Kinetics of upward bending response of gravistimulated snapdragon shoots.
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Angular position transducer

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To get more accurate information about the initial bending, shoots were hooked up to an angular position transducer. The upward bending of the shoot was plottet on a strip chart recorder after which the actual angle could be calculated with equation 2 (see box 1). In the graph below (fig. 9), the gravitropic responses of different shoots are depicted during initial gravitropism. With the use of linear regression, bending rates were calculated of all four shoots (tab. 6).

Figure 9. The gravitropic response of 4 commercial snapdragon
shoots recorded with an angular position transducer.
There values were calculated by means of 'equation 2' (see box 1).

shoot	bending rate [^o.h^-1]
1	4.6
2	8.1
3	8.2
4	12.0

Table 6: Bending rates [^o.h^-1] of four commercial shoots
during the linear part of the gravitropic response.
Figure 6 was used to calculate these rates.