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It is possible to obtain pollen germination and pollen tube growth in vitro if boric acid is present. In this work the effect was studied using as a semiquantitative parameter the mean length (l̄) of Lilium longiflorum pollen tubes. Pollen tube growth was examinated in dependence on boric acid, ortho-silicic acid, nucleic bases, Ca 2+  and Zn 2+  in 10% sucrose solution. The maximum of l̄ is obtained for concentrations between 2-20 ppm boron. The simultaneous supply of silicon added as water glass leads to a synergistic stimulation effect on pollen tube growth and facilitates branching. The silicon action is preceded of a pollen tube growth inhibition period during 3 h. Adenine and guanosine are able to substitute partially boron as pollen germination and pollen tube growth stimulator. Concentrations of 100 ppm adenine leads to half the boron effect. The same stimulation effect is obtained by guanosine. Ca 2+  can partially substitute boron as well. The stimulation action of boron is significantly attenuated by Zn 2+  and by the herbicide Dicuran. These and preceding results from physiological studies indicate that boron and silicon should be essential trace elements for the regulation of molecular biological processes.

The Role of Boron, Silicon and Nucleic Bases on Pollen Tube Growth of Lilium longiflorum (L.)