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How sweet it is: Tomato researchers discover link between ripening, color and taste
Date:6/28/2012

For many grocery shoppers, those perfect, red tomatoes from the store just can't match the flavor from the home garden. Now, researchers at Boyce Thompson Institute for Plant Research at Cornell University, USDA and the University of California at Davis have decoded a gene that contributes to the level of sugar, carbohydrates and carotenoids in tomatoes. (Science, June 29, 2012)

Cuong Nguyen, a Cornell graduate student in plant breeding working at the Boyce Thompson Institute (BTI), along with colleagues at BTI, USDA, UC Davis, Universidad Politecnica de Valencia (Spain), Universidad de Mlaga (Spain) and University of Suleyman Demiral (Turkey) revealed the gene that underlies the uniform ripening mutation.

This gene also influences how tomato fruits ripen and is used by commercial breeders to create tomatoes that develop into perfectly red, store-ready fruit. "Practically, it is a very important trait," says James Giovannoni, a plant molecular biologist with BTI and the U.S. Department of Agriculture, Agricultural Research Service, who is a senior author on the paper. "It's a gene that whether you realize it or not, most of your tomatoes have." However, this same trait reduces sugars and nutrients in the fruit.

Naturally, tomatoes have uneven ripening, showing darker green patches when unripe and variable redness when ripe traits that still show up in garden-variety and heirloom breeds. However, in the late 1920s, commercial breeders stumbled across a natural mutation that caused tomatoes to ripen uniformlyfrom an even shade of light green to an even shade of red. This mutation, known by plant biologists as 'uniform ripening', has become indispensable to the $2 billion a year US commercial tomato market, showing up in almost all tomatoes produced for grocery stores. The uniform redness makes it ideal for the grocery sector, which has to appeal to customer expectations of evenly colored, red fruit.

Nguyen conducted
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Contact: Blaine Friedlander
bpf2@cornell.edu
607-254-8093
Cornell University
Source:Eurekalert

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