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Faster pollen tube growth in iamt1 ovaries. Progress of pollen tubes was visualized with callose (a, b) and GA20ox1::GUS (c, d) staining of wild‐type and iamt1 ovaries 6 h after manual application of wild‐type pollen. (e) Pollen tube growth rate determined after pollination of wild‐type and iamt1 mutant ovaries with wild‐type pollen. Arrowheads in (a) and (b) mark the point reached by pollen tubes. Scale bars in (a) and (c) are 0.4 and 0.2 mm, respectively.
