Mitochondrial genome evolution in parasitic plants

被引:43
|
作者
Zervas, Athanasios [1 ]
Petersen, Gitte [1 ]
Seberg, Ole [1 ]
机构
[1] Univ Copenhagen, Fac Sci, Nat Hist Museum Denmark, Solvgade 83,Opg S, DK-1307 Copenhagen K, Denmark
关键词
Phylogeny; Parasitic plants; Substitution rates; Evolution; Parasitism; Balanophoraceae; Viscaceae; Mitogenome; PLASTID GENOME; NUCLEOTIDE SUBSTITUTION; CHLOROPLAST; PHYLOGENY; SEQUENCE; GENES; RATES; CLASSIFICATION; DIVERGENT; L;
D O I
10.1186/s12862-019-1401-8
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
BackgroundParasitic plants rely on their host to cover their nutritional requirements either for their entire life or a smaller part of it. Depending on the level of parasitism, a proportional reduction on the plastid genome has been found. However, knowledge on gene loss and evolution of the mitogenome of parasitic plants is only available for four hemiparasitic Viscum species (Viscaceae), which lack many of the mitochondrial genes, while the remaining genes exhibit very fast molecular evolution rates. In this study, we include another genus, Phoradendron, from the Viscaceae, as well as 10 other hemiparasitic or holoparasitic taxa from across the phylogeny of the angiosperms to investigate how fast molecular evolution works on their mitogenomes, and the extent of gene loss.ResultsOur observations from Viscum were replicated in Phoradendron liga, whereas the remaining parasitic plants in the study have a complete set of the core mitochondrial genes and exhibit moderate or only slightly raised substitution rates compared to most autotrophic taxa, without any statistically significant difference between the different groups (autotrophs, hemiparasites and holoparasites). Additionally, further evidence is provided for the placement of Balanophoraceae within the order Santalales, while the exact placement of Cynomoriaceae still remains elusive.ConclusionsWe examine the mitochondrial gene content of 11 hemiparasitic and holoparasitic plants and confirm previous observations in Viscaceae. We show that the remaining parasitic plants do not have significantly higher substitution rates than autotrophic plants in their mitochondrial genes. We provide further evidence for the placement of Balanophoraceae in the Santalales.
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页数:14
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