Scientists Cultivate Beef Protein Inside Plants for Sustainable Meat Alternatives

Scientists have developed a method to grow beef muscle protein within edible plants, offering a new avenue for producing sustainable meat alternatives. Researchers at Imperial College London successfully engineered lettuce and tobacco plants to produce myoglobin, the protein responsible for meat's characteristic red color and umami flavor.

This breakthrough allows for the cultivation of an essential meat ingredient directly inside plant cells. "Plants can be engineered to produce the animal protein myoglobin (Mb) in their chloroplasts, the energy factories for photosynthesis," explained Dr. Alexia Groff, a researcher involved in the study. "This could provide a more sustainable way to produce an important ingredient for plant-based meat products."

The new technique contrasts with current methods that often rely on microbial engineering to produce meat proteins. In this study, the team focused on myoglobin, cloning genes from pigs and cattle. These genes were then introduced into the chloroplasts of tobacco and lettuce seedlings using a 'gene gun.' Tobacco was chosen as a model plant for developing the technology, while lettuce was selected as an edible crop with potential for future food ingredient production.

After the plants matured, their offspring inherited the myoglobin genes. Measurements indicated a yield of approximately 800mg/kg of tobacco and 810mg/kg of lettuce. While the protein yield is lower than that of conventional meat, the researchers emphasized the resource efficiency of plant cultivation.

"Plant-derived Mb could achieve protein yields per hectare that rival – or even potentially exceed – those of animal agriculture, while also benefiting from substantially lower water use and greenhouse gas emissions," the scientists stated.

Moving forward, the team plans to develop industrial purification methods to extract and refine the myoglobin from the plant leaves. This purified protein, identical to animal myoglobin, could then be incorporated into plant-based meat products to enhance their color, flavor, and nutritional profile.

Professor Derek Stewart, Co-Director of the National Alternative Protein Innovation Centre (NAPIC) at the James Hutton Institute, described the research as an "exciting step forward." He noted that the study successfully demonstrated the concept of using plants to produce myoglobin in a stable and scalable manner, and that the recovered protein was properly folded and bound to heme, which is crucial for meat-like characteristics.

The development comes at a time when reducing meat consumption is being discussed as a strategy for environmental sustainability. In the UK, for example, Energy Secretary Ed Miliband has highlighted the need for households to cut back on meat and dairy to meet legally binding carbon emission reduction targets.