Table I.

[Ca²⁺]_cyt oscillation and the growth rate of the growing pollen tube

Experiment	Oscillation Period	[Ca2+]cyt			Mean Growth Rate	No. of Experiment
		Max.	Min.	Mean
	sec	μma			μm/minb
In vitroc	12 ∼ 21	0.68	0.15	0.39	0.7 ± 0.2	16
In vivo	∼ 6	1.14	0.64	0.86	13.2 ± 0.3	20
Semi in vivo	9 ∼15	2.18	0.91	1.42	2.3 ± 0.2	20

^a[Ca²⁺]_cyt at the tip region (5 × 5 μm²) was calculated. Mean values indicate average over time in the individual pollen tubes in all experiments. Max and min values indicate peak and tough values.

^bAll values reported as mean ± sd.

^cThe growing pollen tube just after germination was monitored.