Potential host range and the effect of temperature on the pathogenicity of Phytophthora pseudocryptogea and its close relatives

Delshad, D.; Mostowfizadeh-Ghalamfarsa, R.; Safaiefarahani, B.

Potential host range and the effect of temperature on the pathogenicity of Phytophthora pseudocryptogea and its close relatives

2020

Delshad, D. | Mostowfizadeh-Ghalamfarsa, R. | Safaiefarahani, B.

Phytophthora pseudocryptogea, a member of clade 8a of the Phytophthora phylogenetic tree, was formally described in 2015 as a close relative of P. cryptogea and P. erythroseptica. The potential host range of this newly described species and its close relatives was investigated in this study. Thirty species of herbaceous plants and nine species of woody plants were inoculated and monitored for development of foliar symptoms and root rots. Also, we inoculated the detached twigs of 21 tree species, fruit of six plant species, tubers of potato, and roots of carrot and sugar beet. Our results showed P. pseudocryptogea, P. cryptogea and P. erythroseptica had different potential host ranges, though all were pathogenic on some plant species such as pistachio, tomato, potato, eggplant, spinach and clover. Additionally, some plant species were able to discriminate P. pseudocryptogea from P. cryptogea including cucumber, melon, watermelon, alfalfa, soybean, cabbage, green pepper, and rice. These plants showed susceptibility to P. pseudocryptogea and resistance to P. cryptogea. Different species showed different virulence levels on detached tree twigs; however, almost all species caused severe rot on all tested fruits, tubers and roots. Investigation of the effects of root-zone temperature on the virulence of species showed that a temperature of 20 °C in increased root rot and root colonization in P. pseudocryptogea and P. erythroseptica, while P. cryptogea caused the most root rot and colonization at 25 °C.

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