Truly blue chrysanthemums proved easier to make than researchers had thought.
Naonobu Noda/NARO
True blue flowers are a rarity in nature—they occur only in select species like morning glories and delphiniums. Now, researchers have created a genuinely blue chrysanthemum by adding two genes to the normally pink or reddish flower. The advance could be applied to other species—and it may mean that florists wanting to hawk blooms of blue will no longer have to dye them.
“This [advance] is of great impact,” says Toru Nakayama, a plant biochemist at Tohoku University in Sendai, Japan, who was not involved with the work. There are several popular commercial species for which no true blue varieties exist, he notes.
We all think we’ve seen blue flowers before. And in some cases, it’s true. But according to the Royal Horticultural Society’s color scale—the gold standard for flowers—most “blues” are really violet or purple. Florists and gardeners are forever on the lookout for new colors and varieties of plants, however, but making popular ornamental and cut flowers, like roses, vibrant blue has proved quite difficult. “We’ve all been trying to do this for a long time and it’s never worked perfectly,” says Thomas Colquhoun, a plant biotechnologist at the University of Florida in Gainesville who was not involved with the work.
True blue requires complex chemistry. Anthocyanins—pigment molecules in the petals, stem, and fruit—consist of rings that cause a flower to turn red, purple, or blue, depending on what sugars or other groups of atoms are attached. Conditions inside the plant cell also matter. So just transplanting an anthocyanin from a blue flower like a delphinium didn’t really work.
Naonobu Noda, a plant biologist at the National Agriculture and Food Research Organization in Tsukuba, Japan, tackled this problem by first putting a gene from a bluish flower called the Canterbury bell into a chrysanthemum. The gene’s protein modified the chrysanthemum’s anthocyanin to make the bloom appear purple instead of reddish. To get closer to blue, Noda and his colleagues then added a second gene, this one from the blue-flowering butterfly pea. This gene’s protein adds a sugar molecule to the anthocyanin. The scientists thought they would need to add a third gene, but the chrysanthemum flowers were blue with just the two genes, they report today in Science Advances.
“That allowed them to get the best blue they could obtain,” says Neil Anderson, a horticultural scientist at the University of Minnesota in St. Paul who was not involved with the work.
Chemical analyses showed that the blue color came about in just two steps because the chrysanthemums already had a colorless component that interacted with the modified anthocyanin to create the blue color. “It was a stroke of luck,” Colquhoun says. Until now, researchers had thought it would take many more genes to make a flower blue, Nakayama adds.
The next step for Noda and his colleagues is to make blue chrysanthemums that can’t reproduce and spread into the environment, making it possible to commercialize the transgenic flower. But that approach could spell trouble in some parts of the world. “As long as GMO [genetically modified organism] continues to be a problem in Europe, blue [flowers] face a difficult economic future,” predicts Ronald Koes, a plant molecular biologist at the University of Amsterdam who was not involved with the work. But others think this new blue flower will prevail. “It’s certainly an advance for the retail florist,” Anderson says. “It would have a lot of market value worldwide.”
As for Noda and other scientists, the blue blooms mean that at long last, they understand the biochemistry of this remarkable color.
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