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Genetic differentiation of Slovenian sweet potato varieties (Ipomoea batatas) and effect of different growing media on their agronomic and nutritional traits

Lovro Sinkovič, Barbara Pipan, Vladimir Meglič, Nataša Kunstelj, Marijan Nečemer, Emil Zlatić, Dragan Žnidarčič
  • Lovro Sinkovič
    Crop Science Department, Agricultural Institute of Slovenia, Ljubljana, Slovenia
  • Barbara Pipan
    Crop Science Department, Agricultural Institute of Slovenia, Ljubljana, Slovenia
  • Vladimir Meglič
    Crop Science Department, Agricultural Institute of Slovenia, Ljubljana, Slovenia
  • Nataša Kunstelj
    Biotechnical Centre Naklo, Naklo, Slovenia
  • Marijan Nečemer
    Department of Low and Medium Energy Physics, “Jožef Stefan” Institute, Ljubljana, Slovenia
  • Emil Zlatić
    Department of Food Science and Technology, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia

Abstract

The objectives of the present study were firstly to analyse the genetic relatedness among three Slovenian sweet potato varieties; and secondly to assess the effects of different growing media on selected agronomic and nutritional traits of these varieties. Tubers of three varieties ('Lučka', 'Janja', 'Martina') with different skin/flesh colour were produced in planters under glasshouse conditions in five different growing media (perlite, peat, expanded clay, vermiculite, garden soil) from prior raised seedlings. Genetic analysis was performed using a set of eight SSR markers. According to Nei’s genetic distance and pairwise population Fst analysis, the most related varieties are 'Janja' and 'Martina'; in contrast, 'Lučka' and 'Martina' show the weakest geneticrelationships. The following agronomic traits were evaluated: vine length, thickness of vine-base, number of branches, weight of above ground part, number of leaves plant-1, number of tubers plant-1 and tubers weight plant-1. Between nutritional traits total phenolic content (TPC), antioxidant potential (AOP) and ascorbic acid content (AA) were determined in the range: 36.2 to 65.1 mg GAE 100g-1 FW, 0.18 to 0.56 mg TE g-1 FW and 13.7 to 23.5 mg 100g-1 FW, respectively. Significant interactions of growing media (factor A) × variety (factor B) were observed for thickness of vine-base, weight of above ground part, AOP, TPC and AA. Overall, results showed variation in varieties response to growing media. Growing media provide a discriminant classification of the sweet potato varieties according to their agronomic and nutritional traits.

Keywords

Growing media; genetic analysis; Ipomoea batatas; phenolic compounds

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Submitted: 2017-02-28 10:30:35
Published: 2017-09-01 12:05:58
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Copyright (c) 2017 Dragan Žnidarčič, Lovro Sinkovič, Barbara Pipan, Vladimir Meglič, Nataša Kunstelj, Marijan Nečemer, Emil Zlatić

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