Targeted Metabolic Profiles of the Leaves and Xylem Sap of Two Sugarcane Genotypes Infected with the Vascular Bacterial Pathogen Leifsonia xyli subsp. xyli

Autor(es)

Castro-Moretti, Fernanda R. ^{[1, 2]} ; Cocuron, Jean-Christophe ^[1] ; Cia, Mariana C. ^[3] ; Cataldi, Thais R. ^[4] ; Labate, Carlos A. ^[4] ; Alonso, Ana Paula ^{[1, 2]} ; Camargo, Luis E. A. ^[5]

Afiliação do(s) autor(es)

^[1] Univ North Texas, Dept Biol Sci, 1504 W Mulberry St, Denton, TX 76201 - USA

^[2] Univ North Texas, BioDiscovery Inst, 1504 W Mulberry St, Denton, TX 76201 - USA

^[3] Ctr Tecnol Canavieira, BR-13418970 Piracicaba - Brazil

^[4] Univ Sao Paulo, Luiz de Queiroz Coll Agr, Dept Genet, Ave Padua Dias 11, BR-13418900 Piracicaba - Brazil

^[5] Univ Sao Paulo, Luiz de Queiroz Coll Agr, Dept Plant Pathol & Nematol, Ave Padua Dias 11, BR-13418900 Piracicaba - Brazil

• Tipo de documento: Artigo Científico
• Fonte: METABOLITES; v. 11, n. 4 APR 2021.
• Citações Web of Science: 0

Resumo

Ratoon stunt (RS) is a worldwide disease that reduces biomass up to 80% and is caused by the xylem-dwelling bacterium Leifsonia xyli subsp. xyli. This study identified discriminant metabolites between a resistant (R) and a susceptible (S) sugarcane variety at the early stages of pathogen colonization (30 and 120 days after inoculation-DAI) by untargeted and targeted metabolomics of leaves and xylem sap using gas chromatography-mass spectrometry (GC-MS) and liquid chromatography-tandem mass spectrometry (LC-MS/MS), respectively. Bacterial titers were quantified in sugarcane extracts at 180 DAI through real-time polymerase chain reaction. Bacterial titers were at least four times higher on the S variety than in the R one. Global profiling detected 514 features in the leaves and 68 in the sap, while 119 metabolites were quantified in the leaves and 28 in the sap by targeted metabolomics. Comparisons between mock-inoculated treatments indicated a greater abundance of amino acids in the leaves of the S variety and of phenolics, flavonoids, and salicylic acid in the R one. In the xylem sap, fewer differences were detected among phenolics and flavonoids, but also included higher abundances of the signaling molecule sorbitol and glycerol in R. Metabolic changes in the leaves following pathogen inoculation were detected earlier in R than in S and were mostly related to amino acids in R and to phosphorylated compounds in S. Differentially represented metabolites in the xylem sap included abscisic acid. The data represent a valuable resource of potential biomarkers for metabolite-assisted selection of resistant varieties to RS. (AU)

• Processo FAPESP: 15/18681-0 - Análises funcionais no patossistema cana-de-açúcar - Leifsonia xyli subsp. xyli: alterações metabólicas e celulares no hospedeiro e respostas a estresse oxidativo e osmótico no patógeno
• Beneficiário: Luis Eduardo Aranha Camargo
• Modalidade de apoio: Auxílio à Pesquisa - Regular