Spanish Ministry of Science and Technology

The author would like to acknowledge the financial support for this research line provided by the Spanish Ministry of Science and Technology (SEC2004). 

Finally, we also wish to thank the following institutions for their generous and indispensable support The European Commission, the Spanish Ministry of Science and Technology, Iberia, the local governments (cabildos) of the islands of Tenerife and La Palma, and the Puerto de la Cruz Town Council. 

Financial support for this work was provided by the Spanish Ministry of Science and Technology under project MAT2000-1334. The authors thank Gustavo V. Guinea for useful comments and Jose Miguel Martinez and Rosa Marfa Morera for their help with the illustrations and in typing the manuscript. 

Lo Gorton and Elena Dominguez thank The Swedish Natural Science Research Council (NFR) and The Spanish Ministry of Science and Technology, respectively. 

The authors tpredate the financial assistance received from the Spanish Ministry of Science and Technology throu its projects PPQ2001-0692-C02-02 and CTQ2004-08232-C02-02. 

This work was carried out with the financial support of the University of the Basque Country (Project UPV 069.310-13607/2001) and of the Ministry of Science and Technology of the Spanish Government (Project PPQ2001-0780). 

We are grateful to Dr. Marina Horjales, Dr. Nieves Redondo, and Alfonso Blanco (Faculty of Sciences, University of Vigo) for their help in the optimization of cell cycle analysis and mitotic index technique applied to lettuce. The authors also want to thank Claudia Carcamo and Oliver Weiss for their continual and valuable help in these experiments. Financial support from Ministry of Science and Technology (Spanish Government) is also acknowledged. 

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