Plastid NDH Pseudogenization and Gene Loss in a Recently Derived Lineage from the Largest Hemiparasitic Plant Genus Pedicularis (Orobanchaceae)
| Autor: | Wen-Bin Yu, De-Zhu Li, Xin Li, Hong Wang, Jun-Bo Yang, Xin Yao, Yu Song, Richard T. Corlett |
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| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
0301 basic medicine Nuclear gene Physiology Lineage (evolution) Genome Plastid Hemiparasite Plant Science Biology Genes Plant AcademicSubjects/SCI01180 01 natural sciences Genome Evolution Molecular 03 medical and health sciences Monophyly Orobanchaceae NA(D)H dehydrogenase-like complex Regular Paper Plastids Plastid Pedicularis Phylogeny Pseudogenization AcademicSubjects/SCI01210 Relaxation of selection NADH Dehydrogenase Cell Biology General Medicine IR expansion biology.organism_classification 030104 developmental biology Chloroplast DNA Evolutionary biology Pseudogenes 010606 plant biology & botany |
| Zdroj: | Plant and Cell Physiology |
| ISSN: | 1471-9053 |
| Popis: | The plastid genome (plastome) is highly conserved in both gene order and content and has a lower mutation rate than the nuclear genome. However, the plastome is more variable in heterotrophic plants. To date, most such studies have investigated just a few species or only holoheterotrophic groups, and few have examined plastome evolution in recently derived lineages at an early stage of transition from autotrophy to heterotrophy. In this study, we investigated the evolutionary dynamics of plastomes in the monophyletic and recently derived Pedicularis sect. Cyathophora (Orobanchaceae). We obtained 22 new plastomes, 13 from the six recognized species of section Cyathophora, six from hemiparasitic relatives and three from autotrophic relatives. Comparative analyses of gene content, plastome structure and selection pressure showed dramatic differences among species in section Cyathophora and in Pedicularis as a whole. In comparison with autotrophic relatives and other Pedicularis spp., we found that the inverted repeat (IR) region in section Cyathophora had expansions to the small single-copy region, with a large expansion event and two independent contraction events. Moreover, NA(D)H dehydrogenase, accD and ccsA have lost function multiple times, with the function of accD being replaced by nuclear copies of an accD-like gene in Pedicularis spp. The ccsA and ndhG genes may have evolved under selection in association with IR expansion/contraction events. This study is the first to report high plastome variation in a recently derived lineage of hemiparasitic plants and therefore provides evidence for plastome evolution in the transition from autotrophy to heterotrophy. |
| Databáze: | OpenAIRE |
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