. 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). Pflra-substitution in regulators with phenyl nuclei with much smaller stimulations than in the case of wheat roots (for PO/B see Aberg, 1952; 3 X lO"" M 4-ClPO/B gives a G value of 11 l-3±l-7;. The G'-curves from the combination experiments {Figure 3) show about a six-fold increase in the antagonistic activity of 4-C1P02B as compared to POzB. As both substances seem to be completely or almost complete
. 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). Pflra-substitution in regulators with phenyl nuclei with much smaller stimulations than in the case of wheat roots (for PO/B see Aberg, 1952; 3 X lO"" M 4-ClPO/B gives a G value of 11 l-3±l-7;. The G'-curves from the combination experiments {Figure 3) show about a six-fold increase in the antagonistic activity of 4-C1P02B as compared to POzB. As both substances seem to be completely or almost completely devoid of intrinsic auxin activity, and assuming in the first instance a negligible influence of the possible difference in their penetration rates (pp. 101-112), this increase may apparently be related to a corresponding increase in their receptor affinity. 4-ClPOfB is known to counteract the effect of externally applied lAA or 2:4-D on the growth ofAvena coleoptile cylinders (McRae and Bonner, 1953); in the concentration range used (about 5> 10~' to 5 <10~^M) the effect 200 180 160 1 ^100 I 80 60 fO 20 "I 1 1 r yPOiB POiB. _L _L "1 r f-ZlTr. 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
