Genetic gain estimates using different selection index methods in three potato hybrid populationsThe objective of this study was to compare the efficiency of different selection index methods for superior potato clones. The experiment was carried out at the experimental field of Embrapa Clima Temperado in Pelotas, Rio Grande do Sul State, Brazil, in the spring season of 2008. Three hybrid populations of potato derived from crosses between advanced clones of Embrapa potato breeding program and foreign cultivars were studied. The experimental design was an augmented block with four replications. The use of selection indexes resulted in higher selection gains, with better distribution among traits. The best selection index found to be used in potato breeding programs are the multiplicative of Subandi et al. (1973) and the index based on the sum of ranks proposed by Mulamba & Mock (1978).

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ABSTRACT Colored flesh potatoes contain high concentrations of phytochemicals, such as phenolic acids, anthocyanins and carotenoids, which have therapeutic effects and promoters of human health. The objective of the study was to evaluate the concentration of bioactive compounds and industrial quality and yield traits of potato tubers. Four experiments were carried out in Pelotas-RS. In 2012 and 2013, tuber yield traits were evaluated and in 2014 and 2015, the bioactive compounds (phenolic compounds, anthocyanins and carotenoids), antioxidant activity and industrial quality traits [glucose content, dry matter (%) and frying color] were assessed. Clones C2715-01-09, C2721-22-09 and C2743-01-09, having fully pigmented purple flesh presented high concentrations of bioactive compounds and high antioxidant capacity and reasonable processing quality traits and yield potential. Clone C2743-09-09 with white flesh interspersed with purple was the most productive and had good processing attributes, but showed lower levels of bioactive compounds and moderate antioxidant activity when compared to completely purple clones.

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