. 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). _L _L "1 r f-ZlTr. WO 300 200 â s. I 100 % w'' w 10~ 10'"^ 10'^ 10''^ Molar concn. 10'^ 10'^ W^ Figure 3. The effects ofphenoxy'isobutyric acid {POiB), iranscimamic acid {Tr). and their A-chloro- derivatives {4-ClPOiB and 4-ClTr, respectively) upon the growth of wheat roots and 2-A-D-inhibited flax roots. The left scale {G) refers to the growth of wheat roots in per cent of control without added regul
. 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). _L _L "1 r f-ZlTr. WO 300 200 â s. I 100 % w'' w 10~ 10'"^ 10'^ 10''^ Molar concn. 10'^ 10'^ W^ Figure 3. The effects ofphenoxy'isobutyric acid {POiB), iranscimamic acid {Tr). and their A-chloro- derivatives {4-ClPOiB and 4-ClTr, respectively) upon the growth of wheat roots and 2-A-D-inhibited flax roots. The left scale {G) refers to the growth of wheat roots in per cent of control without added regulator (continuous lines), the right one [G') to the growth of the 2: -i-D-inhibitedflax roots in per cent of control with 10"' M 2:4-Z) only (broken lines). The growth values are plotted against a logarithmic concentration scale. X is the number of independent experiments represented by the points. upon control sections was negligible. When tested by the present method (p. 94),4-ClPOiB gives a conspicuous inhibition of coleoptile cyhnder growth at 10-^ M and higher concentrations. Up to 5 X 10-^ M, 4-ClPO/B is a stronger inhibitor than FOiB, but at higher concentrations the curves tend to cross each other. This phenomenon will be further studied as it could possibly indicate a very faint residual intrinsic auxin activity of 4-ClPO?B molecules. As in the case of wobutyric acids, there are good reasons to assume that in transc' acids the side chain is of a type normally excluding any 103. 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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Keywords: ., bookcentury1900, bookcollectionbiodiver, booksubjectgrowthplants
