Ancestral light and chloroplast regulation form the foundations for C4 gene expression
Ancestral light and chloroplast regulation form the foundations for C4 gene expression
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DOI：
10.1038/nplants.2016.161
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发表时间：
2016-11-01
期刊：
影响因子：
18
通讯作者：
Hibberd, Julian M.
中科院分区：
文献类型：
--
作者：
Burgess, Steven J.;Granero-Moya, Ignasi;Hibberd, Julian M.
C-4光合作用作为一种碳浓缩机制，导致光合效率的大幅增加。C-4途径存在于60多种植物谱系中（1），但对这种进化的分子推动因素知之甚少。特别是，目前还不清楚祖先C-3系统中的非光合作用蛋白如何反复强烈表达并整合到C-4叶中的光合作用基因调控网络中。在这里，我们提供了明确的证据表明，在C-3叶中，编码C-4途径关键酶的基因已经与光合作用基因共同调节，并受光和叶绿体到核信号的控制。在C-4叶中，这种调节越来越依赖于叶绿体。我们提出，光和叶绿体在祖先的C-3状态的C-4周期基因的调节促进了复杂和收敛的C-4性状的重复进化。
C-4 photosynthesis acts as a carbon concentrating mechanism that leads to large increases in photosynthetic efficiency. The C-4 pathway is found in more than 60 plant lineages(1) but the molecular enablers of this evolution are poorly understood. In particular, it is unclear how non-photosynthetic proteins in the ancestral C-3 system have repeatedly become strongly expressed and integrated into photosynthesis gene regulatory networks in C-4 leaves. Here, we provide clear evidence that in C-3 leaves, genes encoding key enzymes of the C-4 pathway are already co-regulated with photosynthesis genes and are controlled by both light and chloroplast-to-nucleus signalling. In C-4 leaves this regulation becomes increasingly dependent on the chloroplast. We propose that regulation of C-4 cycle genes by light and the chloroplast in the ancestral C-3 state has facilitated the repeated evolution of the complex and convergent C-4 trait.