Nannochloropsis oceanica is an emerging model organism for photosynthetic Stramenopiles (heterokonts) and one of several species of the eustigmatophyte genus Nannochloropsis. These unicellular microalgae are widely considered to be promising potential feedstocks for the production of biofuels, nutraceuticals, and other bioproducts. N. oceanica has a relatively small genome of ~30 Mb ( and a rapidly developing molecular toolkit, including transformation, targeted gene replacement by homologous recombination, CRISPR/Cas9-based genome editing, and parts for synthetic biology. We are using this toolkit to investigate the regulation of light harvesting, carotenoid biosynthesis, and the carbon-concentrating mechanism in N. oceanica