A few days ago, I saw a paper discussing the low temperature "vernalization" of microalgae (cyanobacteria). But in the paper, only low temperatures induced the growth effect of cyanobacteria was disscussed. That's an interesting topic. By definition, vernalization is the phenomenon by which certain higher plants must undergo a period of sustained hypothermia before they transition from vegetative to reproductive growth. But species of cyanobacteria have no clear reproductive growth. It made me wonder. Do algae, including macroalgae, have true vernalization like higher plants? If so, how does it work?