The extremely reduced, diverged and reconfigured plastomes of the largest mycoheterotrophic orchid lineage.

ABSTRACT:

Background

Plastomes of heterotrophic plants have been greatly altered in structure and gene content, owing to the relaxation of selection on photosynthesis-related genes. The orchid tribe Gastrodieae is the largest and probably the oldest mycoheterotrophic clade of the extant family Orchidaceae. To characterize plastome evolution across members of this key important mycoheterotrophic lineage, we sequenced and analyzed the plastomes of eleven Gastrodieae members, including representative species of two genera, as well as members of the sister group Nervilieae.

Results

The plastomes of Gastrodieae members contain 20 protein-coding, four rRNA and five tRNA genes. Evolutionary analysis indicated that all rrn genes were transferred laterally and together, forming an rrn block in

SUBMITTER: Wen Y 

PROVIDER: S-EPMC9487142 | biostudies-literature | 2022 Sep

REPOSITORIES: biostudies-literature