Table 1. Essential oil composition of WT peppermint and representative transgenic plants that overexpress (HMF) or cosuppress (LMF) MFS.

	Immature leaves†			Mature leaves†			Pooled leaves‡
Monoterpene component*	WT	HMF	LMF	WT	HMF	LMF	WT	HMF	LMF
Limonene	5.5	3.5	8.7	0.9	0.6	1.6	1.1	1.4	2.2
1,8-Cineole	1.7	3.5	1.6	9.5	9.7	7.7	7.2	3.7	6.5
Menthone	71.4	55.5	67.5	25.6	29.6	6.3	14.5	18.3	46.6
Sabinene hydrate	3.4	2.9	2.4	5.6	4.2	4.4	4.4	2.2	3.3
Menthofuran	6.4	15.4	0.3	2.3	2.4	n.d.	24.3	42.3	0.4
Isomenthone	5.3	4.3	1.6	4.3	4.4	0.2	1.8	2.2	0.7
Neomenthol	0.2	0.2	0.4	2.6	2.5	5.3	0.6	0.4	1.8
Pulegone	3.7	10.7	1.0	n.d.	n.d.	n.d.	35.0	22.1	9.9
Menthol	0.9	2.5	3.0	48.4	45.2	64.1	9.9	6.5	19.7
Piperitone	1.0	0.8	2.1	0.9	1.3	1.7	0.4	0.2	1.0
trans-Piperitone oxide	n.d.	n.d.	8.4	n.d.	n.d.	5.4	n.d.	n.d.	6.2
Piperitenone oxide	n.d.	n.d.	0.4	n.d.	n.d.	n.d.	n.d.	n.d.	0.1

n.d., Not detected (<0.1%).

^*Concentration of each oil component is expressed as percentage of total oil

^†These plants were grown under optimal conditions

^‡These plants were grown under stress conditions