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Genetic mapping of stem rust resistance in Durum Wheat cultivar 'Arrivato'

By: Contributor(s): Material type: ArticleArticleLanguage: En Publication details: 2008ISSN:
  • 1752-3478
 In: International Journal of Plant Breeding v. 2, no. 1, p. 23-26Summary: Genetic analysis of seedling stem rust resistance in the durum wheat cultivar ?Arrivato? indicated the presence of three independent genes. Replicated tests on F3 families derived from ?Arrivato?/?Bansi Strain 168?, putatively segregating at a single locus, were performed to confirm monogenic segregations. These families represented three distinct infection types, viz., IT;1, IT2= and ITX and the genes conditioning these different phenotypic expressions were temporarily named SrAr1, SrAr2 and SrAr3, respectively. Up to 100 plants from at least one family representing segregation for each distinct infection type were grown and harvested individually. These monogenically segregating populations were progeny tested. Bulked segregant analyses were conducted and SrAr1 was mapped 0.7cM proximal to Xgwm47 in thechromosome 2BL. SrAr2 mapped 5.7cM distal to Xwmc59 in the long arm of chromosome 6A, whereas SrAr3 showed genetic association (4.6cM) with Xgwm334 in chromosome 6AS. Based on combinations of infection type with genomic locations and/or pathogenic specificities of previously characterized stem rust resistance genes SrAr1, SrAr2 and SrAr3 were concluded to be Sr9e, Sr13 and Sr8b, respectively.
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Peer-review: No - Open Access: Yes|http://www.globalsciencebooks.info/Journals/images/IJPBDescripStyle.pdf

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Genetic analysis of seedling stem rust resistance in the durum wheat cultivar ?Arrivato? indicated the presence of three independent genes. Replicated tests on F3 families derived from ?Arrivato?/?Bansi Strain 168?, putatively segregating at a single locus, were performed to confirm monogenic segregations. These families represented three distinct infection types, viz., IT;1, IT2= and ITX and the genes conditioning these different phenotypic expressions were temporarily named SrAr1, SrAr2 and SrAr3, respectively. Up to 100 plants from at least one family representing segregation for each distinct infection type were grown and harvested individually. These monogenically segregating populations were progeny tested. Bulked segregant analyses were conducted and SrAr1 was mapped 0.7cM proximal to Xgwm47 in thechromosome 2BL. SrAr2 mapped 5.7cM distal to Xwmc59 in the long arm of chromosome 6A, whereas SrAr3 showed genetic association (4.6cM) with Xgwm334 in chromosome 6AS. Based on combinations of infection type with genomic locations and/or pathogenic specificities of previously characterized stem rust resistance genes SrAr1, SrAr2 and SrAr3 were concluded to be Sr9e, Sr13 and Sr8b, respectively.

Global Wheat Program

English

No CIMMYT affiliation

Carelia Juarez

INT2843

Reprints Collection


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