Phosphite compounds reduce disease severity in potato seed tubers and foliage |
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Authors: | M C Lobato F P Olivieri E A González Altamiranda E A Wolski G R Daleo D O Caldiz A B Andreu |
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Institution: | (1) Instituto de Investigaciones Biológicas, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, Funes 3250, B7602AYJ Mar del Plata, Argentina;(2) Agronomy Division, McCain Argentina SA, Ruta 226 Km 61500, B7620EMA Balcarce, Argentina |
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Abstract: | 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 β-1,3-glucanases was induced at different times after treatment but no correlation between
β-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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Keywords: | Fusarium solani Phosphites Phytophthora infestans Protection Rhizoctonia solani Solanum tuberosum |
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