Table 1.

Correlation between the tip position and ion fluxes from the light side during the first 10 min of positive bending

Measured ion	a (n)*	r*
H+	151 ± 24 (7)	0·79 ± 0·05
K+	1216 ± 283 (6)	0·74 ± 0·01
Cl–	4225 ± 802 (6)	0·67 ± 0·03
Ca2+	–2480 ± 1466 (10)	–0·05 ± 0·04

For each coleoptile, a linear trend line (ax + b) was fitted for a 10‐min interval starting at the first movement towards light, as shown in Fig. 5. The correlation coefficient r was calculated for the same points using data analysis tools in Microsoft Excel.

* Tabulated coefficients a and r are the mean ± s.e. for the n plants for each ion