Art museums are full of centuries-old paintings with details of plants that today give us clues about evolution and breeding.
Exhibited at the Metropolitan Museum of Art in New York City, The Harvesters created in 1565 shows farmers cutting wheat nearly as tall as they are. "Nowadays, if you walk through a wheat field, you basically see that wheat is about knee height. The short wheat is essentially a consequence of breeding from the second half of the 20th century," said biologist Ive De Smet.
According to De Smet, wheat is just one example of how historical artworks can allow us to track the transformation of crops over time. He has teamed up with art historian David Vergauwen to seek similar kinds of artworks around the world.
As friends since childhood, their interest in plants in artworks began with a visit to a museum in Russia, where they noticed an old-looking watermelon in an early-7th-century painting. A watermelon is usually believed to be red on the inside. However, that one appeared to be pale and white. De Smet assured the painter had done a poor job. But Verguawen had a different idea. "This is one of the best painters ever in that era. So, if he painted it like that, that's the way it must have looked like."
Other paintings revealed that there were both red and white watermelons grown in the 17th century. The chemical compound that makes watermelons red is lycopene (番茄红素). "There must have been some sort of mutation (突变) preventing the accumulation of that color. Now, with all the genetic knowledge that we have of various plant species, we can look in more detail at how something comes about."
De Smet and Verguawen hope to create an online research database of historical plant artworks. They call for contributions of art enthusiasts around the world via the social media. But they caution, the source paintings need to be realistic. "If you're going to use, for example, Picasso's paintings to try and understand what a pear looked like in the early 20th century, you might be misled." Instead, such an attempt could be fruitless.