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De Nardi, B.; Dreos, R.; Del Terra, L.; Martellossi, C.; Asquini, E.; Tornincasa, P.; Gasperini, D.; Pacchioni, B.; Rathinavelu, R.; Pallavicini, A.; Graziosi, G. Differential responses of Coffea arabica L. leaves and roots to chemically induced systemic acquired resistance Genome 49, 1594-1605, (2006) DOI: 10.1139/g06-125
Coffea arabica is susceptible to several pests
and diseases, some of which affect the leaves and roots. Systemic
acquired resistance (SAR) is the main defence mechanism activated in
plants in response to pathogen attack. Here, we report the effects of
benzo(1,2,3)thiadiazole-7-carbothioic acid-s-methyl ester (BTH), a SAR
chemical inducer, on the expression profile of C. arabica. Two cDNA
libraries were constructed from the mRNA isolated from leaves and
embryonic roots to create 1587 nonredundant expressed sequence tags
(ESTs). We developed a cDNA microarray containing 1506 ESTs from the
leaves and embryonic roots, and 48 NBS-LRR (nucleotide-binding site
leucine-rich repeat) gene fragments derived from 2 specific genomic
libraries. Competitive hybridization between untreated and BTH-treated
leaves resulted in 55 genes that were significantly overexpressed and 16
genes that were significantly underexpressed. In the roots, 37 and 42
genes were over and underexpressed, respectively. A general shift in
metabolism from housekeeping to defence occurred in the leaves and roots
after BTH treatment. We observed a systemic increase in
pathogenesis-related protein synthesis, in the oxidative burst, and in
the cell wall strengthening processes. Moreover, responses in the roots
and leaves varied significantly.