“…Fahnrich and Ultlich (1964) reported that the germination and growth of the pollen tube of Petunia hybrida and Antirrhinum majus were not stimulated by 0.1 mM Al with 1.0 mM B at pH 5.2. However, such a pollen tube growth may be stimulated by Al under the conditions of our experiments with low Al concentrations, low medium pH, coexistence of cations, and absence of B.…”