Prohexadione-Ca—A New Plant Growth Regulator for Apple with Interesting Biochemical Features
| Autor: | D. Treutter, T. Iturriagagoitia-Bueno, J.B. Speakman, R.R. Evans, Wilhelm Rademacher, A. Lux-Endrich, S. Michalek, John R. Evans, S. Roemmelt, P. John |
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| Rok vydání: | 1998 |
| Předmět: | |
| Zdroj: | HortScience. 33:540d-540 |
| ISSN: | 2327-9834 0018-5345 |
| DOI: | 10.21273/hortsci.33.3.540d |
| Popis: | Prohexadione-Ca is currently developed as an inhibitor of excessive vegetative growth in apple. In addition to the control of shoot growth, distinct effects on the incidence of fireblight are observed that are not due to any bactericidal effect of the compound. Further, the compound often causes a delay of senescence. It is known that prohexadione-Ca acts as a structural mimic of 2-oxoglutarate thereby inhibiting dioxygenases, which catalyze distinct steps in gibberellin (GA) biosynthesis. As a result, levels of growth-active GAs are lowered and, hence, longitudinal shoot growth is reduced. Prohexadione-Ca also induces changes in flavonoid metabolism, which may also be related to the inhibition of dioxygenases involved in this pathway. Preliminary evidence is available that this effect is related to a lowered susceptibility of apple tissue towards infection with fireblight. ACC oxidase, another dioxygenase, which catalyzes the conversion of aminocyclopropane-carboxylic acid into ethylene, is also affected by prohexadione-Ca and related compounds. Lowered levels of ethylene may account for a delay of senescence. |
| Databáze: | OpenAIRE |
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