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Histogram of pollen tube lengths following pollinations of allotriploid S. lycopersicum × S. lycopersicoides hybrids (♀) with bridging lines segregating for two pollen compatibility factors from S. pennellii. Pollen tube lengths are measured from the position where the majority of tubes are arrested, excluding outlier tubes that may grow a little further (see Figure 3). Measurements were taken 24 hr after pollination.
