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An aromatic tomato could be looming – a la heirloom varieties, say scientists

Admin by Admin
March 8, 2022
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Working on an international team of scientists, two UF/IFAS researchers helped find a route to several important nitrogen-containing tomato flavor compounds. Credit: UF/IFAS

Genetic modification has made modern tomatoes more disease resistant and shelf-stable. While those traits are important, modern commercial varieties tend to fall short of the flavor potential shown in older varieties. But consumers want tomatoes that taste and smell good.

Indeed, in a study published in 2012, consumers who taste-tested several tomato varieties preferred tomatoes with high levels of nitrogenous volatiles.

For years, consumers have lamented what they deem as the bland taste of tomatoes. Any flavor you savor when you bite into the fruit comes from a combination of many aroma compounds. Some of those compounds contain nitrogen, and they add fruity, floral and tomato vine profiles to the flavor mix. Working on an international team of scientists, two UF/IFAS researchers helped find a route to several important nitrogen-containing tomato flavor compounds.

In a newly published study, scientists showed that five of the compounds are part of a biochemical pathway for synthesis of these important flavor compounds.

Using a closely related fruit, Solanum pennellii, scientists found a site on a chromosome essential to produce detectable nitrogenous volatiles in tomatoes, said Denise Tieman, a UF/IFAS research assistant professor of horticultural sciences. 

That data led scientists to identify a step in the pathway to nitrogen-containing flavor compounds.

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“Now that we know how these compounds are made in tomatoes, we can identify varieties that have the heirloom version of the enzyme and high levels of these flavor compounds, and we can breed this trait into modern tomatoes to improve flavor,” Tieman said.

Tomatoes produce many aroma volatiles, including nitrogen-containing volatiles that are relatively rare in other fruits.

Since these volatiles are active at low concentrations, increasing their levels does not impact yield or fruit size.

Tomatoes are the most valuable fruit produced worldwide. Indeed, in 2020, American farmers harvested about 12,600 tons of fresh market tomatoes and 11 million tons of processing tomatoes from 273,00 acres. That adds up to $1 billion in revenue. Florida harvested 26,000 areas of tomatoes during the 2018-2019 season, valued at almost $426 million.

The new research was published in the Proceedings of the National Academy of Sciences.


Color and flavor – pigments play a role in creating tasty tomatoes


More information:
David K. Liscombe et al, A flavin-dependent monooxygenase produces nitrogenous tomato aroma volatiles using cysteine as a nitrogen source, Proceedings of the National Academy of Sciences (2022). DOI: 10.1073/pnas.2118676119

Denise Tieman et al, The Chemical Interactions Underlying Tomato Flavor Preferences, Current Biology (2012). DOI: 10.1016/j.cub.2012.04.016

Provided by
University of Florida

Citation:
An aromatic tomato could be looming – a la heirloom varieties, say scientists (2022, March 7)
retrieved 7 March 2022
from https://phys.org/news/2022-03-aromatic-tomato-looming-la-heirloom.html

This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
part may be reproduced without the written permission. The content is provided for information purposes only.

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