Fig. 5From: The strong competitive role of 2n pollen in several polyploidy hybridizations in Rosa hybridaGermination of 1n and 2n pollen on pistil of ‘Orange Fire’. a ‘Old Blush’ pollen germinated on the surface of ‘Orange Fire’ stigma. b Pollen tubes in the transmitting tissue at the junction of stigma and style where shows the strongest intensity of pollen competition. The part of the pollen tube is twisted at the apical region and stops growing while normal pollen tubes grow through the stigma into the style. c Pollen tubes in the style at 48 h after pollination. d. Pollen tubes enter ovary at 72 h after pollination. pt.: pollen tube, cp: callose plug. A bar =25 μm, B~D bar = 40 μmBack to article page