Growth substances

M. Bopp, ed.. Plant Growth Substances, Springer-Vedag, Berlin, 1986. 

Davies, W.J., Metcalfe, J., Lodge, T.A. Rosa da Costa, A. (1986). Plant growth substances and the regulation of growth under drought. Australian Journal of Plant Physiology, 13, 105-25. 

Hartung, W., Gimmler, H. Heilmann, B. (1982). The compartmentation of abscisic acid, of ABA - biosynthesis, ABA - metabolism and ABA conjugation. In Plant Growth Substances 1982, ed. P.F. Wareing, pp. 325-334. London Academic Press. 

Isolation of plant growth substances. Edited by J.R. Hillman... 

T. Sibaoka, in Plant Growth Substances (F. Skoog, ed.), Springer-Verlag, Berlin, 1980, pp. 462-469. 

Audus, L.J. Plant Growth Substances. "Chemistry and Physiology," Leonard Hill London, Vol. 1, pg. 240. 

Mandava, N.B. "Natural Products in Plant Growth Regulation" in "Plant Growth Substances," Mandava, N.B., Ed., ACS Symposium Series, Vol. Ill, Anerican Chemical Society, Washington, DC., 1979, p. 135. 

In view of the great agricultural importance today of the synthetic plant growth substances in controlling the growth of plants of economic importance, details of the history of this development of investigations on plant hormones are presented. 

The facts indicate that the plant growth substances must effect their inhibitions by forming loose combinations, or easily dissociated compounds, with enzymes or metabolites in the plant cell. 

Audus and Quastel (4) have found that the presence of p-aminobenzoic acid exerts an antagonism, though a relatively feeble one, to the root growth inhibitory actions of 2,4-dichlorophenoxyacetic acid, 2-chloro-4-methylphenoxyacetic acid, 2-naphthoxyacetic acid, and 2-indoleacetic acid. For any marked degree of antagonism the concentration ratio of p-aminobenzoic acid to the growth substance must be of the order of 10,000. This relatively feeble action is ii marked contrast to the effect of p-aminobenzoic acid on the... 

F. G. Hopkins wrote me a pleasant note, as he presumably did to you. I have not yet seen the reprint which he states he has sent, but I shall reply that we do not regard ourselves as the sole scientists entitled to feed rats. Evidently he is impressed with the idea of a "growth substance" or something of that sort, aside from the ordinary nutrients. (2k)... 

All of us are dealing with problems which involve extremely complicated conditions, and we must be prepared to be confronted with unexpected results for some time to come. For example, our experience in studying the effect of small additions of milk to various artificial diets has rarely been that which we expected from your report.We have no intention of intruding on your field in making these experiments, nor do we expect to publish our results as evidence that your experiments involve error, or that your published conclusions are incorrect.. ..We are convinced that the pursuit of the growth substance involves some of the most important problems of biochemistry, and that it will not be long before the combined efforts of those who engage in it will solve at least some of them. (31)... 

It should also be said again that casein, the complete protein (in terms of its amino acid content), was obtained from milk. Whether highly purified by the Merck Co. or not (as in "protene"), we have noted Hopkins i ns i stence that only hot alcohol could extract the growth substances completely. Casein, Hopkins believed, could also adsorb trace amounts of these substances. McCollum, Drummond and Osborne and Mendel would all demonstrate that lactose, also obtained from cow s milk, adsorbed variable quantities of growth promoting materials. (Anyone who has left a... 

Radish Ozone W>6 Benzyladenine (30-ppm spray) Growth substance 100 7... 

The discovery of ethylene as a plant growth substance followed from the observation in Germany that leakage of gas used in street lighting was associated with the defoliation of trees. Subsequent research demonstrated the active component as ethylene, which was then implicated in the endogenous acceleration of ripening, the promotion of flowering and sex determination in addition to abscission of plant parts. 

R. J. Weaver, Plant Growth Substances in Agriculture, W. H. Freeman, San Francisco, 1972. 

R. J. Weaver and R. M. Sachs, inF. Wightman andC. Setterfield (Eds.), Biochemistry and Physiology of Plant Growth Substances, Runge, Ottawa, 1968, pp. 957-974. 

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