Table 1.

Peppermint ESTs related to monoterpene and sesquiterpene biosynthesis

EST identification	Total number of hits (of 1,250)	Redundancy, ‰
DXP synthase	11	8.8
DXP reductoisomerase*	—	0.7
Isopentenyl monophosphate kinase	2	1.6
IPP isomerase	2	1.6
Geranyl diphosphate synthase  (small subunit)	4	3.2
Geranyl diphosphate synthase  (large subunit)	4	3.2
Farnesyl diphosphate synthase	3	2.4
Monoterpene synthases (total)	37	29.6
(−)-Limonene synthase (isoenzyme 1)	18	14.4
(−)-Limonene synthase (isoenzyme 2)	12	9.6
1,8-Cineole synthase	2	1.6
Sesquiterpene synthases (total)	12	9.6
β-Farnesene synthase	2	1.6
(−)-Limonene-3-hydroxylase	77	61.1
(+)-Menthofuran synthase	10	8.0
(−)-Isopiperitenone reductase	28	22.4
(+)-Pulegone reductase	14	11.2
(−)-Menthol acetyltransferase	4	3.2

^*This clone was not obtained as part of the EST sequencing project. A cDNA library screen revealed an abundance of one in 1,500 clones (0.7‰).