than a reduction of iron assimilation. Finally, we provided evidence that the iron defic…
Sulfate transporters in the plant’s response to drought and salinity: regulation and possible functions
2014
International audience; Drought and salinity are two frequently combined abiotic stresses that affect plant growth, development, and crop productivity. Sulfate, and molecules derived from this anion such as glutathione, play important roles in the intrinsic responses of plants to such abiotic stresses. Therefore, understanding how plants facing environmental constraints re-equilibrate the flux of sulfate between and within different tissues might uncover perspectives for improving tolerance against abiotic stresses. In this review, we took advantage of genomics and post-genomics resources available in Arabidopsis thaliana and in the model legume species Medicago truncatula to highlight and …
Identificación de dianas e interactores de TFL1, un regulador clave en la floración y la arquitectura de la inflorescencia
2020
La transición de la fase vegetativa a la reproductiva, también conocida como transición floral, es un paso crítico en ciclo de vida de las plantas, por lo que se encuentra finamente regulada por una compleja red genética que responde a factores tanto endógenos como ambientales. El gen TFL1, y su homólogo FT, son dos de los reguladores claves de la transición floral. Ambos codifican para proteínas del tipo PEBP (Phosphatidil Ethanolamine Binding Proteins) y, aunque no son factores de transcripción, ambos son capaces de regular la expresión de los genes responsables de la iniciación floral. Sin embargo, el modo de acción de TFL1 como regulador transcripcional no se conoce con detalle. Se ha p…
Generation of a toolbox for the study of carpel and fruit development in Brassicaceae
2019
Los carpelos y los frutos son las innovaciones evolutivas clave de las angiospermas. Los carpelos facilitan la polinización y, después de la fertilización, se transforman en frutos, que protegen las semillas en desarrollo y ayudan a su dispersión. Para cumplir estas funciones, los carpelos y los frutos diferencian tejidos altamente especializados que forman órganos complejos que se han diversificado enormemente en las plantas con flores. La mayor parte del conocimiento sobre las bases moleculares de la morfogénesis del carpelo y del fruto proviene de estudios genéticos en la especie modelo Arabidopsis thaliana, miembro de la familia Brassicaceae. Se han propuesto redes complejas de regulaci…
Evolución de virus en huéspedes con susceptibilidad variable: consecuencias en eficacia y virulencia
2020
Los virus de RNA se encuentran entre los patógenos emergentes más abundantes. Durante su ciclo de vida normal, los virus se mueven de un huésped a otro, a veces transmitidos por el aire o el agua, pero a veces utilizando vectores en los que también pueden replicarse. Dentro de un huésped individual, los virus se enfrentan a múltiples tejidos y tipos de células que difieren en propiedades fisiológicas y bioquímicas y son constantemente desafiados por una variedad de respuestas inmunes antivirales. Para maximizar su fitness, los virus deben adaptarse necesariamente a todos estos factores. En la mayoría de los casos, esta adaptación se produce fácilmente debido a su enorme potencial evolutivo.…
Screening for Solute Transporters in Plant Photosynthetic Membranes
2008
As compared to chloroplast envelope transporters, the field of thylakoid transporters is largely unexplored. There is evidence for several transport activities in the plant thylakoid membrane, but only a copper P-type ATPase and an ATP/ADP carrier have been so far identified at the gene level in Arabidopsis thaliana. Using in silico analyses, we have predicted the existence of approximately 15 thylakoid transporters, including phosphate transporters and cation channels. For experimental validation, we have used peptide- specific antibodies and functional analyses in heterologous system. These novel data are highly relevant to understand the transport network of the thylakoid membrane and it…