Prickly lettuce¹, a common weed that has long vexed² farmers, has potential as a new cash crop providing raw material for rubber production, according to Washington State University scientists. Writing in the Journal of Agricultural and Food Chemistry, they describe regions in the plant's genetic³ code linked to rubber production. The findings open the way for breeding for desired traits and developing a new crop source for rubber in the Pacific Northwest.

 

"I think there's interest in developing a temperate-climate source of natural rubber," said Ian Burke, a weed scientist at WSU and a study author. "It would be really great if prickly lettuce could become one of those crops."

 

 

When the lettuce we eat and grow in our gardens bolts, a milky⁴ white sap bleeds from the stem. In prickly lettuce, the wild relative and ancestor of cultivated lettuce, this same substance could prove to be an economically viable⁵ source of natural rubber and help alleviate⁶ a worldwide threat to rubber production.

 

Natural rubber is the main ingredient for many everyday products, from boots to condoms to surgical⁷ gloves. Roughly 70 percent of the global supply of rubber is used in tires.

 

But more than half of rubber products are made from synthetic⁸ rubber derived⁹ from petrochemical sources. And the largest source of natural rubber, the Brazilian rubber tree, is threatened by disease.

 

Burke has reviewed many studies of prickly lettuce and its cultivated cousins, but one in particular gave him an idea. A study published in 2006 found that the latex in prickly lettuce was very similar to the polymers found in natural rubber.

 

"It occurred to me that we could grow the heck out of prickly lettuce in eastern Washington," he said.

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