The plastid genome of mycoheterotrophic monocot Petrosavia stellaris exhibits both gene losses and multiple rearrangements

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. Afte...

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Bibliographic Details
Published in:Genome biology and evolution 2014-01, Vol.6 (1), p.238-246
Main Authors: Logacheva, Maria D, Schelkunov, Mikhail I, Nuraliev, Maxim S, Samigullin, Tagir H, Penin, Aleksey A
Format: Article
Language:English
Subjects:
Chloroplast Proton-Translocating ATPases - genetics
Gene Deletion
Genome Reports
Genome, Plastid
Genomic Structural Variation
Magnoliopsida - classification
Magnoliopsida - enzymology
Magnoliopsida - genetics
Phylogeny
Repetitive Sequences, Nucleic Acid
Ribulose-Bisphosphate Carboxylase - genetics
Sequence Inversion
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Summary: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.
ISSN:1759-6653
1759-6653
DOI:10.1093/gbe/evu001