Plant Science Letters
Both compatible and incompatible pollen tubes growing from the ovarian to the stigmatic end of Lilium longiflorum style sections reached lengths not significantly different from similar tubes growing from the stigmatic to the ovarian end. Similarly, there was no significant difference in pollen tube lengths following interspecific pollinations of ovarian versus stigmatic ends of style sections. Neither the self nor the interspecific-incompatibility reactions appear to be due to localized stylar barriers to pollen tube growth in L. longiflorum.
Ascher, Peter D., "Localization of the Self- and the Interspecific Incompatibility Reactions in Style Sections of Lilium Longiflorum" (1977). An. Paper 281.
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