Abstract
Diurnal variations in endogenous IAA levels inFatsia japonica leaves, maintaining constant other external factors such as temperature and relative humidity, were studied. Plants were cultivated in a growth chamber (20 °C, 75 % RH, 16 h photoperiod, 400 µmol m-2 s-1 PAR). IAA analyses were carried out by analytical IP-HPLC with on-line spectrofluorimetry. Rhythmic variation of endogenous IAA levels was found. At the onset of the light period the IAA concentration dropped very rapidly from 1070 pmol g-1 (fr.m.) to 144 pmol g-1 (fr.m.). This concentration was nearly constant throughout the entire light period. During the subsequent dark period the IAA levels increased again to about 1000 pmol g-1 (fr.m.) at the end of the dark phase. These results were not confirmed in open field conditions where many other external factors probably influence the endogenous IAA content.
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Lopez-Carbonell, M., Alegre, L., Prinsen, E. et al. Diurnal fluctuations of endogenous IAA content in aralia leaves. Biol Plant 34, 223–227 (1992). https://doi.org/10.1007/BF02925873
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DOI: https://doi.org/10.1007/BF02925873