The Effect of Self-Compatibility Factors on Interspecific Compatibility in <i>Solanum</i> Section <i>Petota</i>
William L. Behling | David S. Douches
The relationships of interspecific compatibility and incompatibility in <i>Solanum</i> section <i>Petota</i> are complex. Inquiry into these relationships in tomato and its wild relatives has elucidated the pleiotropic and redundant function of <i>S-RNase</i> and <i>HT</i> which tandemly and independently mediate both interspecific and intraspecific pollen rejection. Our findings presented here are consistent with previous work conducted in <i>Solanum</i> section <i>Lycopersicon</i> showing that <i>S-RNase</i> plays a central role in interspecific pollen rejection. Statistical analyses also demonstrated that <i>HT-B</i> alone is not a significant factor in these pollinations; demonstrating the overlap in gene function between <i>HT-A</i> and <i>HT-B</i>, as <i>HT-A</i>, was present and functional in all genotypes used. We were not able to replicate the general absence of prezygotic stylar barriers observable in <i>S. verrucosum</i>, which has been attributed to the lack of <i>S-RNase,</i> indicating that other non-<i>S-RNase</i> factors play a significant role. We also demonstrated that <i>Sli</i> played no significant role in these interspecific pollinations, directly conflicting with previous research. It is possible that <i>S. chacoense</i> as a pollen donor is better able to bypass stylar barriers in 1EBN species such as <i>S. pinnatisectum</i>. Consequently, <i>S. chacoense</i> may be a valuable resource in accessing these 1EBN species regardless of <i>Sli</i> status.
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