Abstract:
MAIN CONCLUSION:We demonstrate that rbcL underwent strong positive selection during the C 3 -C 4 photosynthetic transitions in PACMAD grasses, in particular the 3' end of the gene. In contrast, selective pressures on other plastid genes vary widely and environmental drivers remain to be identified. Plastid genomes have been widely used to infer phylogenetic relationships among plants, but the selective pressures driving their evolution have not been systematically investigated. In our study, we analyse all protein-coding plastid genes from 113 species of PACMAD grasses (Poaceae) to evaluate the selective pressures driving their evolution. Our analyses confirm that the gene encoding the large subunit of RubisCO (rbcL) evolved under strong positive selection after C3-C4 photosynthetic transitions. We highlight new codons in rbcL that underwent parallel changes, in particular those encoding the C-terminal part of the protein. C3-C4 photosynthetic shifts did not significantly affect the evolutionary dynamics of other plastid genes. Instead, while two-third of the plastid genes evolved under purifying selection or neutrality, 25 evolved under positive selection across the PACMAD clade. This set of genes encode for proteins involved in diverse functions, including self-replication of plastids and photosynthesis. Our results suggest that plastid genes widely adapt to changing ecological conditions, but factors driving this evolution largely remain to be identified.
journal_name
Plantajournal_title
Plantaauthors
Piot A,Hackel J,Christin PA,Besnard Gdoi
10.1007/s00425-017-2781-xsubject
Has Abstractpub_date
2018-01-01 00:00:00pages
255-266issue
1eissn
0032-0935issn
1432-2048pii
10.1007/s00425-017-2781-xjournal_volume
247pub_type
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