Structure Variation And Dynamics of the Nuclear Ribosomal Intergenic Spacer Region in Key Gibberella Fujikuroi Complex Species

Mirete, Salvador and Patiño, Belén and Jurado García-Posada, Miguel and Vázquez, Covadonga and González Jaén, María Teresa (2013). Structure Variation And Dynamics of the Nuclear Ribosomal Intergenic Spacer Region in Key Gibberella Fujikuroi Complex Species. "GENOME", v. 56 ; pp. 205-213. ISSN 0831-2796.

Description

Title: Structure Variation And Dynamics of the Nuclear Ribosomal Intergenic Spacer Region in Key Gibberella Fujikuroi Complex Species
Author/s:
  • Mirete, Salvador
  • Patiño, Belén
  • Jurado García-Posada, Miguel
  • Vázquez, Covadonga
  • González Jaén, María Teresa
Item Type: Article
Título de Revista/Publicación: GENOME
Date: 2013
ISSN: 0831-2796
Volume: 56
Subjects:
Faculty: E.U.I.T. Agrícolas (UPM)
Department: Ciencia y Tecnología Aplicadas a la Ingeniería Técnica Agrícola [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

The intergenic spacer (IGS) region of the ribosomal DNA was cloned and sequenced in eight species within the Gibberella fujikuroi species complex with anamorphs in the genus Fusarium , a group that includes the most relevant toxigenic species. DNA sequence analyses revealed two categories of repeated elements: long repeats and short repeats of 125 and 8 bp, respectively. Long repeats were present in two copies and were conserved in all the species analyzed, whereas different numbers of short repeat elements were observed, leading to species-specific IGS sequences with different length. In Fusarium subglutinans and Fusarium nygamai , these differences seemed to be the result of duplication and deletion events. Here, we propose a model based on unequal crossing over that can explain these processes. The partial IGS sequence of 22 Fusarium proliferatum isolates was also obtained to study variation at the intraspecific level. The results revealed no differences in terms of number or pattern of repeated elements and detected frequent gene conversion events. These results suggest that the homogenization observed at the intraspecific level might not be achieved primarily by unequal crossing-over events but rather by processes associated with recombination such as gene conversion events.

More information

Item ID: 26572
DC Identifier: http://oa.upm.es/26572/
OAI Identifier: oai:oa.upm.es:26572
Deposited by: Memoria Investigacion
Deposited on: 05 Jun 2014 08:45
Last Modified: 22 Sep 2014 11:41
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