. 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). 120 WO t 80 V 60 0 1 3000 Concentration of auxins (xSxIO V\) Figure 19. Growth curves of oat coleoptile sections {var. Brighton) in buffer'\-sucrose + Tween 80 (0-1 per cent) and various molar concentrations of IA A. IAN. and lAE. Pretreatment of sections and scales are as in Fimre 18. ^ 70- e-0 5-0 lAE h /lAN/ \ i^-O 3-0 2-0 1-0. m 160 110 m 100 80 60 VO Figure 20. Growth curves of oat internode sections in co
. 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). 120 WO t 80 V 60 0 1 3000 Concentration of auxins (xSxIO V\) Figure 19. Growth curves of oat coleoptile sections {var. Brighton) in buffer'\-sucrose + Tween 80 (0-1 per cent) and various molar concentrations of IA A. IAN. and lAE. Pretreatment of sections and scales are as in Fimre 18. ^ 70- e-0 5-0 lAE h /lAN/ \ i^-O 3-0 2-0 1-0. m 160 110 m 100 80 60 VO Figure 20. Growth curves of oat internode sections in conditions similar to those of Figure 19. 0 1 3 10 30 100 300 JOOO 3000 Concentration of auxins (x5xf0'^V\) at equal molar concentrations, the three substances have about the same activity, especially at low concentrations. At higher concentrations, IAN and especially lAE tend to be more active than lAA, but the difference is not a ten-fold one such as can be obtained in the case of IAN with Victory oats under different experimental conditions. The following examples show how this more sensitive first internode test 24. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wye College; Wain, R. L; Wightman, F. (Frank). London, Butterworths Scientific Publications
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