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Related Concept Videos

Carbon-dioxide Fixation01:28

Carbon-dioxide Fixation

Carbon dioxide fixation in prokaryotes enables the assimilation of inorganic carbon into organic molecules, supporting biosynthetic pathways, sustaining ecosystems, and contributing to the global carbon cycle. It also has industrial applications in carbon capture and bioproduct synthesis. Autotrophic organisms rely on this process to utilize CO₂ as a carbon source in diverse environments.The Calvin CycleThe Calvin cycle is the most widespread carbon fixation mechanism, primarily used by...
C4 Pathway and CAM01:27

C4 Pathway and CAM

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.
C4 Pathway
The C4 pathway is used by plants such as...
The Calvin Benson Cycle01:46

The Calvin Benson Cycle

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...
Inorganic Nitrogen Assimilation01:22

Inorganic Nitrogen Assimilation

Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme nitrate reductase...
Overview of Metabolism01:40

Overview of Metabolism

Living cells constantly carry out various chemical reactions which are necessary for their proper functioning. These reactions are interlinked to one another via multiple pathways. The collection of these chemical reactions is known as metabolism.
Plant Metabolism
Sunlight, the primary source of energy in plants, is first absorbed by the chlorophyll pigments present in their leaves. Plants then use this energy to carry out photosynthesis, where water is oxidized into oxygen and carbon dioxide...
The Calvin Cycle01:40

The Calvin Cycle

OverviewOxygenic photosynthesis plays a central role in the global carbon and oxygen cycles. The carbohydrates produced support nearly all food webs, while the oxygen by‑product enables aerobic life.Light‑dependent and light‑independent reactionsPhotosynthesis occurs in two main stages, each in a different part of the chloroplast: light‑dependent reactions and light‑independent reactions, also called the Calvin‑Benson cycle or simply the Calvin cycle.Light‑dependent reactions take place in the...

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Updated: May 21, 2026

Assessing Structural Traits in Triticum aestivum and Zea mays for C3 and C4 Photosynthetic Differentiation Using Free-hand and Semi-thin Sections
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Assessing Structural Traits in Triticum aestivum and Zea mays for C3 and C4 Photosynthetic Differentiation Using Free-hand and Semi-thin Sections

Published on: July 12, 2024

Improving carbon fixation pathways.

Daniel C Ducat1, Pamela A Silver

  • 1Department of Systems Biology, Harvard Medical School, Boston, MA 02115, United States.

Current Opinion in Chemical Biology
|June 1, 2012
PubMed
Summary
This summary is machine-generated.

Improving crop carbon fixation through photosynthesis research is key for future food and energy needs. Scientists are exploring microbial strategies and synthetic biology to enhance the Calvin cycle and alternative carbon fixation pathways.

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Evaluation of Photosynthetic Efficiency in Photorespiratory Mutants by Chlorophyll Fluorescence Analysis

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Last Updated: May 21, 2026

Assessing Structural Traits in Triticum aestivum and Zea mays for C3 and C4 Photosynthetic Differentiation Using Free-hand and Semi-thin Sections
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Area of Science:

  • Plant Biology
  • Biotechnology
  • Synthetic Biology

Background:

  • Global food and energy demands necessitate enhanced crop carbon fixation efficiencies.
  • Photosynthesis research is being revitalized by molecular strategies from photosynthetic microbes.
  • The Calvin cycle's efficiency in terrestrial crops is a key area for improvement.

Purpose of the Study:

  • To explore novel strategies for enhancing photosynthetic carbon fixation in crops.
  • To investigate the application of synthetic biology for improving photosynthetic efficiency.
  • To examine alternative carbon fixation pathways beyond the Calvin cycle.

Main Methods:

  • Re-examination of photosynthesis in traditional crops using microbial molecular strategies.
  • Application of synthetic biology for compartmentalizing and enhancing photosynthetic reactions.
  • Elucidation of alternative carbon fixation routes distinct from the Calvin cycle.

Main Results:

  • Identification of molecular strategies from microbes to boost Calvin cycle activity.
  • Development of species-independent synthetic biology approaches for photosynthesis.
  • Discovery of alternative pathways for carbon fixation.

Conclusions:

  • Synthetic biology offers innovative methods to enhance crop photosynthesis.
  • Alternative carbon fixation pathways present opportunities for utilizing atmospheric CO2.
  • Improved photosynthesis is crucial for meeting future food and energy demands.