HLB	Huanglongbing
CLas	Candidatus Liberibacter asiaticus
GC-MS	Gas chromatography-mass spectrometry
LC-MS	Liquid chromatography-mass spectrometry
PCA	Principal component analysis
OPLS-DA	Orthogonal partial least squares-discriminant analysis
KEGG	Kyoto Encyclopedia of Genes and Genomes
DAMs	Differentially accumulated metabolites/Differentially abundant metabolites
VIP	Variable importance in projection
PCR	Polymerase Chain Reaction
LAMP	Loop-mediated isothermal amplification
UPLC-QTOF-MSE	Ultra-performance liquid chromatography-quadrupole time-of-flight mass spectrometry in MSE mode
qPCR	Quantitative real-time PCR
TIC	Total ion current
ESI	Electrospray ionization
ELISA	Enzyme-linked immunosorbent assay
CTAB	Cetyltrimethylammonium bromide
NTC	No-template control
ddH2O	Double-distilled water
UHPLC	Ultra-high performance liquid chromatography
QC	Quality control
ISVF	Ion spray floating voltage
RSD	Relative standard deviation
EI	Electron impact ionization
HMDB	Human Metabolome Database