Plastome Reduction in the Only Parasitic Gymnosperm Parasitaxus Is Due to Losses of Photosynthesis but Not Housekeeping Genes and Apparently Involves the Secondary Gain of a Large Inverted Repeat | |
Qu, Xiao-Jian1,2; Fan, Shou-Jin1; Wicke, Susann3; Yi, Ting-Shuang2 | |
通讯作者 | Wicke, Susann(susann.wicke@uni-muenster.de) ; Yi, Ting-Shuang(tingshuangyi@mail.kib.ac.cn) |
2019-10-01 | |
发表期刊 | GENOME BIOLOGY AND EVOLUTION |
ISSN | 1759-6653 |
卷号 | 11期号:10页码:2789-2796 |
摘要 | Plastid genomes (plastomes) of parasitic plants undergo dramatic reductions as the need for photosynthesis relaxes. Here, we report the plastome of the only known heterotrophic gymnosperm Parasitaxus usta (Podocarpaceae). With 68 unique genes, of which 33 encode proteins, 31 tRNAs, and four rRNAs in a plastome of 85.3-kb length, Parasitaxus has both the smallest and the functionally least capable plastid genome of gymnosperms. Although the heterotroph retains chlorophyll, all genes for photosynthesis are physically or functionally lost, making photosynthetic energy gain impossible. The pseudogenization of the three plastomeencoded light-independent chlorophyll biosynthesis genes chIB, chIL, and chiN implies that Parasitaxus relies on either only the light-dependent chlorophyll biosynthesis pathway or another regulation system. Nesting within a group of gymnosperms known for the absence of the large inverted repeat regions (IRs), another unusual feature of the Parasitaxus plastome is the existence of a 9,256 bp long IR. Its short length and a gene composition that completely differs from those of IR-containing gymnosperms together suggest a regain of this critical, plastome structure-stabilizing feature. In sum, our findings highlight the particular path of lifestyle associated reductive plastome evolution, where structural features might provide additional cues of a continued selection for plastome maintenance. |
关键词 | plastome parasitism mycoheterotrophy gene loss Parasitaxus |
DOI | 10.1093/gbe/evz187 |
收录类别 | SCI ; SCI |
语种 | 英语 |
WOS记录号 | WOS:000504448300008 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://ir.kib.ac.cn/handle/151853/70659 |
专题 | 中国西南野生生物种质资源库 |
通讯作者 | Wicke, Susann; Yi, Ting-Shuang |
作者单位 | 1.Shandong Normal Univ, Coll Life Sci, Key Lab Plant Stress Res, Jinan, Shandong, Peoples R China 2.Chinese Acad Sci, Kunming Inst Bot, Germplasm Bank Wild Species, Kunming, Yunnan, Peoples R China 3.Univ Munster, Inst Evolut & Biodivers, Munster, Germany |
推荐引用方式 GB/T 7714 | Qu, Xiao-Jian,Fan, Shou-Jin,Wicke, Susann,et al. Plastome Reduction in the Only Parasitic Gymnosperm Parasitaxus Is Due to Losses of Photosynthesis but Not Housekeeping Genes and Apparently Involves the Secondary Gain of a Large Inverted Repeat[J]. GENOME BIOLOGY AND EVOLUTION,2019,11(10):2789-2796. |
APA | Qu, Xiao-Jian,Fan, Shou-Jin,Wicke, Susann,&Yi, Ting-Shuang.(2019).Plastome Reduction in the Only Parasitic Gymnosperm Parasitaxus Is Due to Losses of Photosynthesis but Not Housekeeping Genes and Apparently Involves the Secondary Gain of a Large Inverted Repeat.GENOME BIOLOGY AND EVOLUTION,11(10),2789-2796. |
MLA | Qu, Xiao-Jian,et al."Plastome Reduction in the Only Parasitic Gymnosperm Parasitaxus Is Due to Losses of Photosynthesis but Not Housekeeping Genes and Apparently Involves the Secondary Gain of a Large Inverted Repeat".GENOME BIOLOGY AND EVOLUTION 11.10(2019):2789-2796. |
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