Although the ndhF
gene is conservatively located at the small single copy (SSC) region
of the published chloroplast genomess, e.g. Oryza sativa [94],
Amborella trichopoda [95], Nymphaea alba [96] and Acorus calamus [97],
it was reported to have been lost in the sequenced chloroplast
genomes of the four orchids Phalaenopsis aphrodite [98], Oncidium
Gower Ramsey [99], Rhizanthella gardneri [100] and Neottia nidus-avis
[101].