Plant Growth Substances

Roles of Plant Growth Regulating Substances

Practical Applications of Plant Growth-substances in Horticulture

Separation of Plant Growth Regulating Substances on Silica Gel Columns.

The preparation of the silica gel is similar to the method of Bulen, et al (2) for organic acid chromatography. Silicic acid (Mallinckrodt's 100 mesh analytical reagent) is prepared, generally in one pound batches. by repeatedly washing it in distille(d water, and decanting the fine particles that do not settle out of suspension after an arbitrarily chosen period of 15 minutes. After the silici...

Production of plant growth substances by Azotobacter chroococcum.

Cultures of Azotobacter chroococcum strain A6 were grown for 14 days in a nitrogen-deficient mineral medium, the supernatant fluid and bacteria extracted and examined by paper partition chromatography with two solvent systems which separate authentic gibberellin (GA 3) and indolyl-3-acetic acid (IAA). Gibberellin-like substances were not detected on the chromatograms examined under ultraviolet ...

The Chemistry and Mode of Action of Plant Growth Substances

In the last section of the book genetic, hormonal, and enzymatic factors affecting the growth of the nervous system are taken under consideration. Excellent reviews of genetic aspects are given by S. Gluecksohn-Waelsch and L. S. Penrose. G. W. Harris contributes a thoughtful chapter on the relationship between endocrine activity and the development of the nervous system. Although most of the ma...