TESTING THE SI x SC RULE: POLLEN-PISTIL INTERACTIONS IN INTERSPECIFIC CROSSES BETWEEN MEMBERS OF THE TOMATO CLADE (SOLANUM SECTION LYCOPERSICON, SOLANACEAE)

摘要

Premise of the study: Interspecific reproductive barriers (IRBs) act to ensure species integrity by preventing hybridization. Previous studies on interspecific crosses in the tomato clade have focused on the success of fruit and seed set. The SI x SC rule (SI species x SC species crosses are incompatible, but the reciprocal crosses are compatible) often applies to interspecific crosses. Because SI systems in the Solanaceae affect pollen tube growth, we focused on this process in a comprehensive study of interspecific crosses in the tomato clade to test whether the SI x SC rule was always followed.