Plant Physiol.
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Plant Physiol, January 2003, Vol. 131, pp. 129-138

trans-Resveratrol and Grape Disease Resistance. A Dynamical Study by High-Resolution Laser-Based Techniques1

C. Montero, S.M. Cristescu, J.B. Jiménez, J.M. Orea, S. te Lintel Hekkert, F.J.M. Harren, and A. González Ureña*

Unidad de Láseres y Haces Moleculares Instituto Pluridisciplinar, Universidad Complutense de Madrid P° Juan XXIII, 1. 28040 Madrid, Spain (C.M., J.B.J., J.M.O., A.G.U.); and Department of Molecular and Laser Physics University of Nijmegen Toernooiveld, 6525 ED Nijmegen, The Netherlands (S.M.C., S.t.L.H., F.J.M.H.)

Two modern laser-based techniques were synchronously applied to study the dynamics of the trans-resveratrol activity in Botrytis cinerea-infected grapes. Direct analysis of trans-resveratrol in both infected and noninfected grapes (Vitis vinifera, Aledo variety) was performed by using an analytical technique incorporating laser desorption coupled with laser resonant ionization and time-of-flight mass spectrometry. On the other hand, one of the most sensitive on-line methods for trace gas detection, laser photoacoustic spectroscopy, was used to investigate the involvement of the plant hormone ethylene (C2H4) in the B. cinerea grapes interaction and its temporal relationship with the trans-resveratrol content upon infection. The trans-resveratrol content and the ethylene released by noninfected grapes showed an opposite behavior. In this case, a high trans-resveratrol content corresponds to a low ethylene emission. For the B. cinerea-infected grapes, ethylene emission rises up after 48 h when the analogous content of trans-resveratrol started to decrease irreversibly. Moreover, the activity of trans-resveratrol as natural pesticide has been investigated by exogenous application on grapes. A short submerge (5 s) of the grapes in 1.6 × 10-4 M solution of trans-resveratrol delays the increase of C2H4 emission with about 48 h and produces a decrease of the C2H4 concentration and its emission rate. The treatment has positive effects on fruit conservation during storage; it doubled the normal shelf-life of grapes at room temperature, maintaining their post-harvest quality within 10 d.

1 This work was supported by the European Union (contract no. CT98-4211) and by C.R.D.O. Vinalopó (Spain) and The Ministerio de Ciencia y Tecnología of Spain (Grant nos. BQ-2001-1461 and AGL2000-1798-CE). This is experiment station or institution page number ULHM-62-02.

* Corresponding author; e-mail laseres{at}pluri.ucm.es; fax 34-91-394-3265.

© 2003 American Society of Plant Biologists


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