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Effects of peptide on pollen tube growth at different pH environments. Tomato pollen was germinated for 1 h in PGM-MES medium buffered to pH 5.5, 6, 6.5, or 7 containing either no peptide (white bars) or 0.05 μm SlPRALF (gray bars). Average number of normal pollen grains with tubes greater than the radius of the grain is shown as the percentage of normal pollen tubes ± se. n ≥ 100 for each pH.
