Breaking from its industry rivals, Campbell Soup will become the first major food company to begin disclosing the presence of genetically engineered ingredients like corn, soy and sugar beets in its products.

The company, the maker of brands like Pepperidge Farm, Prego, Plum Organics and V8 in addition to its namesake soups, is taking the unusual step — and possibly risking sales by alienating consumers averse to genetically modified organisms — as big food corporations face increasing pressure to be more open about their use of such ingredients.

Food companies have begun printing labels to comply with a new labeling law in Vermont, which has become a battleground over labeling that other states have been watching closely. Beginning in July, Vermont will require disclosure of genetically engineered ingredients, a measure opposed by most major food companies, which are seeking to supersede any state’s legislation with a voluntary federal solution.

Campbell is also breaking with its peers by calling for federal action to make mandatory a uniform labeling system of foods that contain such ingredients, commonly known as GMO labeling, said Denise Morrison, chief executive of Campbell.

“We’re optimistic that a federal solution can be reached in a reasonable amount of time, but if that’s not the case, we’re preparing to label all our products across the portfolio,” Morrison said in an interview.