Mitochondrial DNA suggests at least 11 origins of parasitism in angiosperms and reveals genomic chimerism in parasitic plants.
Mitochondrial DNA suggests at least 11 origins of parasitism in angiosperms and reveals genomic chimerism in parasitic plants.
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DOI：
10.1186/1471-2148-7-248
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发表时间：
2007-12-21
影响因子：
3.4
通讯作者：
Depamphilis CW
中科院分区：
文献类型：
--
作者：
Barkman TJ;McNeal JR;Lim SH;Coat G;Croom HB;Young ND;Depamphilis CW
在进化生物学中，一些最困难的系统发育问题涉及到寄生生物，特别是寄生开花植物的自由生活的近亲的鉴定。因此，寄生起源的数量和异养生活方式在被子植物谱系中的系统发育分布尚不清楚。在这里，我们报告了102种种子植物的系统发育分析结果，旨在利用三个线粒体基因：atp1， coxI和matR来推断所有吸器寄生被子植物谱系的位置。总的来说，mtDNA系统发育与独立的非寄生植物关系研究一致，并揭示了被子植物中至少有11个独立的寄生起源，其中8个完全由缺乏光合能力的全寄生物种组成。从这些结果可以推断出，现代寄生虫在某些谱系中进化得不成比例，而内寄生习性是由四个进化支系的融合而产生的。此外，通过减少分类群，单基因分析揭示了atp1从宿主到寄生虫谱系的多次水平转移，表明寄生虫可能是被子植物中水平基因转移的重要载体。此外，在pilot styles中，我们展示了最近基于嵌合基因序列的宿主到寄生虫的atp1转移的证据，这表明在这种内寄生虫中发生了多个历史上的异种基因获得。最后，对寄生虫的系统发育关系的推断表明，被子植物的寄生起源与侵入性coxI I组内含子的水平获取密切相关。总之，这些结果表明，寄生生活方式在被子植物的进化史上反复出现，并随着时间的推移导致寄生虫基因组嵌合现象的增加。
Some of the most difficult phylogenetic questions in evolutionary biology involve identification of the free-living relatives of parasitic organisms, particularly those of parasitic flowering plants. Consequently, the number of origins of parasitism and the phylogenetic distribution of the heterotrophic lifestyle among angiosperm lineages is unclear. Here we report the results of a phylogenetic analysis of 102 species of seed plants designed to infer the position of all haustorial parasitic angiosperm lineages using three mitochondrial genes: atp1, coxI, and matR. Overall, the mtDNA phylogeny agrees with independent studies in terms of non-parasitic plant relationships and reveals at least 11 independent origins of parasitism in angiosperms, eight of which consist entirely of holoparasitic species that lack photosynthetic ability. From these results, it can be inferred that modern-day parasites have disproportionately evolved in certain lineages and that the endoparasitic habit has arisen by convergence in four clades. In addition, reduced taxon, single gene analyses revealed multiple horizontal transfers of atp1 from host to parasite lineage, suggesting that parasites may be important vectors of horizontal gene transfer in angiosperms. Furthermore, in Pilostyles we show evidence for a recent host-to-parasite atp1 transfer based on a chimeric gene sequence that indicates multiple historical xenologous gene acquisitions have occurred in this endoparasite. Finally, the phylogenetic relationships inferred for parasites indicate that the origins of parasitism in angiosperms are strongly correlated with horizontal acquisitions of the invasive coxI group I intron. Collectively, these results indicate that the parasitic lifestyle has arisen repeatedly in angiosperm evolutionary history and results in increasing parasite genomic chimerism over time.
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影响因子：
56.9
作者：
Davis, CC;Wurdack, KJ
通讯作者：
Wurdack, KJ
DOI：
10.1073/pnas.94.14.7367
发表时间：
1997-07-08
影响因子：
11.1
作者：
dePamphilis, CW;Young, ND;Wolfe, AD
通讯作者：
Wolfe, AD
影响因子：
1.9
作者：
CHASE, MW;SOLTIS, DE;ALBERT, VA
通讯作者：
ALBERT, VA
DOI：
10.2307/2412923
发表时间：
1978-01-01
期刊：
SYSTEMATIC ZOOLOGY
影响因子：
--
作者：
FELSENSTEIN, J
通讯作者：
FELSENSTEIN, J
影响因子：
64.8
作者：
DEPAMPHILIS, CW;PALMER, JD
通讯作者：
PALMER, JD