Secondary Metabolite Profile in Induced Tetraploids of Wild Solanum commersonii Dun.

The main aim of this work was to study the leaf secondary metabolite profiles of artificially induced tetraploids (2n4x48) of Solanum commersonii, a diploid (2n2x24) wild potato species. The tetraploid genotypes of S. commersonii were produced by oryzalin treatment. Both HPLC-UVand LC/ MS analyses revealed that there were no qualitative differences in the metabolite profiles between the diploid S. commersonii and its tetraploids. By contrast, the results showed that the phenylpropanoid content was generally significantly higher in the tetraploids than in the diploid S. commersonii. Concerning the glycoalkaloids (GAs), the results provided evidence that the content of minor GAs (solanidenediol triose, solanidadienol lycotetraose, and solanidenol lycotetraose) was higher in tetraploids than in the diploid progenitor, while the content of major GAs (dehydrodemissine and dehydrocommersonine) was significantly higher in diploid S. commersonii than in its tetraploid genotypes. The results are discussed from the practical perspective of potato biodiversity enhancement. Introduction. – The rule that somatic nuclei contain two complete sets of chromosomes is subjected to several exceptions in the plant kingdom, where species possessing more than two full sets of chromosomes are often present. This phenomenon has been referred to as polyploidy. A triploid has three sets of chromosomes,