Abstract
The influence of indole-3-acetic-acid (IAA) during the development of primary leaves of Sinapis alba was studied. IAA treatment (4 ppm ≈ 22.8 μM) caused a decrease of dry weight, soluble reducing sugars, soluble protein, chlorophylls, carotenoids and cytochrome f; it also caused a lower ratio of protein to chlorophyll, a lower ratio of chlorophyll a to chlorophyll b and a higher ratio of chlorophyll per cytochrome f. Furthermore, IAA treatment induced a significantly lower rate of CO2 fixation and a depressed nitrite reductase activity. Similar effects could also be observed in adaptation reactions brought about by red light and low-light (or shade) conditions.
Zusammenfassung
Der Einfluß von Auxin (IES) auf die Entwicklung der Primärblätter von Senfpflanzen wurde untersucht. Die Behandlung mit IES (4 ppm ≈ 22.8 μM) führte zu einer Erniedrigung des Trockengewichtes, der Gehalte an löslichen, reduzierend wirkenden Zuckern, an löslichem Protein, Chlorophyllen, Karotinoiden und Cytochrom f. Außerdem wurden die Quotienten von Protein zu Chlorophyll und von Chlorophyll a zu Chlorophyll b gesenkt und es kam zu einer Erhöhung des Verhältnisses von Chlorophyll zu Cytochrom f. Darüberhinaus bewirkte die Behandlung mit IES eine deutliche Abnahme der CO2-Fixierungsrate und eine Verringerung der Nitritreduktase-Aktivität. Diese Effekte stimmen gut mit Anpassungsreaktionen überein, die durch Rotlicht oder Schwachlicht hervorgerufen werden.
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Zerbe, R., Wild, A. The effect of indole-3-acetic-acid on the photosynthetic apparatus of Sinapis alba . Photosynth Res 1, 71–81 (1980). https://doi.org/10.1007/BF00018224
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DOI: https://doi.org/10.1007/BF00018224