Abstract
Potatoes are an important staple food worldwide and are the third main source of antioxidants in the human diet. One of the most important antioxidant compounds in potatoes is the anthocyanin pigments. Some reports indicate a high positive correlation between color intensity, anthocyanins content, and antioxidant level in potato tubers. The variation in anthocyanins composition and content in potato tubers among diverse germplasm sources has important nutritional and health implications and constitutes an interesting trait for potato breeding programs focused on enhancing the anthocyanin and antioxidant contents of potato materials. We identified and quantified five anthocyanidins (delphinidin, cyanidin, petunidin, pelargonidin, and peonidin) on tubers from the Colombian germplasm collection of Solanum tuberosum L. Group Phureja. The phenotypic data were merged into a genome-wide association study in order to identify genomic regions associated with the nutritional compounds’ variation in potatoes. The association was conducted using a 7520 single nucleotide polymorphisms markers matrix. Seven quantitative trait loci were identified. Chromosomes I and X harbored the most stable quantitative trait loci (QTL). Three quantitative trait loci were identified close to previously reported genes involved in the regulation of anthocyanins in potato tubers. The genomic regions of these QTL reveal presumptive candidate genes as genetic factors that are the basis for a better understanding of the genetic architecture of the regulation of nutritional compounds in potatoes.
Highlights
Potato (Solanum tuberosum L.) is a basic non-cereal crop worldwide [1] and constitutes the third most important source of antioxidants in human diets [2,3], it plays an important role in food security and nutrition around the world [4,5]
The in aa potato potatoassociation associationpanel panelconstituted constituted accessions of diploid potatoes of Group anthocyanidins eluted at retention timestimes ranging from from 6 to 16 min: at 8.07atmin, The anthocyanidins eluted at retention ranging
We reported the identification and quantification of five anthocyanidins in cooked tubers of diploid potatoes belonging to the Colombian germplasm of Solanum tuberosum Group Phureja
Summary
Potato (Solanum tuberosum L.) is a basic non-cereal crop worldwide [1] and constitutes the third most important source of antioxidants in human diets [2,3], it plays an important role in food security and nutrition around the world [4,5]. Group Phureja, a cultivated potato group, which is mainly comprised of diploid genotypes, contains higher nutritional value than other potato species [8,9,10] These potatoes possess a wide variability in important nutritional traits, flesh and skin colors from yellow to purple [8,11,12,13], and contain health-promoting compounds such as polyphenols, including anthocyanins, and carotenoids [14,15,16,17]. There has been an increasing interest in potatoes with red and purple flesh or skin, and they have attracted the attention of researchers, as well as consumers, due to their antioxidant. Given the substantial variation of levels of anthocyanins in tubers [22,31,32,33,34] from potato landraces, it should be possible to exploit this genetic diversity using marker-assisted selection programs that target specific anthocyanins
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