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metadata.artigo.dc.title: Metabolic profiling in the roots of coffee plants exposed to the coffee root-knot nematode, Meloidogyne exigua
metadata.artigo.dc.creator: Machado, Alan Rodrigues Teixeira
Campos, Viviane Aparecida Costa
Silva, Willian José Rodrigues da
Campos, Vicente Paulo
Zeri, Ana Carolina de Mattos
Oliveira, Denilson Ferreira
metadata.artigo.dc.subject: Root-knot nematode
Coffee - Genetic improvment
Nematodes - Resistance
Nematóide de nó de raiz
Café - Melhoramento genético
Nematóides - Resistência
metadata.artigo.dc.publisher: Springer Oct-2012
metadata.artigo.dc.identifier.citation: MACHADO, A. R. T. et al. Metabolic profiling in the roots of coffee plants exposed to the coffee root-knot nematode, Meloidogyne exigua. Dordrecht, v. 134, n. 2, p. 431-441, Oct. 2012.
metadata.artigo.dc.description.abstract: To understand the effect of nematode Meloidogyne exigua infestation on coffee plants, resistant and susceptible coffee seedlings were inoculated with second-stage juveniles of M. exigua, and root metabolites were studied for four time intervals at 0, 24, 48 and 96 h. During this important period for parasite establishment, the concentrations of phenols, carbohydrates, amino acids and alkaloids in the roots were measured, and hydrogen nuclear magnetic resonance spectra of the root extracts were used to identify and quantify other metabolites. One of the most striking changes was the concentration of fumaric acid on resistant plants, which varied from 59 μg g(of root)−1 to 138 μg g(of root)−1 during the first 24 h of the nematode inoculation. The same level of variation was observed much later (96 h) in susceptible plants. Similarly, formic and quinic acid concentrations increased more rapidly in the resistant plants compared to the susceptibles. Sucrose concentrations increased to 370 % in the first 48 h in the resistant plants but showed no significant variation in the susceptible plant. Besides, the concentration of alkaloids was much higher at 24 and 48 h in the susceptibles compared to the resistant plants. These results suggest that the higher production of sucrose as well as formic, fumaric and quinic acids, and the lower production of alkaloids by the resistant cultivar in the first 48 h after the nematode inoculation are associated with the resistance of coffee plants to M. exigua.
metadata.artigo.dc.language: en_US
Appears in Collections:DQI - Artigos publicados em periódicos

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