Phosphite shifts physiological and hormonal profile of Monterey pine and delays Fusarium circinatum progression
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Otros documentos de la autoría: Cerqueira, Andreia; Alves, Artur; Berenguer, Helder; Correia, Barbara; Gomez-Cadenas, Aurelio; Díez-Casero, J. J.; Monteiro, Pedro; Pinto, Glória
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Título
Phosphite shifts physiological and hormonal profile of Monterey pine and delays Fusarium circinatum progressionAutoría
Fecha de publicación
2017Editor
ElsevierISSN
0981-9428; 1873-2690Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
http://www.sciencedirect.com/science/article/pii/S0981942817300700Palabras clave / Materias
Resumen
Fusarium circinatum is the causal agent of pitch canker disease affecting Pinus spp. and Pseudotsuga
menziesii worldwide. Under strict quarantine measures, alternative approaches for disease control are
necessary. ... [+]
Fusarium circinatum is the causal agent of pitch canker disease affecting Pinus spp. and Pseudotsuga
menziesii worldwide. Under strict quarantine measures, alternative approaches for disease control are
necessary. Phosphite (Phi) salts are known for their fungicidal activity and as plant resistance elicitors;
however, its potential is yet to be acknowledged in the Pinus-F. circinatum model. The main aim of this
study was to assess whether the application of a Phi-based commercial formulation would delay the
progression of the pitch canker on Pinus radiata plants, and on the in vitro fungal growth. In vitro assays
were performed using different Phi concentrations (1% and 4%) and a non-treated control (0%), and
repeated in vivo using inoculated and non-inoculated plants. Plant physiological parameters and hormonal
content were evaluated. Phi was effective at inhibiting in vitro mycelial growth in a dose
dependent manner. Regardless of fungal inoculation, Phi application induced positive effects on plant
performance, despite phytotoxic effects found at 4%. Fusarium circinatum infection led to a reduction in
gas exchange and chlorophyll fluorescence (Fv/Fm and 4PSII), while proline and hormone (JA, ABA and
SA) levels increased. Phi was effective in delaying disease symptom development in a dose dependent
manner, concurrent with in vitro observations: gas exchange and chlorophyll fluorescence (Fv/Fm) were
unaffected; proline, MDA and ABA decreased; electrolyte leakage and total soluble sugars increased. This
suggests a direct (pathogen growth inhibition) and indirect (host defense priming) action of Phi, showing
that Phi represents a potential strategy to control F. circinatum infection [-]
Publicado en
Plant Physiology and Biochemistry 114 (2017)Derechos de acceso
© 2017 Elsevier Masson SAS. All rights reserved.
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