. The chemistry and mode of action of plant growth substances; proceedings of a symposium held at Wye College, University of London, July 1955. Plant regulators; Auxin; Growth (Plants). Natural auxins It is now of interest to compare the course of the rotation curves from the beginning of rotation and onwards, after they leave the curve for con- tinuous exposure, and this has been done in Figure 7. In the case of exposures for 16 and 32 minutes, the curvature present at the end of the exposure was subtracted from all the later values. The abscissa is the time {T) after E-16 to 32 min. = 0
. The chemistry and mode of action of plant growth substances; proceedings of a symposium held at Wye College, University of London, July 1955. Plant regulators; Auxin; Growth (Plants). Natural auxins It is now of interest to compare the course of the rotation curves from the beginning of rotation and onwards, after they leave the curve for con- tinuous exposure, and this has been done in Figure 7. In the case of exposures for 16 and 32 minutes, the curvature present at the end of the exposure was subtracted from all the later values. The abscissa is the time {T) after E-16 to 32 min. = 0-SSvn\n £=0-5m'\r\ £L. Figure 7. Development of geotropic curvatures during rotation at i?/0-5 on the klinostat. Ordinate: increase in curvature {C^+ t~'^e) during the period of rotation. Abscissa: time {T) after beginning of rotation. Duration of preceding horizontal exposure (E) indicated for each curve. Data from Figure 6. 20 eo Time ââ¢â 100 no min beginning of rotation. When it comes to exposures of 4 and 0-5 minutes, the graphic transposition requires an assumption as to the course of the lower part of the reaction curve for non-rotated roots. If this curve were to Figure 8. Attempt at an estimation of the presentation time. Ordinate: increase in curvature during the rotation (C^+yâC^), readon curves inFigure? at times [T) indicated for each curve. Abscissa: logarithm of the duration of horizontal exposure {E). The log- arithm of the presentation time {the shortest exposure which will produce a response later) estimated by extra- polation to â0-5, corresponding to a presentation time of 0-3 minutes. be extrapolated back as a straight line, a fictitious negative an'gle would be present at the beginning of rotation, and a corresponding angle should be added as a correction. In making this set of curves, however, it was assumed that a positive angle of about 1° was present after 4 minutes of exposure and that practically no curvature was present after 0-5 minu
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