THE work of Went and co-workers and that of Zimmerman and his associates has amply demonstrated the value of the so-called ‘root-forming’ hormones. Went, Bonner and Warner1 have shown that in certain cases vitamin B1 treatment of hormone-treated cuttings has resulted in a great increase in the rapidity of rooting and in the number of roots produced. I have confirmed this finding in the case of one species, namely, Camellia, used by these workers, but it is apparent that the treatment with vitamin B1 (aneurin) must be given at the appropriate time after hormone treatment. This period after hormone treatment is difficult to determine. In some instances response has been rapid and at other times no response to vitamin B1 has been obtained, but the same cuttings may respond to later treatment.
Went, F. W., Bonner James and Warner, G. C., Science, 87, No. 2251 (1933).
White, P. R., Plant Physiology, 12 (1937).
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Physiologia Plantarum (1950)