Biogenic sulfur compounds dimethylsulfide (DMS), dimethylsulfoniopropionate (DMSP) and dimethylsulfoxide (DMSO) play key environmental roles on both a microscopic and global scale by maintaining cellular functions under stress exposure and regulating the climate through contributing to cloud formation in the atmosphere. These sulfur compounds can also influence phytoplankton-bacteria interactions, which in turn might dictate atmospheric DMS emissions. It is thus essential to understand how these compounds will be produced and consumed in a changing ocean. Alexandrium minutum is a dinoflagellate algae responsible for toxic red tides with the highest DMSP cell content on records.