However, twelve out of seventy-two is a very low percentage. The lack of infection could be for many different reasons. When a disease like Labyrinthula is cultured in a lab, it becomes less pathogenic over time. The two strains I used have been cultured for many years so it is possible they are not very infective anymore. Another possible reason is that the Labyrinthula didn't stick to the autoclaved eelgrass so when I attached the autoclaved eelgrass to the healthy piece, there wasn't any Labyrinthula to infect the plant. The last reason is that perhaps the eelgrass is extremely healthy. It isn't stressed by dessication or tidal fluctuation. Labyrinthula is an opportunistic infection so if the eelgrass hasn't been weakened, perhaps the Labyrinthula can't infect.
|An eelgrass piece that shows no sign of infection|
|The black spots could be Labyrinthula but it is not large enough to tell for sure|
|An eelgrass blade clipped to the autoclaved piece of eelgrass|