IIB   20738
INSTITUTO DE INVESTIGACIONES BIOLOGICAS
Unidad Ejecutora - UE
artículos
Título:
Phosphite compounds in potato resistance: Protection in seed tubers and foliage.
Autor/es:
LOBATO, M. C.; OLIVIERI, F. P.; GONZALEZ ALATAMIRANDA, E.; DALEO, G. R.; CALDIZ, D.; ANDREU A.B.
Revista:
European Journal of Plant Pathology
Editorial:
Springer
Referencias:
Lugar: Holanda; Año: 2008 vol. 122 p. 349 - 358
ISSN:
0929-1873
Resumen:
Phosphites (Phi) are alkali metal salts of phosphorous acid, with the ability to protect plants against different pathogens. In this research the effect of phosphites applied to potato plants on severity of three important potato diseases in Argentina was investigated. Seed tubers and foliage of potato cultivars Kennebec and Shepody were treated with Phi to assess effects on resistance against Phythophtora 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% v/v 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. Inductions in the expression of β-1,3-glucanases were detected at different times after treatment but no correlation between β-1,3-glucanases expression and foliar protection level was found. Although no significant differences were observed in plant growth between Phi treated and control plants at early stages, leaves from plants treated with CaPhi showed a darker green colour than leaves of control plants. In addition foliar Phi applications also produced an increase in Rubisco protein and a delay in crop senescence.