Figure 8.

Precocious germination of gpr1 pollen grains. (A) Representative images taken at the indicated time point. Black arrows indicate pollen grains with tube protrusion; black arrowheads indicate pollen grains with tubes equal to or longer than their diameter. (B) Pollen germination rate. The data were presented as the means ± SD (n = 519–2108; * p < 0.05, ** p < 0.01, *** p < 0.001 by Student’s t test). (C,D) Images of opening flowers of wild type (C) and gpr1-1 (D) taken in the afternoon. White arrows indicate pollen tubes. Note precocious pollen germination inside the gpr1-1 anther.