Fig. 1.

Pollen germination and pollen tube elongation are inhibited by ATPγS but not AMPS. (A) In vitro germination of Arabidopsis WS pollen treated with various concentrations of ATPγS or AMPS. (B) In vitro germination of Medicago truncatula pollen with various concentrations of ATPγS or AMPS. (C) Arabidopsis WS pollen was germinated in vitro, and, after pollen tubes were visible (1–2 h), various concentrations of ATPγS or AMPS were added and the growth rate of the pollen tubes was measured. Different letters above the bars indicate values that are significantly different from each other (P ≤0.05). Error bars are ±SE.