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Crossing scheme used to develop S. lycopersicum × S. lycopersicoides interspecific hybrids and bridging lines containing gametophytic unilateral incompatibility factors from S. pennellii. L, genome of S. lycopersicum; S, genome of S. lycopersicoides. Pollen of S. lycopersicum is rejected on pistils of S. lycopersicoides and its interspecific hybrids with cultivated tomato, whereas “bridging lines” containing specific gametophytic factors from S. pennellii are compatible.
