Plant Physiol. Drug Metab Dispos
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Plant Physiology 92:1148-1153 (1990)
© 1990 American Society of Plant Biologists

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Development and Growth Regulation

Flavonoid Accumulation Is Correlated with Adventitious Roots Formation in Eucalyptus gunnii Hook Micropropagated through Axillary Bud Stimulation 1

Paolo Curir, Christian F. VanSumere, Agostino Termini, Philippe Barthe2, Augusto Marchesini3 and Marcello Dolci4

Istituto Sperimentale per la Floricoltura, Corso Inglesi 508, 18038, Sanremo, Italy, Laboratory for Plant Biochemistry, University of Gent, Ledganckstraat 35, B-9000 Gent, Belgium

Eucalyptus gunnii Hook microcuttings, obtained in vitro through axillary bud stimulation, show different rooting responses on the same rooting medium depending on the physiological state induced by cytokinins used in the previous multiplication medium. 6-Furfurylamino purine and 6-(4-hydroxy-3-methylbut-2-enylamino)purine induced a physiological state characterized by high sensitivity of microcuttings to the rooting stimulus exerted by the auxin 3-indolebutyric acid, but N6-benzyladenine did not produce the same effect. The former physiological state was characterized by an increased accumulation of two endogenous flavonoids (identified as quercetin glycosides) which may be markers of a well defined physiological state. They could have some direct influence on the rooting processes of the explants cultivated in vitro.

2 Present address: Laboratoire de Physiologie Végétale, Université de Nice, 28 Avenue Valrosa, F-06034 Nice, France.

3 Present address: Istituto Sperimentale per la Nutrizione delle Piante, Via Ormea 47, 10125 Torino, Italy.

4 Present address: Istituto di Chimica Agraria dell `Università, Via Pietro Giuria 15, 10126 Torino, Italy.

1 Supported by the Agriculture and Forests Italian Ministry. Finalized Project Floriculture: Cut Green and Pot Plants.






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Copyright © 1990 by the American Society of Plant Biologists