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Volume 0, Issue 0 (ARTICLES IN PRESS 2024)
Abstract
Sweet potato is one of the most important root crop worldwide. This study aimed to compare agro-morphological characteristics of four sweet potato varieties (Martina, Janja, Lučka, Purple Speclet) from organic farming with additional information about their genetic background. A total of 26 agro-morphological traits were evaluated during vegetation. Pre-grown seedlings were planted in organic fields during the 2021 growing season using the soil ridge cultivation method. The study showed significant differences between varieties in quantitative (except for the extent and intensity of anthocyanin colouration on abaxial veins) and qualitative traits (except for the number and length of primary shoots and internode diameter). The varieties Lučka and Martina proved to be significantly higher yielding compared to the other two varieties. The genetic background of the varieties was evaluated on 8 SSR loci using allele polymorphisms with a total number of 34 different alleles and an average polymorphic information content of 0.60. The favourable informativeness of the selected markers was confirmed by the global genetic diversity of 0.68. The assignment of each genotype to two genetic groups agrees well with the varietal distribution in the phylogenetic tree and the results of the analysis of the genetic structure (Martina/Janja and Lučka/Purple Speclet). The present study contributes to a better knowledge of the sweet potato varieties considered and their agro-morphological and genetic diversity.
Volume 19, Issue 5 (9-2017)
Abstract
The objectives of the study were to investigate the genetic relationships of sweetpotato [Ipomoea batatas (L.) Lam] genotypes, acquired from different origins and to evaluate the genetic relations among them,using eight SSR markers. A high level of polymorphism was found, with an average of 7.5 alleles per SSR locus. High average values of Shannon’s information index (0.864) and expected heterozygosity (0.739) revealed high level of genetic diversity of the Sweetpotato genotypes. Favorable applicability and informativity of selected set of SSR markers was confirmed by high global polymorphic information content (0.690) and low probability of genotype identity (1.4×10-8). The overall fixation index was negative (-0.562), reflecting excess of heterozygosity, due to negative assortative selection as a consequence of vegetative propagation of sweetpotato. Estimation of Rst based on AMOVA shows 23% of molecular variance; the first two coordinates of PCoA cumulatively explaining 62.33% of genetic variability. The assignment of individual genotypes into three genetic groups is highly concordant with the PCoA and Bayesian approach in Structure analysis. Our results suggest that selection and breeding can also improve genetic potential and increase genetic uniformity in sweetpotato. Evaluation of genetic background and relationships among and within genotypes provided baseline data for introduction, management, production and conservation of sweetpotato germplasm, regarding its favorable consumer acceptance in Central Europe.
