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17 juin 2019: 1 événement

  • Département Biologie Cellulaire

    Lundi 17 juin 11:00-12:00 - Hannetz ROSCHZTTARDTZ - Université de Santiago, Chili


    Résumé : Increased iron content in seeds is an important agronomic trait. This is due to the relevance of this element in seed production, embryo development, and seedling germination and growth, as well as in human nutrition. Seeds accumulate iron during embryo maturation stages of embryogenesis. Using Arabidopsis thaliana as model plant, it has been described that mature embryos accumulate iron within a specific cell layer, the endodermis. This distribution pattern was conserved in most of the analyzed members from Brassicales, with the exception of basal Vasconcellea pubescens that also showed elevated amounts of iron in cortex cells. To determine whether the V. pubescens iron distribution was indicative of a wider pattern in non-Brassicales Eudicotyledoneae, we studied iron distribution pattern in different embryos belonging to plant species from different Orders from Eudicotyledoneae and one basal from Magnoliidae. The results indicate that iron distribution in A. thaliana embryo is an extreme case of apomorphic character found in Brassicales, not-extensive to the rest of Eudicotyledoneae.
    Main publications :
    - Ibeas MA, Grant-Grant S, Coronas MF, Vargas-Perez JI, Navarro N, Abreu I, Castillo-Michel H, Avalos-Cembrano N, Paez Valencia J, Perez F, Gonzalez-Guerrero M, Roschzttardtz H (2018) The Diverse Iron Distribution in Eudicotyledoneae Seeds : From Arabidopsis to Quinoa. Front Plant Sci 9 : 1985
    - Tissot N, Robe K, Gao F, Grant-Grant S, Boucherez J, Bellegarde F, Maghiaoui A, Marcelin R, Izquierdo E, Benhamed M, Martin A, Vignols F, Roschzttardtz H, Gaymard F, Briat JF, Dubos C (2019) Transcriptional integration of the responses to iron availability in Arabidopsis by the bHLH factor ILR3. New Phytol. doi : 10.1111/nph.15753
    - Spitzer C, Li F, Buono R, Roschzttardtz H, Chung T, Zhang M, Osteryoung KW, Vierstra RD, Otegui MS (2015) The endosomal protein CHARGED MULTIVESICULAR BODY PROTEIN1 regulates the autophagic turnover of plastids in Arabidopsis. Plant Cell 27 : 391-402
    - Roschzttardtz H, Paez-Valencia J, Dittakavi T, Jali S, Reyes FC, Baisa G, Anne P, Gissot L, Palauqui JC, Masson PH, Bednarek SY, Otegui MS (2014) The VASCULATURE COMPLEXITY AND CONNECTIVITY gene encodes a plant-specific protein required for embryo provasculature development. Plant Physiol 166 : 889-902
    - Roschzttardtz H, Seguela-Arnaud M, Briat JF, Vert G, Curie C (2011) The FRD3 citrate effluxer promotes iron nutrition between symplastically disconnected tissues throughout Arabidopsis development. Plant Cell 23 : 2725-2737
    - Roschzttardtz H, Grillet L, Isaure MP, Conejero G, Ortega R, Curie C, Mari S (2011) Plant cell nucleolus as a hot spot for iron. J Biol Chem 286 : 27863-27866
    - Roschzttardtz H, Conejero G, Curie C, Mari S (2009) Identification of the endodermal vacuole as the iron storage compartment in the Arabidopsis embryo. Plant Physiol 151 : 1329-1338
    - Roschzttardtz H, Fuentes I, Vasquez M, Corvalan C, Leon G, Gomez I, Araya A, Holuigue L, Vicente-Carbajosa J, Jordana X (2009) A nuclear gene encoding the iron-sulfur subunit of mitochondrial complex II is regulated by B3 domain transcription factors during seed development in Arabidopsis. Plant Physiol 150 : 84-95

    Lieu : Bibliothèque - bâtiment 34 - campus de Gif-sur-Yvette

    En savoir plus : Département Biologie Cellulaire