Observatorio de I+D+i UPM

Memorias de investigación
Communications at congresses:
MtMTP2 is a zinc transporter required for symbiotic nitrogen fixation in Medicago truncatula
Year:2017
Research Areas
  • Molecular, cellular and genetic biology,
  • Microbiology
Information
Abstract
Zinc (Zn) is a key element in the structure and catalytic activitiy of a large amount of proteins (1), including many involved in Symbiotic Nitrogen Fixation (SNF) (2). Although much is known about Zn transport and delivery in plants, few studies have focused on how this is achieved in legume nodules. There are three mayor protein families involved in the Zn transport in plants: ZIP, P1b-2ATPases and CDF transporters (3). Characterization of the Zn Medicago truncatula transcriptome showed high expression level of CDF transporter MtMTP2 in nodules. Yeast complementation tests showed that MtMTP2 exports Zn out of the cytosol. To test where MtMTP2 expression is located, ß-glucuronidase activity was determined in M. truncatula plants expresing the gus gene under the MtMTP2 promoter. GUS signal was detected in the differenciation, interzone and fixation zones. Immunolocation studies indicate that MtMTP2 was located in the plasma membrane of non-infected nodule cells and in an intracellular compartment in rhizobia-infected cells. Under symbiotic conditions, the mtp2-1 and mtp2- 2 mutants exhibited reduced growth and nitrogenase activity compared to the wild type, but not when mineral nitrogen was provided in nutritive solution. These data indicates an important role of MtMTP2 in the Zn homeostasis in SNF.
International
Si
Congress
International Congress on Nitrogen Fixation
970
Place
Reviewers
Si
ISBN/ISSN
0000000000
Start Date
03/09/2017
End Date
07/09/2017
From page
163
To page
163
International Congress on Nitrogen Fixation
Participants
  • Autor: Javier Leon Mediavilla (UPM)
  • Autor: Marta Senovilla Ramos (UPM)
  • Autor: Patricia Gil Diez (UPM)
  • Autor: Manuel Gonzalez Guerrero (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: BIOLOGÍA MOLECULAR Y COMPUTACIONAL
  • Centro o Instituto I+D+i: Centro de Biotecnología y Genómica de Plantas, CBGP
  • Departamento: Biotecnología - Biología Vegetal
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