The cross Comet x  L. cheesmanii typ.,  between  the two species of the genus Lycopersicon, studied by us, which in our conditions showed 40-55% fruit setting, when using irradiated pollen for crosses showed a considerable increasing of crossability between them. Analogical results were obtained in the cross with the species L. hirsutum f. glabratum. The work on overcoming the incrossability by pollen irradiation is going on. Daskaloff, Chr., M. Konstantinova, and K. Moinova Inheritance of lycopin content in tomato fruits of diallel cross. In connection with our breeding program for high quality of tomatoes, analyses of species, varieties and F1 hybrids in the diallel cross 6 x 6 were made. The results of the analyses made showed that hp/hp and L. cheesmanii typicus had the highest content of lycopin (Table 1). In Table 2 the values of the relationship between the dominant and additive parameter (d/a) are given for every F1 combination. In most cases this relationship was higher than zero and lower than one, showing incomplete dominance of one of the parents. Only in some crosses d/a was equal to one or a little more than one and that showed dominance. The direction of dominance was different.