Abstract
The influence of kinetin during the development of primary leaves of Sinapis alba was investigated. Kinetin treatment (6 ppm) induced an increase of dry weight, of soluble reducing sugars, soluble protein, chlorophylls, carotenoids and cytochrome f; a higher ratio of chlorophyll a to chlorophyll b, higher rates of CO2 fixation per fresh weight and higher activity of nitrite reductase, were also found. These effects are comparable with strong and blue light adaptations. On the other hand, the Hill activity with ferricyanide as the electron acceptor, the rates of CO2 fixation per chlorophyll, the ratios of chlorophyll to cytochrome f and of protein to chlorophyll did not change. Therefore we assume that the kinetin induced and the light induced adaptations are brought about by different causal reaction chains.
Zusammenfassung
Es wurde die Wirkung von Kinetin auf die Entwicklung von Primarblattern von Senfpflanzen untersucht. Die Behandlung mit Kinetin (6 ppm) bewirkte eine Erhöhung des Trochengewichtes, der Gehalte an löslichen, reduzierend wirkenden Zuckern, an löslichem Protein, Chlorophyllen, Karotinoiden und Cytochrom f, sowie eine Erhöhung des Quotienten von Chlorophyll a zu Chlorophyll b, eine verstärkten Einbau von CO2 pro Frischgewicht und eine Erhöhung der Nitritreduktase-Aktivität. Diese Auswirkungen sind den durch Starklicht und Blaulicht hervorgerufenen Anpassungsreaktionen vergleichbar. Andererseits zeigten die Hill-Reaktion (gemessen als Reduktion von Ferricyanid), die CO2 Fixierung pro Chlorophyll, der Quotient von Chlorophyll zu Cytochrom f und der Quotient von Protein zu Chlorophyll keire Veränderungen. Dies weist darauf hin, daß die durch Kinetin und durch Licht hervorgerufenen Anpassungsreaktionen durch verschiedene Kausalketten bedingt werden.
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Zerbe, R., Wild, A. The effect of kinetin on the photosynthetic apparatus of Sinapis alba . Photosynth Res 1, 53–64 (1980). https://doi.org/10.1007/BF00020075
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DOI: https://doi.org/10.1007/BF00020075