Auxotrophs - Auxotrophs are continuously used for DNA transformation, somatic hybridization and the study of metabolic processes. The use of haploid cell cultures and the application of effective mutagenic treatment have made the recovery of a large number of auxotrophs feasible.

Various auxotrophic mutants and variant lines selected in cell cultures. Cell lines resistant to the antibiotics streptomycin, lincomycin, kanamycin, chloramphenicol and cyclohexamide have been developed from various plant species