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THE PLANT CELL, Vol 9, Issue 11 1999-2010, Copyright © 1997 by American Society of Plant Biologists
Pollen Tube Growth and the Intracellular Cytosolic Calcium Gradient Oscillate in Phase while Extracellular Calcium Influx Is Delayed
T. L. Holdaway-Clarke, J. A. Feijo, G. R. Hackett, J. G. Kunkel and P. K. Hepler
Biology Department, Morrill Science Center, University of Massachusetts, Amherst, Massachusetts 01003
Ratio images of cytosolic Ca2+ (Ca2+i) in growing, fura-2-dextran-loaded
Lilium longiflorum pollen tubes taken at 3- to 5-sec intervals showed that
the tip-focused [Ca2+]i gradient oscillates with the same period as growth.
Similarly, measurement of the extracellular inward current, using a
noninvasive ion-selective vibrating probe, indicated that the tip-directed
extracellular Ca2+ (Ca2+o) current also oscillates with the same period as
growth. Cross-correlation analysis revealed that whereas the [Ca2+]i
gradient oscillates in phase with growth, the influx of Ca2+o lags by ~11
sec. Ion influx thus appears to follow growth, with the effect that the
rate of growth at a given point determines the magnitude of the ion influx
~11 sec later. To explain the phase delay in the extracellular inward
current, there must be a storage of Ca2+ for which we consider two
possibilities: either the inward current represents the refilling of
intracellular stores (capacitative calcium entry), or it represents the
binding of the ion within the cell wall domain.
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