Abstract
Potatoes contain antioxidants such as flavonoids, carotenoids and ascorbic acid. High level consumption worldwide makes potato a valuable source of phytonutrients. Developing new potato varieties with high nutritional value in combination with resistance to pathogens is an important task. In this study, 25 interspecific potato hybrids with resistance to Synchytrium endobioticum, common scab, silver scab, rhizoctonia, nematodes and PVY were evaluated for total phenolics, total flavonoids, total carotenoids, ascorbic acid contents and antioxidant activity. The identification of the dominant allele related with yellow flesh color at the Chy locus was also performed by the specific CAPS marker. Total protein content was detected and ranged from 8.19 ± 0.59 to 30.17 ± 4.56 mg/g dry weight (DW). Total starch and total carbohydrate contents were in the range of 9.0–21.0% and 73.21 ± 20.94–676.36 ± 195.28, respectively. Total phenolic content of hybrids varied from 8.45 to 82.75 mg/100 g, and total flavonoids content—from 0.64 to 9.67 mg/100 g DW. It is possible to distinguish samples with high protein and carbohydrate contents, high level of substances with antioxidant activity and characterized by resistance to pathogens. Quality evaluation has shown that some of the samples have a high potential for processing and chip production in combination with high eating qualities. These samples can be used in breeding programs to develope varieties resistant to pathogens and with high nutritional value.
Highlights
Phenolic compounds are plants’ secondary metabolites associated with protection mechanisms against pathogens and pests, defense against radiation and attraction of pollinators signaling [1,2]
The aim of this study was to estimate the amount of total phenolics, total flavonoids, total carotenoids, ascorbic acid, low molecular soluble antioxidant and protein contents of 25 potato hybrids, which were previously selected based on pathogen resistance, yield, tuber shape and other economic traits
Among North and South American species, such as S. andigenum Juz. et Buk., S. chacoense Bitt., S. microdontum Bitt., S. phureja Juz. et Buk., S. pinnatisectum Dun., S. rybinii Juz. et Buk., S. spegazzinii Bitt. and S. stoloniferum Schlechtd., which have already presented in the pedigrees of modern varieties, valuable genotypes were selected for use in hybridization
Summary
Phenolic compounds are plants’ secondary metabolites associated with protection mechanisms against pathogens and pests, defense against radiation and attraction of pollinators signaling [1,2]. Phenolics demonstrate antioxidant activity along with other plant chemical compounds presented in plant foods. Carotenoids, ascorbic acid and vitamin E can neutralize reactive oxygen species (ROS) which cause damage to cell structures and are linked with some cancer types and cardiovascular diseases [3]. Potato (Solanum tuberosum L.) is the most widely available source of vitamins, minerals and phytonutrients due to the high level of consumption worldwide. Potatoes can be a good source of phenolic compounds especially phenolic acids such as chlorogenic acid, flavonoids (mainly quercetin) and anthocyanins. Carotenoids are present in potatoes, especially in varieties with orange or yellow flesh. The level of phytonutrients with antioxidant activity in potatoes can vary greatly and depend on the variety, growth conditions and environment factors [4]
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