Evolution of the C4 photosynthetic mechanism: are there really three C4 acid decarboxylation types?
Evolution of the C4 photosynthetic mechanism: are there really three C4 acid decarboxylation types?
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DOI：
10.1093/jxb/err080
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发表时间：
2011-05-01
影响因子：
6.9
通讯作者：
Furbank, Robert T.
中科院分区：
文献类型：
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作者：
Furbank, Robert T.
地球上一些最高产的植物使用一种被称为C-4途径的光合作用变体。这种光合作用机制使用生物化学泵将CO2浓缩到C-3光合作用的主要酶Rubisco所在的叶的专门细胞中的10倍大气水平。40多年前发现的这一过程的基本生化途径已被广泛研究，基于这些途径，C-4植物根据叶肉细胞中产生的C-4酸的种类被细分为两大类，根据用于使维管束鞘中的C-4酸脱羧以释放CO2的酶被细分为三大类。最近的分子，生物化学和生理学数据表明，这三种脱羧类型可能不会严格遗传决定，存在的途径之间的灵活性的可能性，这可能是潜在的发展和环境控制。这一证据在这里合成和C-4工程的影响进行了讨论。
Some of the most productive plants on the planet use a variant of photosynthesis known as the C-4 pathway. This photosynthetic mechanism uses a biochemical pump to concentrate CO2 to levels up to 10-fold atmospheric in specialized cells of the leaf where Rubisco, the primary enzyme of C-3 photosynthesis, is located. The basic biochemical pathways underlying this process, discovered more than 40 years ago, have been extensively studied and, based on these pathways, C-4 plants have been subdivided into two broad groups according to the species of C-4 acid produced in the mesophyll cells and into three groups according to the enzyme used to decarboxylate C-4 acids in the bundle sheath to release CO2. Recent molecular, biochemical, and physiological data indicate that these three decarboxylation types may not be rigidly genetically determined, that the possibility of flexibility between the pathways exists and that this may potentially be both developmentally and environmentally controlled. This evidence is synthesized here and the implications for C-4 engineering discussed.