Figure 4. Range of embryogenic activity observed in cell suspensions 3 weeks after treatment.

In order to assess carrot cell resistance to fungal toxins, carrot cell suspensions were tested for embryogenesis in the presence of fungal extracts and toxins. Embryogenesis was assessed 3 weeks after treatment, and compared to negative controls. Four levels of embryogenic activity were noted. A: (−) no embryogenesis was visible, cells were damaged, B: (+) early-stage embryogenic masses were visible, C: same as B, but after 6 weeks. D: (++) embryos were present, and E: (+++) embryogenesis was profuse.