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C4 Pathway and CAM01:27

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Most plants use the C3 pathway for carbon fixation. However, some plants, such as sugar cane, corn, and cacti that grow in hot conditions, use alternative pathways to fix carbon and conserve energy loss due to photorespiration. Photorespiration is the process that occurs when the oxygen concentration is high. Under such conditions, the rubisco enzyme in the Calvin cycle binds O2 instead of CO2, which halts photosynthesis and consumes energy.
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Ribulose 1,5- bisphosphate carboxylase/oxygenase (RuBisCo) is a critical enzyme that catalyzes carbon dioxide assimilation during photosynthesis. However, it is an inefficient enzyme, having an extremely slow catalytic rate. A typical enzyme can process about a thousand molecules per second; however, RuBisCo fixes only around three-carbon dioxides per second. Photosynthetic cells compensate for this slow rate by synthesizing very high amounts of RuBisCo, making it the most abundant single...
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Green algae and plants, including green stems and unripe fruit, harbor specialized organelles called chloroplasts to carry out photosynthesis. They coordinate both stages of photosynthesis — the light-dependent reactions and the light-independent reactions. The light-dependent reactions use sunlight to release oxygen and produce chemical energy in the form of ATP and NADPH, and the light-independent reactions capture CO2 and use ATP and NADPH to produce sugar.
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The light reactions of photosynthesis assume a linear flow of electrons from water to NADP+. During this process, light energy drives the splitting of water molecules to produce oxygen. However, oxidation of water molecules is a thermodynamically unfavorable reaction and requires a strong oxidizing agent. This is accomplished by the first product of light reactions: oxidized P680 (or P680+), the most powerful oxidizing agent known in biology. The oxidized P680 that acquires an electron from the...
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Author Spotlight: Innovative Approaches to Understanding Plant Structure-Function Relationships for Climate-Resilient Crops
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解读C4光合作用进化的演变.

Syed Adeel Zafar1, Julia Bailey-Serres1

  • 1Center for Plant Cell Biology, Department of Botany and Plant Sciences, University of California, Riverside, CA, USA.

Trends in plant science
|March 4, 2025
PubMed
概括
此摘要是机器生成的。

对于玉米等作物来说至关重要的C4光合作用过程的进化是通过重新利用现有的基因调节元件来推动的. 这种古老的监管代码促进了C3祖先的C4路径的发展.

关键词:
C3光合作用过程中的光合作用.C4 演变的演变在 DOF 绑定图案中使用 DOF 绑定图案.这里有cis元素.

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科学领域:

  • 植物生物学 植物生物学
  • 进化生物学是进化的生物学.
  • 生物化学 生化学

背景情况:

  • C4光合作用显著提高了玉米和等植物的作物生产率.
  • 来自C3祖先的C4路径的进化起源在很大程度上是未知的.
  • 了解这种转变是提高作物产量和农业可持续性的关键.

研究的目的:

  • 研究C4光合作用进化的基础分子机制.
  • 确定使C4通路成为可能的遗传和监管变化.
  • 阐明C3工厂如何过渡到更高效的C4系统.

主要方法:

  • 对C3和C4植物物种进行比较基因组学分析.
  • ChIP测序用于识别cis调节元素和转录因子结合位.
  • 报告者基因测试测试cis调节元件的功能.
  • 分析不同叶子组织中的基因表达模式.

主要成果:

  • 斯威夫特等人. 斯威夫特等人. 发现了一种保存的cis-regulatory代码,该代码先前参与了C3基因表达.
  • 这种先前存在的代码被采用并修改,以调节C4植物捆束细胞中的基因.
  • 这项研究表明,现有的遗传架构是如何被重新用于复杂代谢途径的进化.

结论:

  • C4光合作用的进化并不是由新的调节元件的发明驱动的,而是由现有的调节元件的招募.
  • 预先存在的cis-regulatory代码用于捆束基因表达,对于使C4光合作用成为可能至关重要.
  • 这一发现为植物主要进化创新的遗传基础提供了关键的见解.