Scientists discover why supermarket tomatoes taste so bland
A new genetic analysis reveals big differences between cultivated and wild tomatoes and domesticated, store-bought tomatoes.
- Scientists compared the genomes of 725 wild and cultivated tomatoes (a pan-genome) to the tomato genome that's used to represent all varieties.
- The representative genome was missing thousands of genes present in the pan-genome, including one that's responsible for imparting flavor to the vegetable.
- The good news is that breeders seem to have recently began selecting for flavor, so it's possible that store-bought tomatoes could soon start tasting better.
Ever wonder why those pale-orange tomatoes in the supermarket often taste so bland? A new study shows that 93 percent of modern, domesticated tomatoes are missing a version of a gene that gives tomatoes their signature flavor.
The culprit isn't genetic modification, but rather breeders who've long selected for desirable traits that yield the most economic return. Over time, flavor-enhancing genes have been lost or negatively selected during the breeding process. The result is that today's supermarket tomatoes lack genetic diversity, and therefore flavor.
"During the domestication and improvement of the tomato, people mostly focused on traits that would increase production, like fruit size and shelf-life," Zhangjun Fei, a plant geneticist at Cornell University in Ithaca, New York, who led the new study, said in a statement. "Some genes involved in other important fruit quality traits and stress tolerance were lost during this process."
The researchers, who published their findings in the journal Nature Genetics, conducted the analysis by compiling the genetic information of 725 cultivated and wild tomatoes into a pan-genome, which represents the genetic information of all the strains. (The inclusion of wild tomatoes is especially important because they're more genetically diverse.) Then they compared this information to the domesticated tomato genome Heinz 1706, which is often used as a representative example of tomato genomes, according to Discover.
The comparison revealed that Heinz 1706 was missing some 5,000 genes that were found in the pan-genome. Importantly, the researchers found that most tomatoes you'd find in the supermarket lack a rare form of a gene that gives tomatoes flavor. However, this gene – TomLoxC – is found in 90 percent of wild varieties.
"TomLoxC appears, based on its sequence, to be involved in producing compounds from fats," James Giovannoni, a USDA scientist and co-author on the paper, said in a statement. "We found it also produces flavor compounds from carotenoids, which are the pigments that make a tomato red. So it had an additional function beyond what we expected, and an outcome that is interesting to people who enjoy eating flavorful tomatoes."
The researchers hope their analysis will provide a more comprehensive resource for the "mining of natural variation for future functional studies and molecular breeding." In the meantime, it's possible that tomato breeders will start to return flavor to the vegetables on their own. Giovanni explained that TomLoxC is becoming more prevalent in modern, domesticated tomatoes, even compared to just a few years ago. The likely answer is that some breeders have begun to select for flavor.
Boosting the flavor of tomatoes could make a big difference in how we enjoy our meals, considering that tomatoes play a big role in most diets. For example, in the U.S., Americans eat an average of 20.3 pounds of tomatoes and 73.3 pounds of processed tomatoes each year.
- Big, Red and Tasteless: Why Tomatoes Lost Their Flavor ›
- Scientists Find Genetic Reason Why Store-Bought Tomatoes Taste ... ›
- A chemical genetic roadmap to improved tomato flavor | Science ›
- Tomato pan-genome makes bringing flavor back easier: Nearly ... ›
What can 3D printing do for medicine? The "sky is the limit," says Northwell Health researcher Dr. Todd Goldstein.
- Medical professionals are currently using 3D printers to create prosthetics and patient-specific organ models that doctors can use to prepare for surgery.
- Eventually, scientists hope to print patient-specific organs that can be transplanted safely into the human body.
- Northwell Health, New York State's largest health care provider, is pioneering 3D printing in medicine in three key ways.
Beyond Beef sizzles and marbleizes just like real beef, Beyond Meat says.
- Shares of Beyond Meat opened at around $200 on Tuesday morning, falling to nearly $170 by the afternoon.
- Wall Street analysts remain wary of the stock, which has been on a massive hot streak since its IPO in May.
- Beyond Meat faces competition from Impossible Foods and, as of this week, Tyson.
The most valuable college majors will prepare students for a world right out a science fiction novel.
- The future of work is going to require a range of skills learned that take into account cutting edge advancements in technology and science.
- The most valuable college majors in the future will prepare students for new economies and areas of commerce.
- Mathematics, engineering and science related educational majors will become an ubiqitous feature of the new job market.
A recent study used data from the Big Five personality to estimate psychopathy prevalence in the 48 contiguous states and Washington, D.C.
- The study estimated psychopathy prevalence by looking at the prevalence of certain traits in the Big Five model of personality.
- The District of Columbia had the highest prevalence of psychopathy, compared to other areas.
- The authors cautioned that their measurements were indirect, and that psychopathy in general is difficult to define precisely.
SMARTER FASTER trademarks owned by The Big Think, Inc. All rights reserved.