Hornwort pyrenoids, carbon-concentrating structures, evolved and were lost at least five times during the last 100 million years
Hornwort pyrenoids, carbon-concentrating structures, evolved and were lost at least five times during the last 100 million years
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金鱼藻蛋白核（碳浓缩结构）在过去 1 亿年中至少进化并消失了五次
DOI：
10.1073/pnas.1213498109
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
S. S. Renner
中科院分区：
文献类型：
--
作者：
Villarreal;S. S. Renner
核酮糖-1，5-二磷酸羧化酶加氧酶（RuBisCO）在碳固定中具有关键作用，但催化速率缓慢，这是在一些植物谱系中通过提高酶周围碳浓度的生理和解剖特征克服的问题。据推测，这种碳浓缩机制是在大气CO2含量低的时期演变而来的。角苔是维管植物的姐妹，具有依赖蛋白核的碳浓缩机制，蛋白核是主要由RuBisCO组成的蛋白质体。我们产生了线粒体和质体序列的基础上的36%的约200个金鱼藻物种推断的历史的收益和损失的蛋白核在这个分支的基因组发育;我们还使用化石和多种测年方法来生成的金鱼藻的年表。结果表明，五至六个起源和相同数量的随后损失的蛋白核在金鱼藻，与最古老的蛋白核gainedca。100 Mya，大多数人在<35 Mya。含蛋白核的分支的非同步外观，蛋白核缺乏分支在低[CO2]期间的成功多样化，以及蛋白核在高[CO2]期间的维持都反对先前提出的蛋白核起源和低[CO2]之间的关系。因此，金鱼藻类蛋白核的选择优势和成本必须与大气CO2以外的其他因素有关。
Ribulose-1,5-Biphosphate-carboxylase-oxygenase (RuBisCO) has a crucial role in carbon fixation but a slow catalytic rate, a problem overcome in some plant lineages by physiological and anatomical traits that elevate carbon concentrations around the enzyme. Such carbon-concentrating mechanisms are hypothesized to have evolved during periods of low atmospheric CO2. Hornworts, the sister to vascular plants, have a carbon-concentrating mechanism that relies on pyrenoids, proteinaceous bodies mostly consisting of RuBisCO. We generated a phylogeny based on mitochondrial and plastid sequences for 36% of the approximately 200 hornwort species to infer the history of gains and losses of pyrenoids in this clade; we also used fossils and multiple dating approaches to generate a chronogram for the hornworts. The results imply five to six origins and an equal number of subsequent losses of pyrenoids in hornworts, with the oldest pyrenoid gainedca. 100 Mya, and most others at <35 Mya. The nonsynchronous appearance of pyrenoid-containing clades, the successful diversification of pyrenoid-lacking clades during periods with low [CO2], and the maintenance of pyrenoids during episodes of high [CO2] all argue against the previously proposed relationship between pyrenoid origin and low [CO2]. The selective advantages, and costs, of hornwort pyrenoids thus must relate to additional factors besides atmospheric CO2.
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花角藻类陆生苔藓植物中存在基于核糖核的碳浓缩机制
影响因子：
4.3
作者：
Elizabeth C. Smith;H. Griffiths
通讯作者：
H. Griffiths
C4 光合作用：区分因果关系和巧合
影响因子：
9.2
作者：
E. Roalson
通讯作者：
E. Roalson
DOI：
10.2307/3243365
发表时间：
1994-01
期刊：
The Bryologist
影响因子：
--
作者：
B. Crandall-Stotler;A. Asthana;S. C. Srivastava
通讯作者：
B. Crandall-Stotler;A. Asthana;S. C. Srivastava
影响因子：
3
作者：
Chang, Ying;Graham, Sean W.
通讯作者：
Graham, Sean W.
影响因子：
1.9
作者：
ALBERT, VA;BACKLUND, A;NIXON, KC
通讯作者：
NIXON, KC