Exploring the Genetic Architecture of Root-Related Traits in Mediterranean Bread Wheat Landraces by Genome-Wide Association Analysis
Soriano, Jose Miguel
Background: Roots are essential for drought adaptation because of their involvement in water and nutrient uptake. As the study of the root system architecture (RSA) is costly and time-consuming, it is not generally considered in breeding programs. Thus, the identification of molecular markers linked to RSA traits is of special interest to the breeding community. The reported correlation between the RSA of seedlings and adult plants simplifies its assessment. Methods: In this study, a panel of 170 bread wheat landraces from 24 Mediterranean countries was used to identify molecular markers associated with the seminal RSA and related traits: seminal root angle, total root number, root dry weight, seed weight and shoot length, and grain yield (GY). Results: A genome-wide association study identified 135 marker-trait associations explaining 6% to 15% of the phenotypic variances for root related traits and 112 for GY. Fifteen QTL hotspots were identified as the most important for controlling root trait variation and were shown to include 31 candidate genes related to RSA traits, seed size, root development, and abiotic stress tolerance (mainly drought). Co-location for root related traits and GY was found in 17 genome regions. In addition, only four out of the fifteen QTL hotspots were reported previously. Conclusions: The variability found in the Mediterranean wheat landraces is a valuable source of root traits to introgress into adapted phenotypes through marker-assisted breeding. The study reveals new loci affecting root development in wheat.
633 - Cultius i produccions
Is part of
Rufo, Rubén, Silvio Salvi, Conxita Royo, and Jose Soriano. 2020. "Exploring The Genetic Architecture Of Root-Related Traits In Mediterranean Bread Wheat Landraces By Genome-Wide Association Analysis". Agronomy 10 (5): 613. doi:10.3390/agronomy10050613.
Grant agreement number
MINECO/Programa Estatal de I+D+I orientada a los retos de la sociedad/AGL 2015-65351-R/HERRAMIENTAS PARA LA SELECCION ASISTIDA POR MARCADORES EN PROGRAMAS DE MEJORA DE TRIGO A ESCALA NACIONAL E INTERNACIONAL: ADAPTACION AL CAMBIO CLIMATICO Y CALIDAD INDUSTRIAL/
INIA/Programa Estatal de I+D+I orientada a los retos de la sociedad/RTA2015-00072-C03-01/ES/Mejora genética del trigo para hacer frente a los retos actuales del cultivo en España: adaptación al cambio climático, calidad y resistencia a estreses bióticos/
Cultius Extensius Sostenibles
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- ARTICLES CIENTÍFICS 
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