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Identification of QTLs for resistance to Septoria tritici blotch in durum wheat through association mapping

By: Contributor(s): Material type: TextTextPublication details: Mexico, DF (Mexico) CIMMYT : 2011Description: p. 62ISBN:
  • 978-970-648-180-1
Summary: Septoria tritici blotch, caused by the fungus Mycosphaerella graminicola has been an important yield-limiting factor for durum wheat in North Africa and has recently spread around the Mediterranean Basin. The high genome plasticity of the pathogen and its specialization features (differential pathogenicity towards durum and bread wheat) hinder the identification and exploitation of resistance genes across diverse growing areas. The genetic variation of the response to M. graminicola and the chromosomal location of resistance factors were studied in a durum wheat panel of 183 accessions of diverse origin suitable for association mapping. Phenotypic evaluation of the panel was conducted in the field in four environments: Béja in Tunisia (2008, 2009 and 2010), Toluca in the Mexican highlands, Argelato and Ferrara in Italy, using local isolates. Additional phenotypic evaluation was conducted under controlled conditions at the seedling stage by inoculation with ten isolates from durum wheat collected from various Mediterranean countries. The panel was genotyped with 300 mapped SSR and some 900 durum wheat DArT markers. Significant marker-trait associations involving specific chromosomal regions have been detected using both field data (infection score at peak epidemics) and seedling assay data (percentages necrosis and pycnidia on primary leaves). Significant marker-septoria reaction associations related to photoperiod/vernalization genes (Italy) or height genes (Tunisia) were detected, but were not the only ones. A region on 1BL was found to include gene(s) related to resistance to both Tunisian and Italian field isolates. Most other associations were country specific. A preliminary analysis highlighted some chromosome regions consistently involved in resistance to Septoria tritici blotch in bread wheat, particularly in chromosomes 1BL, 2AL and 4AL that accounted for a sizeable portion of phenotypic variation among this panel. The detailed results will be presented and discussed.
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Conference proceedings CIMMYT Knowledge Center: John Woolston Library CIMMYT Staff Publications Collection CIS-6548 (Browse shelf(Opens below)) Available
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Abstract only

Septoria tritici blotch, caused by the fungus Mycosphaerella graminicola has been an important yield-limiting factor for durum wheat in North Africa and has recently spread around the Mediterranean Basin. The high genome plasticity of the pathogen and its specialization features (differential pathogenicity towards durum and bread wheat) hinder the identification and exploitation of resistance genes across diverse growing areas. The genetic variation of the response to M. graminicola and the chromosomal location of resistance factors were studied in a durum wheat panel of 183 accessions of diverse origin suitable for association mapping. Phenotypic evaluation of the panel was conducted in the field in four environments: Béja in Tunisia (2008, 2009 and 2010), Toluca in the Mexican highlands, Argelato and Ferrara in Italy, using local isolates. Additional phenotypic evaluation was conducted under controlled conditions at the seedling stage by inoculation with ten isolates from durum wheat collected from various Mediterranean countries. The panel was genotyped with 300 mapped SSR and some 900 durum wheat DArT markers. Significant marker-trait associations involving specific chromosomal regions have been detected using both field data (infection score at peak epidemics) and seedling assay data (percentages necrosis and pycnidia on primary leaves). Significant marker-septoria reaction associations related to photoperiod/vernalization genes (Italy) or height genes (Tunisia) were detected, but were not the only ones. A region on 1BL was found to include gene(s) related to resistance to both Tunisian and Italian field isolates. Most other associations were country specific. A preliminary analysis highlighted some chromosome regions consistently involved in resistance to Septoria tritici blotch in bread wheat, particularly in chromosomes 1BL, 2AL and 4AL that accounted for a sizeable portion of phenotypic variation among this panel. The detailed results will be presented and discussed.

Genetic Resources Program|Global Wheat Program

English

Lucia Segura

INT2585|CCJL01

CIMMYT Staff Publications Collection


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