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

doi:10.1093/gbe/evz187

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	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-Jian 1,3; Fan, Shou-Jin 3; Wicke, Susann 2; Yi, Ting-Shuang 1
刊名	GENOME BIOLOGY AND EVOLUTION
	2019-10-01
卷号	11 期号:10 页码:2789-2796
关键词	plastome parasitism mycoheterotrophy gene loss Parasitaxus
ISSN号	1759-6653
DOI	10.1093/gbe/evz187
通讯作者	Wicke, Susann(susann.wicke@uni-muenster.de) ; Yi, Ting-Shuang(tingshuangyi@mail.kib.ac.cn)
英文摘要	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.
WOS研究方向	Evolutionary Biology ; Genetics & Heredity
语种	英语
WOS记录号	WOS:000504448300008
内容类型	期刊论文
源URL	[http://ir.kib.ac.cn/handle/151853/70658]
专题	昆明植物研究所_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.Chinese Acad Sci, Kunming Inst Bot, Germplasm Bank Wild Species, Kunming, Yunnan, Peoples R China 2.Univ Munster, Inst Evolut & Biodivers, Munster, Germany 3.Shandong Normal Univ, Coll Life Sci, Key Lab Plant Stress Res, Jinan, Shandong, Peoples R China
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.