Título
Genome-wide association mapping for leaf tip necrosis and pseudo-black chaff in relation to durable rust resistance in wheat
Autor
Philomin Juliana
Jessica Rutkoski
Jesse Poland
Ravi Singh
Mark Sorrells
Nivel de Acceso
Acceso Abierto
Materias
Resumen o descripción
The partial rust resistance genes lr34 and sr2 have been used extensively in wheat (triticum aestivum l.) improvement, as they confer exceptional durability. Interestingly, the resistance of lr34 is associated with the expression of leaf tip necrosis (ltn) and sr2 with pseudo-black chaff (pbc). Genome-wide association mapping using cimmyt’s stem rust resistance screening nursery (srrsn) wheat lines was done to identify genotyping-by-sequencing (gbs) markers linked to ltn and pbc. Phenotyping for these traits was done in ithaca, new york (fall 2011); njoro, kenya (main and off-seasons, 2012), and wellington, india (winter, 2013). Using the mixed linear model (mlm), 18 gbs markers were significantly associated with ltn. While some markers were linked to loci where the durable leaf rust resistance genes lr34 (7ds), lr46 (1bl), and lr68 (7bl) were mapped, significant associations were also detected with other loci on 2bl, 5b, 3bs, 4bs, and 7bs. Twelve gbs markers linked to the sr2 locus (3bs) and loci on 2ds, 4al, and 7ds were significantly associated with pbc. This study provides insight into the complex genetic control of ltn and pbc. Further efforts to validate and study these loci might aid in determining the nature of their association with durable resistance.
Fecha de publicación
2015
Tipo de publicación
Artículo
Recurso de información
Formato
application/pdf
Idioma
Inglés
Audiencia
Investigadores
Repositorio Orígen
Repositorio Institucional de Publicaciones Multimedia del CIMMYT
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