Journal
EUROPEAN JOURNAL OF PLANT PATHOLOGY
Volume 122, Issue 3, Pages 349-358Publisher
SPRINGER
DOI: 10.1007/s10658-008-9299-9
Keywords
Fusarium solani; Phosphites; Phytophthora infestans; Protection; Rhizoctonia solani; Solanum tuberosum
Categories
Funding
- Consejo Nacional de Investigaciones Cientificas y Tecnologicas (CONICET)
- Comision de Investigaciones Cientificas de la Provincia de Buenos Aires (CIC)
- Universidad Nacional de Mar del Plata (UNMdP)
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Phosphites (Phi) are alkali metal salts of phosphorous acid, with the ability to protect plants against different pathogens. In this research, the effect of Phi applied to potato plants on severity of three important potato diseases in Argentina was assessed. Seed tubers and foliage of potato cvs Shepody and Kennebec were treated with Phi to assess effects on resistance against Phytophthora infestans, Fusarium solani and Rhizoctonia solani. Protection resulting from Phi treatment in seed tubers was high against P. infestans, intermediate against F. solani, and low against R. solani. In addition, seed tubers treated with calcium or potassium phosphites (CaPhi and KPhi, respectively) at 1% of commercial product emerged earlier than untreated ones. When Phi were foliarly applied two or four times at different doses, high levels of protection against P. infestans were achieved in both cultivars. Higher protection was observed in Kennebec when CaPhi was applied, while in Shepody this was true for KPhi. Expression of beta-1,3-glucanases was induced at different times after treatment but no correlation between beta-1,3-glucanases expression and foliar protection level was found. On the other hand, Phi positive protection effects did not produce negative effects in plant growth. Leaves from CaPhi-treated plants showed a darker green colour than leaves from control plants; also an increase in Rubisco protein and a delay in crop senescence was observed.
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