Fig. 1

Interpopulation and intrapopulation pollen tube growth over time. Pistils of Solanum habrochaites were pollinated with LA0407 pollen and harvested at 12, 24 and 48 h after pollination. a Time course of LA0407 pollen tube growth in styles of LA1777 (solid line, incompatible interpopulation pollination) or in styles of LA0407 (dotted line, compatible intrapopulation pollination) with standard deviation for each time point. b Representative image of LA0407 pollen tube growth in LA1777 pistils at each time point; arrowhead points to the location where the majority of pollen tubes are rejected