title: The plastid genome of mycoheterotrophic monocot Petrosavia stellaris exhibits both gene losses and multiple rearrangements.
abstract: Plastid genomes of nonphotosynthetic plants represent a perfect model for studying evolution under relaxed selection pressure. However, the information on their sequences is still limited. We sequenced and assembled plastid genome of Petrosavia stellaris, a rare mycoheterotrophic monocot plant. After orchids, Petrosavia represents only the second family of nonphotosynthetic monocots to have its plastid genome examined. Several unusual features were found: retention of the ATP synthase genes and rbcL gene; extensive gene order rearrangement despite a relative lack of repeat sequences; an unusually short inverted repeat region that excludes most of the rDNA operon; and a lack of evidence for accelerated sequence evolution. Plastome of photosynthetic relative of P. stellaris, Japonolirion osense, has standard gene order and does not have the predisposition to inversions. Thus, the rearrangements in the P. stellaris plastome are the most likely associated with transition to heterotrophic way of life.
authors.affiliation: M.V. Lomonosov Moscow State University, Moscow, Russia.
authors.forename: Maria D
authors.initials: MD
authors.lastname: Logacheva
authors.forename: Mikhail I
authors.initials: MI
authors.lastname: Schelkunov
authors.forename: Maxim S
authors.initials: MS
authors.lastname: Nuraliev
authors.forename: Tagir H
authors.initials: TH
authors.lastname: Samigullin
authors.forename: Aleksey A
authors.initials: AA
authors.lastname: Penin
mesh_terms: D025222:Chloroplast Proton-Translocating ATPases / Q000235:genetics; D017353:Gene Deletion; D054627:Genome, Plastid; D056914:Genomic Structural Variation; D019684:Magnoliopsida / Q000145:classification / Q000201:enzymology / Q000235:genetics*; D010802:Phylogeny; D012091:Repetitive Sequences, Nucleic Acid; D012273:Ribulose-Bisphosphate Carboxylase / Q000235:genetics; D057345:Sequence Inversion
chemical_list: D025222:Chloroplast Proton-Translocating ATPases; C101625:RbcL protein, plastid; D012273:Ribulose-Bisphosphate Carboxylase
keywords: Petrosaviales; gene loss; genome rearrangements; mycoheterotrophy; plastid genome