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Association mapping for kernel phytosterol content in almond

AutorFont i Forcada, Carolina ; Velasco Varo, Leonardo ; Socias i Company, Rafel; Fernández i Martí, Ángel
Palabras clavePrunus amygdalus
Genetic variability
Sterol content
Population structure
Linkage disequilibrium
SSR markers
Candidate genes
Fecha de publicación9-jul-2015
EditorFrontiers Media
CitaciónFrontiers in Plant Science 6: 530 (2015)
ResumenAlmond kernels are a rich source of phytosterols, which are important compounds for human nutrition. The genetic control of phytosterol content has not yet been documented in almond. Association mapping (AM), also known as linkage disequilibrium (LD), was applied to an almond germplasm collection in order to provide new insight into the genetic control of total and individual sterol contents in kernels. Population structure analysis grouped the accessions into two principal groups, the Mediterranean and the non-Mediterranean. There was a strong subpopulation structure with LD decaying with increasing genetic distance, resulting in lower levels of LD between more distant markers. A significant impact of population structure on LD in the almond cultivar groups was observed. The mean r2-value for all intra-chromosomal loci pairs was 0.040, whereas, the r2 for the inter-chromosomal loci pairs was 0.036. For analysis of association between the markers and phenotypic traits five models were tested. The mixed linear model (MLM) approach using co-ancestry values from population structure and kinship estimates (K model) as covariates identified a maximum of 13 significant associations. Most of the associations found appeared to map within the interval where many candidate genes involved in the sterol biosynthesis pathway are predicted in the peach genome. These findings provide a valuable foundation for quality gene identification and molecular marker assisted breeding in almond.
Versión del editorhttps://doi.org/10.3389/fpls.2015.00530
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