Results of investigation of hetero- and homozygous interconnection of tomato keeping quality genes alc, nor, rin are presented. In double heterozygotes alc/alc+//nor/nor+, nor/nor+//rin/rin+, and alc/alc+//rin/rin+ a cumulative polymery resulting in formation of a new "ong-ripening", phenotype was observed. In the case of non-allelic interconnection in double homozygotes alc/alc//rin/rin, nor/nor//rin/rin, and alc/alc//nor/nor considerable inhibition of ripening processes takes place accompanied by suppression of carotenoid synthesis which favours formation of a new "on-ripening" phenotype with green-white colour of a fruit.