title: Mining Centuries OldIn situConserved Turkish Wheat Landraces for Grain Yield and Stripe Rust Resistance Genes.
abstract: Wheat landraces in Turkey are an important genetic resource for wheat improvement. An exhaustive 5-year (2009-2014) effort made by the International Winter Wheat Improvement Programme (IWWIP), a cooperative program between the Ministry of Food, Agriculture and Livestock of Turkey, the International Center for Maize and Wheat Improvement (CIMMYT) and the International Center for Agricultural Research in the Dry Areas (ICARDA), led to the collection and documentation of around 2000 landrace populations from 55 provinces throughout Turkey. This study reports the genetic characterization of a subset of bread wheat landraces collected in 2010 from 11 diverse provinces using genotyping-by-sequencing (GBS) technology. The potential of this collection to identify loci determining grain yield and stripe rust resistance via genome-wide association (GWA) analysis was explored. A high genetic diversity (diversity index = 0.260) and a moderate population structure based on highly inherited spike traits was revealed in the panel. The linkage disequilibrium decayed at 10 cM across the whole genome and was slower as compared to other landrace collections. In addition to previously reported QTL, GWA analysis also identified new candidate genomic regions for stripe rust resistance, grain yield, and spike productivity components. New candidate genomic regions reflect the potential of this landrace collection to further increase genetic diversity in elite germplasm.
authors.affiliation: International Center for Maize and Wheat Improvement Texcoco, Mexico.
authors.forename: Deepmala
authors.initials: D
authors.lastname: Sehgal
authors.affiliation: International Center for Maize and Wheat Improvement Texcoco, Mexico.
authors.forename: Susanne
authors.initials: S
authors.lastname: Dreisigacker
authors.affiliation: Crop Breeding Department, Transitional Zone Agricultural Research Institute Eskisehir, Turkey.
authors.forename: Savaş
authors.initials: S
authors.lastname: Belen
authors.affiliation: Crop Breeding Department, Eastern Anatolia Agricultural Research Institute Erzurum, Turkey.
authors.forename: Ümran
authors.initials: Ü
authors.lastname: Küçüközdemir
authors.affiliation: Central Field Crops Research Institute Ankara, Turkey.
authors.forename: Zafer
authors.initials: Z
authors.lastname: Mert
authors.affiliation: Crop Breeding Department, Bahri Dagdas International Agricultural Research Institute Konya, Turkey.
authors.forename: Emel
authors.initials: E
authors.lastname: Özer
authors.affiliation: Crop Pathology Department, International Center for Maize and Wheat Improvement Ankara, Turkey.
authors.forename: Alexey
authors.initials: A
authors.lastname: Morgounov
keywords: adult plant resistance; bread wheat; club wheat; genome wide association analysis; genotyping-by-sequencing