IIB   20738
INSTITUTO DE INVESTIGACIONES BIOLOGICAS
Unidad Ejecutora - UE
artículos
Título:
Potassium phosphIte increases tolerance to UV-B in potato
Autor/es:
OYARBURO, N.; MACHINANDIARENA, M.F.; FELDMAN, M.; DALEO, G. R.; ANDREU, A. B.; OLIVIERI, F. P.
Revista:
PLANT PHYSIOLOGY AND BIOCHEMISTRY
Editorial:
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
Referencias:
Lugar: Paris; Año: 2015 vol. 88 p. 1 - 8
ISSN:
0981-9428
Resumen:
The use of biocompatible chemical compounds that enhance plant disease resistance through Induced
Resistance (IR) is an innovative strategy to improve the yield and quality of crops. Phosphites (Phi), inorganic
salts of phosphorous acid, are environment friendly, and have been described to induce disease control. Phi,
similar to other plant inductors, are thought to be effective against different types of biotic and abiotic stress,
and it is assumed that the underlying signaling pathways probably overlap and interact. The signaling
pathways triggered by UV-B radiation, for instance, are known to crosstalk with other signaling routes that
respond that biotic stress. In the present work, the effect of potassium phosphite (KPhi) pre-treatment on
UV-B stress tolerance was evaluated in potato leaves. Plants were treated with KPhi and, after 3 days,
exposed to 2 h/day of UV-B (1.5Wattm2) for 0, 3 and 6 days. KPhi pre-treatment had a beneficial effect on
two photosynthetic parameters, specifically chlorophyll content and expression of the psbA gene. Oxidative
stress caused by UV-B was also prevented by KPhi. A decrease in the accumulation of hydrogen peroxide
(H2O2) in leaves and an increase in guaiacol peroxidase (POD) and superoxide dismutase (SOD) activities
were also observed. In addition, the expression levels of a gene involved in flavonoid synthesis increased in
UV-B-stressed plants only when pre-treated with KPhi. Finally, accumulation of glucanases and chitinases
was induced by UV-B stress and markedly potentiated by KPhi pre-treatment. Altogether, this is the first
report that shows a contribution of KPhi in UV-B stress tolerance in potato plants.