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ISHS Acta Horticulturae 239: VI International Symposium on Growth Regulators in Fruit Production

NEW PLANT GROWTH RETARDANTS: BIOCHEMICAL BACKGROUND AND POSSIBILITIES FOR PRACTICAL APPLICATION

Author:   W. Rademacher
Abstract:
Compounds such as tetcyclacis (a norbornanodiazetine), paclobutrazol, uniconazole, triapenthenol and BAS 111 .. W (triazoles), flurprimidol (a pyrimidine), and inabenfide (a 4-pyridine) have been found during recent years to be plant growth retardants with promising properties. Growth retardation is primarily induced by inhibition of gibberellin biosynthesis between ent-kaurene and ent-kaurenoic acid. In addition to this, evidence is available that the new compounds interfere with the oxidative metabolism of abscisic acid and phytosterols as well as with the formation of cytokinins and ethylene. These interactions may, however, vary from one compound to another. The main practical effect for all these new retardants is the reduction of shoot growth, which can be of benefit in many plant species. In addition to this, a reduced degree of susceptibility towards climatic and pathogen stress is frequently observed under the influence of the new compounds.
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