With the expansion of seaweed culture and changes in the global climate, large quantities of new seaweed germplasm are urgently needed. It is important to elucidate the process of reproductive development and its regulatory mechanism in seaweed. Gracilariopsis lemaneiformis (Rhodophyta) has an essential economic and ecological value, for example, as a raw material for agar extraction and abalone feed. Here, four phases (I to I...