CAMBRIDGE, Mass.--(BUSINESS WIRE)--Metabolix, Inc. (NASDAQ: MBLX) today announced that in recently-completed greenhouse trials, switchgrass plants engineered using Metabolix multi-gene expression technology produced significant amounts of PHA bioplastics in leaf tissues employing Metabolix’s expertise in pathway engineering in plants. This result is the first successful expression of a new functional multi-gene pathway in switchgrass, and demonstrates the Company’s pathbreaking bioengineering capabilities as a powerful tool for maximizing the potential of biomass crops for both bioplastics and biofuels production.