Bananas are one of the world's most popular fruits. But how they're stored prior to reaching grocery shelves can adversely affect their flavour and smell. Now in a study appearing in ACS' Journal of Agricultural and Food Chemistry, scientists report that cold temperatures suppress the activity of proteins that play a key role in the formation of the banana's distinct aromas. They say this discovery could lead to enhancements of the fruit's fragrance and flavour.
Billions of bananas are eaten worldwide every year. A typical American eats about 11 pounds of this fruit annually, according to the USDA. Most bananas are grown overseas, which means to reach U.S. shores intact, they must be shipped in
refrigerated containers. Although chilling delays ripening, it also can damage the fruit and subdue its aroma. Previously, researchers found that proteins called transcription factors (TFs), which help regulate the activity of certain genes, are involved in fruit ripening. Building on this work, Jian-fei Kuang and colleagues wanted to find out if a particular set of TFs play a role in the dampening of aromas in chilled or refrigerated bananas.
In a series of experiments, the research team found that refrigeration decreased the activity of aroma-forming genes during ripening. Digging deeper, they detected a pair of TFs called MabZIP4 and MabZIP5 that appear to play an important role in activating these genes. According to eurekalert.org, the researchers conclude that a better understanding of this regulatory process could lead to strategies to make bananas smell even better.
