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Journal of Experimental Botany, Vol. 51, No. 348, pp. 1267-1275, July 2000
© 2000 Oxford University Press

Original papers

Early physiological and cytological events induced by wounding in potato tuber

Anna Adele Fabbri1,5, Corrado Fanelli1, Massimo Reverberi1, Alessandra Ricelli1, Emanuela Camera2, Sandra Urbanelli3, Annalisa Rossini4, Mauro Picardo2 and Maria Maddalena Altamura4

1 Dipartimento Biologia Vegetale, Università ‘La Sapienza’, Largo Cristina di Svezia 24, 00165 Rome, Italy
2 Istituto Dermatologico San Gallicano, IRCCS, via San Gallicano 25, 00153 Rome, Italy
3 Dipartimento di Genetica e Biologia Molecolare, Università ‘La Sapienza’, via Lancisi 29, 00191 Rome, Italy
4 Dipartimento Biologia Vegetale, Università ‘La Sapienza’, P.le Aldo Moro 5, 00185 Rome, Italy

The response of potato tuber (Solanum tuberosum L. cv. Kennebec) to mechanical wounding was investigated at different times. Changes in the levels of indole-3-acetic acid (IAA), polyunsaturated fatty acids (PUFAs) and lipid hydroperoxides (LOOHs) were monitored up to 120 min after wounding and related to the cytological events occurring up to 24 h. Twenty minutes after injury, an increase in IAA and LOOH levels and a decrease in the levels of PUFAs was observed. Wounding induced mitoses in differentiated (parenchyma) cells starting at 120 min, and promoted an increase of mitotic activity in the meristematic cells (procambium and bud dome), after 360 min. The inhibition of the increase in LOOHs and IAA by lipoxygenase (LOX) inhibitors, as well as the ability of in vitro peroxidated linoleic acid to enhance IAA production, suggest a close relationship among lipoperoxidation, IAA and mitotic activity in the response of potato tuber cells to injury, resulting in a specific growth response, i.e. bud growth and periderm formation.

Key words: Indole-3-acetic acid, lipids, lipid hydroperoxides, mitosis, wounding.


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