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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Rapid differentiation of graft Citrus sinensis with and without Xylella fastidiosa infection by mass spectrometry

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Soares, Marcio Santos [1] ; da Silva, Danielle Fernandes [1] ; Amaral, Jessica Cristina [1] ; da Silva, Michelli Masaroli [1] ; Forim, Moacir Rossi [1] ; Rodrigues-Filho, Edson [1] ; das Gracas Fernandes da Silva, Maria Fatima [1] ; Fernandes, Joao Batista [1] ; Machado, Marcos Antonio [2] ; de Souza, Alessandra Alves [2] ; Gomes Martins, Carlos Henrique [3]
Total Authors: 11
[1] Univ Fed Sao Carlos, Dept Quim, CP 676, BR-13565905 Sao Carlos, SP - Brazil
[2] Ctr APTA Citros Sylvio Moreira, Inst Agron, CP 04, BR-13490970 Cordeiropolis, SP - Brazil
[3] Univ Franca, Ctr Pesquisa Ciencias Exatas & Tecnol, BR-14404600 Franca, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Web of Science Citations: 0

Rationale Xylella fastidiosa causes citrus variegated chlorosis (CVC) in sweet orange trees. A diagnostic method for detecting CVC before the symptoms appear, which would inform citrus producers in advance about when the plant should be removed from the orchard, is essential for reducing pesticide application costs. Methods Chemometrics was applied to high-performance liquid chromatography diode array detector (HPLC-DAD) data to evaluate the similarities and differences between the chromatographic profiles. A liquid chromatography/atmospheric pressure chemical ionization mass spectrometry selected reaction monitoring (LC/APCI-MS-SRM) method was developed to identify the major compounds and to determine their amounts in all samples. Results We evaluated the effect of this bacterium on the variation in the chemical profile in citrus plants. The organs of C. sinensis grafted on C. limonia were analyzed. Chemometrics was applied to the obtained data, and two major groups were differentiated. Flavonoids were observed in one group (leaves) and coumarins in the second (roots), both at higher concentrations in the plants with CVC symptoms than in those without the symptoms and those in the negative control. The rootstocks also interfered in the metabolism of the scion. Conclusions The developed LC/APCI-MS-SRM method for detecting CVC before the symptoms appear is simple and accurate. It is inexpensive, and many samples can be screened per hour using 1 mg of leaves. Knowledge of the influence of the rootstock on the chemical profile of the graft is limited. This study demonstrates the effect of the rootstock in synthesizing flavonoids and increasing its content in all parts of the graft. (AU)

FAPESP's process: 14/50249-8 - Green chemistry: sustainable synthetic methods employing benign solvents, safer reagents, and bio-renewable feedstock
Grantee:Arlene Gonçalves Corrêa
Support type: Research Grants - Research Centers in Engineering Program
FAPESP's process: 12/25299-6 - Integrated studies for leaf cutting control
Grantee:João Batista Fernandes
Support type: Research Projects - Thematic Grants