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Major Novel QTL for Resistance to Cassava Bacterial Blight Identified through a Multi-Environmental Analysis.
Soto Sedano, Johana C; Mora Moreno, Rubén E; Mathew, Boby; Léon, Jens; Gómez Cano, Fabio A; Ballvora, Agim; López Carrascal, Camilo E.
Afiliação
  • Soto Sedano JC; Manihot Biotec Laboratory, Biology Department, Universidad Nacional de ColombiaBogotá, Colombia.
  • Mora Moreno RE; Manihot Biotec Laboratory, Biology Department, Universidad Nacional de ColombiaBogotá, Colombia.
  • Mathew B; Institute of Crop Science and Resource Conservation-Plant Breeding, University of BonnBonn, Germany.
  • Léon J; Institute of Crop Science and Resource Conservation-Plant Breeding, University of BonnBonn, Germany.
  • Gómez Cano FA; Manihot Biotec Laboratory, Biology Department, Universidad Nacional de ColombiaBogotá, Colombia.
  • Ballvora A; Institute of Crop Science and Resource Conservation-Plant Breeding, University of BonnBonn, Germany.
  • López Carrascal CE; Institute of Crop Science and Resource Conservation-Plant Breeding, University of BonnBonn, Germany.
Front Plant Sci ; 8: 1169, 2017.
Article em En | MEDLINE | ID: mdl-28725234
Cassava, Manihot esculenta Crantz, has been positioned as one of the most promising crops world-wide representing the staple security for more than one billion people mainly in poor countries. Cassava production is constantly threatened by several diseases, including cassava bacterial blight (CBB) caused by Xanthomonas axonopodis pv. manihotis (Xam), it is the most destructive disease causing heavy yield losses. Here, we report the detection and localization on the genetic map of cassava QTL (Quantitative Trait Loci) conferring resistance to CBB. An F1 mapping population of 117 full sibs was tested for resistance to two Xam strains (Xam318 and Xam681) at two locations in Colombia: La Vega, Cundinamarca and Arauca. The evaluation was conducted in rainy and dry seasons and additional tests were carried out under controlled greenhouse conditions. The phenotypic evaluation of the response to Xam revealed continuous variation. Based on composite interval mapping analysis, 5 strain-specific QTL for resistance to Xam explaining between 15.8 and 22.1% of phenotypic variance, were detected and localized on a high resolution SNP-based genetic map of cassava. Four of them show stability among the two evaluated seasons. Genotype by environment analysis detected three QTL by environment interactions and the broad sense heritability for Xam318 and Xam681 were 20 and 53%, respectively. DNA sequence analysis of the QTL intervals revealed 29 candidate defense-related genes (CDRGs), and two of them contain domains related to plant immunity proteins, such as NB-ARC-LRR and WRKY.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Front Plant Sci Ano de publicação: 2017 Tipo de documento: Article País de afiliação: Colômbia País de publicação: Suíça
Texto completo
Adicionar na Minha BVS
Imprimir
XML
PubMed Links
Buscar no Google

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Front Plant Sci Ano de publicação: 2017 Tipo de documento: Article País de afiliação: Colômbia País de publicação: Suíça