Elisabeth S. Pierson, Deborah D. Miller, Dale A. Callaham, Alan M. Shipley, Bruce A. Rivers, Mauro Cresti, Peter K. Hepler, Pollen Tube Growth Is Coupled to the Extracellular Calcium Ion Flux and the Intracellular Calcium Gradient: Effect of BAPTA-Type Buffers and Hypertonic Media, The Plant Cell, Vol. 6, No. 12 (Dec., 1994), pp. 1815-1828
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Pierson et al. (1994) studied this question.