Plastomes from tribe Plantagineae (Plantaginaceae) reveal infrageneric structural synapormorphies and localized hypermutation for Plantago and functional loss of ndh genes from Littorella
Plastomes from tribe Plantagineae (Plantaginaceae) reveal infrageneric structural synapormorphies and localized hypermutation for Plantago and functional loss of ndh genes from Littorella
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DOI：
10.1016/j.ympev.2021.107217
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发表时间：
2021-06-12
影响因子：
4.1
通讯作者：
Gonzalez，Favio
中科院分区：
文献类型：
--
作者：
Mower，Jeffrey P.;Guo，Wenhu;Gonzalez，Favio
Tribe Plantagineae (Plantaginaceae) comprises ~ 270 species in three currently recognized genera (Aragoa,Littorella,Plantago), of whichPlantagois most speciose.Plantagoplastomes exhibit several atypical features including large inversions, expansions of the inverted repeat, increased repetitiveness, intron losses, and gene-specific increases in substitution rate, but the prevalence of these plastid features among species and subgenera is unknown. To assess phylogenetic relationships and plastomic evolutionary dynamics among Plantagineae genera andPlantagosubgenera, we generated 25 complete plastome sequences and compared them with existing plastome sequences from Plantaginaceae. Using whole plastome and partitioned alignments, our phylogenomic analyses provided strong support for relationships among major Plantagineae lineages. General plastid features—including size, GC content, intron content, and indels—provided additional support that reinforced major Plantagineae subdivisions. Plastomes fromPlantagosubgeneraPlantagoandCoronopushave synapomorphic expansions and inversions affecting the size and gene order of the inverted repeats, and particular genes near the inversion breakpoints exhibit accelerated nucleotide substitution rates, suggesting localized hypermutation associated with rearrangements. TheLittorellaplastome lacks functional copies ofndhgenes, which may be related to an amphibious lifestyle and partial reliance on CAM photosynthesis.
