Table 1.

Numbers of unique metabolites in uninfested M. sativa, T. pratense, P. sativum and V. faba plants and their putative chemical classification.

	Negative ionization mode		Positive ionization mode
Plant species	Number of unique metabolites	Putative chemical class	Number of unique metabolites	Putative chemical class
Medicago sativa	47	Triterpene saponins	24	Triterpene saponins
	2	Steroidal saponins	14	Flavonoids
	9	Flavonoids	4	Peptides
	4	Peptides	1	Non-proteinogenic amino acid
	1	Benzoic acid ester	43	Unknowns
	1	Prostaglandin-like compound
	1	Diterpene
	1	Lignan glycoside
	41	Unknowns
	Σ 107		Σ 86
Trifolium pratense	48	Flavonoids	31	Flavonoids
	6	Peptides	1	Phenolic glycoside
	2	Hydroxycinnamic acid esters	51	Unknowns
	2	Triterpene saponins
	45	Unknowns
	Σ 103		Σ 83
Pisum sativum	22	Flavonoids	20	Flavonoids
	3	Peptides	2	Peptides
	32	Unknowns	31	Unknowns
	Σ 57		Σ 53
Vicia faba	6	Flavonoids	12	Flavonoids
	1	Peptide	6	Peptides
	6	Unknowns	49	Unknowns
	Σ 13		Σ 67

Retention times, m/z values and putative chemical class of the compounds can be found in Supplementary Table 1.