These fertile hybrids were back crossed to cultivated species followed by screening fur economic traits like drought and insect resistance (transferred from Eruca), pathogen resistance (transferred from Sinapis), cytoplasmic male sterility or CMS (transferred from Diplotaxis), cold tolerance (from Barborea), and high concentration of nervonic acid, a lubricant (from Thalspi).
Symmetric hybrids between tomato and potato, produced by protoplast fusion, have been shown to exhibit intermediate cold tolerance. In., another example, substitution of Solanum acaule genome into S. tuberosum resulted in an appreciable increase of frost resistance.
