The complete chloroplast genome sequence of Cephalotaxus oliveri (Cephalotaxaceae): evolutionary comparison of cephalotaxus chloroplast DNAs and insights into the loss of inverted repeat copies in gymnosperms.

ABSTRACT: We have determined the complete chloroplast (cp) genome sequence of Cephalotaxus oliveri. The genome is 134,337 bp in length, encodes 113 genes, and lacks inverted repeat (IR) regions. Genome-wide mutational dynamics have been investigated through comparative analysis of the cp genomes of C. oliveri and C. wilsoniana. Gene order transformation analyses indicate that when distinct isomers are considered as alternative structures for the ancestral cp genome of cupressophyte and Pinaceae lineages, it is not possible to distinguish between hypotheses favoring retention of the same IR region in cupressophyte and Pinaceae cp genomes from a hypothesis proposing independent loss of IRA and IRB. Furthermore, in cupressophyte cp genomes, the highly reduced IRs are replaced by short repeats that have

SUBMITTER: Yi X 

PROVIDER: S-EPMC3641632 | biostudies-literature | 2013

REPOSITORIES: biostudies-literature