Conversion of Isatin to Isatate as Related to Growth Promotion in Avena Coleoptile and Pisum Stem Sections

Abstract
Isatin, (indole 2,3-dione), which promotes elongation of Pisum stem sections at concentrations exceeding 0.1 m[image]. promotes elongation of Avena coleoptile sections only at higher concentrations, exceeding 1 m[image]. Aged isatin solutions are more active than fresh solutions, due to the slow, spontaneous conversion to isatate (o-amino-phenylglyoxylate). A concentration of 0.1 m[image] aged isatin is as active in Avena coleoptile sections as in peas. Isatate has bee independently synthesized and its auxin activity in both Avena coleoptile and Pisum stem sections confirmed. The synthetic isatate is more effective than isatin in both systems. Auxin activity of isatin may be due to its conversion to isatate.

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