CE	collision energy
CUR	curtain gas
CXP	collision cell exit potential
DAMs	differentially accumulated metabolites
DEGs	differentially expressed genes
DP	de-clustering potential
EP	entrance potential
ESI-QTRAP-MS/MS	electrospray ionization-triple quadrupole-linear ion trap MS/MS
GC-MS	gas chromatography-mass spectrometer
GO	gene ontology
GS1	ion source gas 1
GS2	ion source gas 2
HPLC-MS/MS	high-performance liquid chromatography coupled with tandem mass spectrometry
IS	ion spray voltage
KEGG	Kyoto encyclopedia of genes and genomes
LC-MS	liquid chromatograph-mass spectrometer
LIT	linear ion trap
LOD	limit of detection
LOQ	limit of quantification
NMR	nuclear magnetic resonance
OPLS-DA	orthogonal partial least squares discriminant
PCA	principal component analysis
PC1	principal component 1
PC2	principal component 2
PI	product ions
QC	quality control
QQQ	triple quadrupole
qRT-PCR	quantitative real-time polymerase chain reaction
RNA-seq	RNA-sequencing
RSDs	relative standard deviations
TEM	temperature
TIC	total ion chromatography
UPLC-ESI-MS/MS	ultra-performance liquid chromatography-electrospray ionization-tandem mass spectrometry
VIP	variable importance in project
cps	count per second
MRM	multiple reaction monitoring
psi	pounds per square inch
NM	non-mycorrhizal A. roxburghii
M	mycorrhizal A. roxburghii
PAL	phenylalanine ammonia-lyase
C4H	cinnamate 4-hydroxylase
4CL	4-coumarate CoA ligase
CHS	chalcone synthase
CHI	chalcone isomerase
F3′H	flavonoid 3′-hydroxylase
FNS	flavone synthase
F3H	flavanone 3-hydroxylase
FLS	flavonol synthase
GT	flavonoid 3-O-glucosyltransferase
RT	rhamnosyltransferase