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The effect of mandelonitrile, a recently described salicylic acid precursor, on peach plant response against abiotic and biotic stresses
Author(s) -
BernalVicente A.,
Cantabella D.,
Hernández J. A.,
DiazVivancos P.
Publication year - 2018
Publication title -
plant biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.871
H-Index - 87
eISSN - 1438-8677
pISSN - 1435-8603
DOI - 10.1111/plb.12894
Subject(s) - salicylic acid , abiotic component , chlorophyll fluorescence , biology , quenching (fluorescence) , abiotic stress , photosynthesis , quantum yield , botany , phenylalanine , horticulture , biotic stress , biochemistry , fluorescence , amino acid , paleontology , physics , quantum mechanics , gene
In a previous work, we observed that mandelonitrile ( MD ), which controls cyanogenic glycoside turnover, is involved in salicylic acid ( SA ) biosynthesis in peach plants. In order to gain knowledge about the possible roles of this SA biosynthetic pathway, this current study looks at the effect of MD and phenylalanine (Phe; MD precursor) treatments on peach plant performance from an agronomic point of view. Abiotic (2 g·l −1 NaCl) and biotic ( Plum pox virus , PPV ) stresses were assayed. We recorded the following chlorophyll fluorescence parameters: quantum yield of photochemical energy conversion in PSII [Y( II )], photochemical quenching ( qP ) and quantum yield of regulated non‐photochemical energy loss in PSII and its coefficient [Y( NPQ ) and qN ]. In addition, considering that environmental stresses lead to nutritional disorders, we determined the soluble K + , Ca 2+ , Na + and Cl − concentrations in NaCl‐stressed seedlings. In PPV ‐infected seedlings, we recorded the Ca 2+ level, which has been suggested to play critical roles in regulating SA ‐related plant defence responses against pathogens. The MD treatment lessened the effect of both stresses on plant development. In addition, an increase in non‐photochemical quenching parameters was observed in MD ‐treated seedlings, suggesting a safer dissipation of excess energy under stress conditions. In NaCl‐stressed peach seedlings both treatments stimulated the accumulation of phytotoxic ions in roots, whereas in PPV ‐infected seedlings MD increased Ca 2+ content. Our results suggest that MD and Phe influence the response of peach seedlings to the deleterious effects of salt and PPV infection stresses.