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In vitro development of wild-type and spik-1 pollen. (A) Wild-type (wt) or (B) spik-1 pollen germinated on 0.1 mM K+ medium (bar, 100 μm). (C) Non-developed (see text) spik-1 pollen tubes (bar, 15 μm). (D,E) Histograms showing the length distribution of (D) wild-type (n = 214) and (E) spik-1 (n = 202) germinated grains on the 0.1 mM K+ medium. The two histograms were fitted according to a Gaussian distribution (lines).
