Tomatoes are good for you. They strengthen the immune system and can prevent heart and circulatory disease. Now, researchers from the Max Planck Institute of Molecular Plant Physiology, in co-operation with Israeli scientists, have identified DNA fragments in tomatoes that make their contents both healthy and tasty. The researchers crossed wild tomatoes with cultured ones, then investigated the contents and genetic make-up of the hybrid. The results could allow tomato growers to use wild tomatoes to produce cultured tomatoes with the characteristics they desire (Nature Biotechnology, March 12, 2006).

Tomatoes are a major nutrient for humans. In 2004, 120,000 tonnes of tomatoes were harvested worldwide - and every year this number increases. Numerous medical studies have shown the health value of tomatoes. Lycopen, the pigment that makes tomatoes red, can for example prevent heart disease. Tomatoes furthermore contain a lot of vitamins C and E, indispensable for human nourishment. But after centuries of cultivation for shape, colour, and other useful qualities, our cultured tomatoes today are of small genetic diversity, in comparison with wild types. This has affected the taste and health value of the fruits.

To cultivate tomato strains with particular characteristics, researchers have to increase the genetic diversity of cultured tomatoes. This can be done either by cross-breeding them with wild tomatoes, or changing their genetic make-up technologically. Scientists from the Max Planck Institute for Molecular Plant Physiology in Golm, and their Israeli colleagues at Hebrew University in Jerusalem, chose the second option. They investigated strains of tomatoes created from the crossing of cultured and wild types. Their goal was to identify the biochemical composition of fruits and determine which factors control their development. The German-Israeli research team used a method of analysis developed at the Max Planck Institute for Molecular Plant Physi
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Contact: Dr. Alisdair R. Fernie
fernie@mpimp-golm.mpg.de
49-331-567-8211
Max-Planck-Gesellschaft
24-Mar-2006

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