Plastid NDH Pseudogenization and Gene Loss in a Recently Derived Lineage from the Largest Hemiparasitic Plant Genus Pedicularis (Orobanchaceae).
Plastid NDH Pseudogenization and Gene Loss in a Recently Derived Lineage from the Largest Hemiparasitic Plant Genus Pedicularis (Orobanchaceae).
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最大的半寄生植物马先蒿属（列当科）最近衍生的谱系中质体 NDH 假发生和基因丢失
DOI：
10.1093/pcp/pcab074
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发表时间：
2021-10-11
影响因子：
4.9
通讯作者：
Yu WB
中科院分区：
文献类型：
--
作者：
Li X;Yang JB;Wang H;Song Y;Corlett RT;Yao X;Li DZ;Yu WB
摘要质体基因组在基因序列和基因内容上都高度保守，突变率低于核基因组。然而，在异养植物中，质体更易变。到目前为止，大多数这样的研究只调查了少数几个物种或只有holoheterotrophic组，很少有研究在最近衍生的谱系从自养到异养的早期过渡阶段的质体进化。在这项研究中，我们调查了在单系和最近派生的马先蒿组质体的进化动态。杯孢（列当科）。我们获得了22个新的质体，其中13个来自Cyathophora组的6个已知种，6个来自半寄生亲属，3个来自自养亲属。基因含量，质体结构和选择压力的比较分析表明，在杯孢组和马先蒿属作为一个整体的物种之间的显着差异。与自养近缘种和其他马先蒿属相比，我们发现杯孢属部分中的反向重复（IR）区域具有向小的单拷贝区域的扩展，具有大的扩展事件和两个独立的收缩事件。此外，NA（D）H脱氢酶、accD和ccsA已经多次丧失功能，其中accD的功能在马先蒿属物种中被accD样基因的核拷贝取代。ccsA和ndhG基因可能在与IR扩张/收缩事件相关的选择下进化。这项研究是第一次报告高质体变异最近衍生的血统半寄生植物，因此提供了证据的质体进化从自养到异养。
Abstract 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.
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具有部分和完全真菌异养物种的兰花部落中质体基因组的谱系特异性减少
影响因子：
3.3
作者：
Feng YL;Wicke S;Li JW;Han Y;Lin CS;Li DZ;Zhou TT;Huang WC;Huang LQ;Jin XH
通讯作者：
Jin XH
影响因子：
3.3
作者：
Chen, Xiaoli;Fang, Dongming;Liu, Huan
通讯作者：
Liu, Huan
影响因子：
10.7
作者：
Barrett, Craig F.;Freudenstein, John V.;Santos, Cristian
通讯作者：
Santos, Cristian
影响因子：
64.8
作者：
Laughlin, Thomas G.;Bayne, Andrew N.;Davies, Karen M.
通讯作者：
Davies, Karen M.
影响因子：
7.2
作者：
Kode, V;Mudd, EA;Day, A
通讯作者：
Day, A