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Results of treatment with calcium inhibitors. Unpollinated stigmas were placed on agar plates containing: (A) 1 mm LaCl3, (B) 100 µm verapamil hydrochloride, (C) 10 mm EGTA, (D) 10 µm ruthenium red and (E) 50 µm calcimycin; (F) standard agar plate (control). Pollen tube growth (indicated by red arrows) was detected in (A) and (B). No pollen tube growth was observed in (C), (D) or (E), the same as control (F).
