tissue (2n 36) of the cross L . hirsutum f .   typicum (2n 48) X L . peruvianum (2n 24) . The meiotic division was abnormal as expected with aneuploids .   The stainability of the pollen was between 28 to 72 % . The obtained results show that chromosome elimination takes place during in vitro plant regeneration from somatic triploid tissue of the sesquidiploid L . hirsutum f . typicum (2n 48) X L . peruvianum (2n 24) .   In 10 (30%) of the produced regenerants the 2n (24) chromosomes of L . hirsutum f . typicum were eliminated while the   n (12) chromosomes of L . peruvianum were doubled and dihaplid L . peruvianum plants were produced . Further studies are in progress to apply this approach for the production of dihaploids from other species of genus Lycopersicon . Literature cited: 1 . Murashige T . , Skoog . 1962 . Physiol .   Plant . 15, 73 - 79 . 2 . Rick C . 1963 .   Evolution 17, 216 - 232 . 3 . Rick C . 1979 . In: Hawkes J . , Lester R . , Skelding A . (ed . ) The Biology and Taxonomy of the Solanaceae .   Acad . Press London, pp . 667 - 677 . 4 . Upadhya M . , Majid R . 1964 . Ind .   J . Genet .   Pl .   Breed . , 24, 3244 - 251 . 5 . Vulkova - Achkova Z . , Stoeva P . 1978 . Compt . Rend . Acad . Bulg . Sci . , 31,1,109 - 111 .