Fig. 6

Progression of the pollen tube of ‘Old Blush’ growing in the pistil of ‘Orange Fire’ and ‘DEE’. a Progression in the time and position of ‘Old Blush’ pollen growing in the pistils. b The pollen germination rate varied with the hours after pollination. c The growth rate proportion of the 2n pollen tube per hour after pollination. d The rate of growth in length of the pollen tube per hour after pollination. e Pollen tube growth rate per hour after pollination. f The thickness of the callose plug at different positions in the pistil after the pollen tube entered the ovary (72 h). g The density of the callose plug at different positions in the pistil after the pollen tube entered the ovary (72 h)