Phytophthora betacei, a new species within Phytophthora clade 1c causing late blight on Solanum betaceum in Colombia

. 2018 Feb 1;41:39–55. doi: 10.3767/persoonia.2018.41.03

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Fig. 7 — Host specialisation results in strong premating reproductive isolation of *P. infestans*, *P. betacei* and *P. andina* isolates. a. Fitness obtained from reciprocal infection assays. Results of infection for *P. infestans*, *P. betacei* and *P. andina* (EC-3 clonal lineage) on the main hosts evaluated: potatoes (*S. tuberosum*), tomatoes (*S. lycopersicum*) and tree tomatoes (*S. betaceum*) after 9d post inoculation (dpi). The isolates of *P. andina* of the EC-2 clonal lineage did not produce any symptoms on any of the hosts; b. values of fitness (sporangia per day) for *P. infestans*, *P. betacei* and *P. andina* (EC-2 and EC-3 clonal lineages). On tree tomato, isolates of *P. betacei* showed significantly higher fitness than *P. infestans* and *P. andina* (EC-3 clonal lineage). Conversely, isolates of *P. betacei* are unable to infect other hosts where *P. infestans* thrives. Additionally, *P. andina* (EC-3 clonal lineage) shows significantly lower fitness on all hosts tested.

Fig. 7.