Figure 11. Schematic illustrations to summarize the process of pheromonal interactions during sexual reproduction in Pseudostaurosira trainorii.

A. Vegetative female cells secrete ph-1 (shown in pink) which stimulates sexualization of male cells. B. Sexualized male cells secrete ph-2 (shown in blue) which stimulates sexualization of female cells. C. Sexualized female cells secrete a putative pheromone ph-3 (shown in light pink) which directs the male gametes and triggers their amoeboid movement.