Engineered photosynthesis and artificial chloroplasts

01Overview and value chain

Markers: [EC: USDA-APHIS SECURE & EU NGT Regulation | OECD: Bioenergy | Regulator: USDA-APHIS (USA), EPA (USA), NEA (China)]

Engineered photosynthesis and artificial chloroplasts rewire the biological process that fixes about 120 gigatonnes of carbon from CO2 each year. Natural photosynthesis converts only about 1-2% of incident sunlight into biomass in most C3 crops, while C4 plants reach roughly 4-6%; the field pushes that ceiling by engineering faster carbon fixation and by building light-driven CO2-fixation systems outside the living cell. Living Carbon’s PagPIP1;2 overexpression raised leaf CO2 conductance, photosynthesis and biomass in poplar (Industrial Crops and Products, 2026); IRRI demonstrated C4 photosynthetic pathway fluxes in transgenic rice (bioRxiv, 2026); the CETCH cycle designed at the Max Planck Institute fixes CO2 through a new-to-nature pathway that outpaces the Calvin-Benson cycle; and a 2026 Chinese Academy of Sciences breakthrough converted CO2 and water to energy under natural sunlight.

The key directions of engineered photosynthesis and artificial chloroplasts are:

1. Enhanced photosynthesis in plants (Enhanced Photosynthesis): overexpressing CO2-conductance and carbon-storage genes to raise biomass and carbon sequestration — Living Carbon’s PagPIP1;2 and bark-storage-protein poplar.
2. C4 photosynthesis engineering (C4 Rice Engineering): installing the more efficient C4 pathway into C3 rice — IRRI’s C4 Rice Project and transgenic C4-flux rice.
3. New-to-nature CO2 fixation (CETCH Cycle): designing synthetic CO2-fixation enzymes and artificial chloroplast organelles that exceed natural rates — Max Planck Institute’s Tobias Erb group and Photosynthesis 2.0.
4. Artificial photosynthesis and bionic leaves (Artificial Photosynthesis): fully synthetic light-driven CO2-reduction and bio-electrochemical hybrids — Forschungszentrum Jülich solar fuels, Harvard’s bionic leaf and the CAS sunlight breakthrough.

Sectoral value chain

[sunlight + CO2] ──> [engineered plant / chloroplast] ──> [fixed carbon]
                                │
                        (enzymatic / electrocatalytic)
                                │
                                ▼
[biofertilizer] <─── [recovered product] <─────┘

Value chain levels

Cross-cutting technologies of the sector:

• Synthetic CO2-fixation cycles (CETCH Cycle): the Max Planck-designed crotonyl-CoA carboxylase pathway fixes CO2 faster than the natural Calvin-Benson cycle in a cell-free artificial chloroplast.
• PV-battery-electrochemical hybrids (PV-EC Solar Fuels): Forschungszentrum Jülich couples photovoltaic, battery buffering and CO2-reduction cells to turn sunlight and CO2 into fuels beyond the limits of photosynthesis.
• Foliar biofertilizer from the bionic leaf (Bionic-Leaf Biofertilizer): Harvard’s nanocoated nitrogen-fixing bacteria, originating in bionic-leaf research, deliver foliar nitrogen to crops (Nature Food, 2026).

02US

The US leads enhanced-photosynthesis trees and the bionic-leaf-to-biofertilizer translation, with field-deployed engineered plants under USDA-APHIS SECURE oversight.

Living Carbon trees, bionic-leaf biofertilizer, USDA-APHIS SECURE

• Living Carbon: PagPIP1;2 overexpression increases leaf CO2 conductance, photosynthesis and biomass accumulation in poplar, with bark-storage-protein co-expression promoting growth — the basis of its carbon-sequestering tree programme in field deployment.
• Harvard Bionic Leaf: the Nocera bionic-leaf lineage now underpins nanocoated nitrogen-fixing bacteria that colonise leaves and supply crop nitrogen — mapped as a “bio-solar nitrogen economy” in a June 2026 Current Research in Biotechnology roadmap and trialled as a foliar biofertilizer (Nature Food, 2026).
• USDA-APHIS SECURE: the revised biotechnology rule governs field deployment of engineered photosynthesis traits in trees and crops, with EPA oversight of environmental outcomes.

03CN

China pursues artificial photosynthesis as a national clean-energy goal, with the Chinese Academy of Sciences reporting a landmark sunlight-driven CO2-to-energy breakthrough.

CAS artificial photosynthesis, sunlight CO2-to-energy, NEA goals

• CAS Institute of Botany: a 2026 breakthrough converted CO2 and water efficiently to energy under natural sunlight, advancing China’s artificial-photosynthesis programme toward a usable solar-fuel device.
• National artificial-photosynthesis programme: CAS and partner institutes coordinate synthetic chloroplast, photocatalyst and bio-hybrid research aligned with the National Energy Administration’s renewable-energy targets.
• NEA clean-energy framing: artificial photosynthesis is positioned within NEA strategy as a frontier route to turn CO2 and sunlight directly into chemical energy.

04EU

Europe anchors the new-to-nature CO2-fixation frontier — the Max Planck synthetic-cycle and artificial-chloroplast science — and PV-driven solar-fuels engineering at Jülich.

Max Planck CETCH, Jülich solar fuels, EU NGT regulation

• Max Planck Institute (Tobias Erb group): the CETCH cycle and synthetic chloroplast organelles fix CO2 through a new-to-nature pathway that outpaces the Calvin-Benson cycle; the group frames the agenda as “Photosynthesis 2.0” for redesigning the global carbon cycle.
• Forschungszentrum Jülich: hybrid photovoltaic-battery-electrochemical systems drive PV-based CO2 reduction into solar fuels, pushing beyond the limits of natural photosynthesis using solid-oxide and electrocatalytic stacks.
• EU NGT regulation: the new genomic-techniques framework shapes how engineered-photosynthesis crops move toward the field, complementing standard synthetic-biology oversight.

05Leading companies and research institutes

06Tech stack and innovations

The stack spans engineered genes in living plants, synthetic enzymes in cell-free organelles, and fully abiotic light-driven CO2 reduction.

1. Enhanced-photosynthesis genes (Enhanced Photosynthesis):
   • PagPIP1;2 overexpression raises leaf CO2 conductance and biomass in poplar, while bark-storage-protein co-expression promotes growth and redirects carbon — Living Carbon’s basis for field-deployed carbon-sequestering trees.
   • IRRI’s C4 Rice Project engineers C4 photosynthetic pathway fluxes into transgenic rice, aiming to lift the crop from about 1-2% toward the 4-6% efficiency of natural C4 plants.
2. Synthetic CO2-fixation cycles (CETCH Cycle):
   • the Max Planck-designed CETCH cycle uses crotonyl-CoA carboxylase and a new-to-nature enzyme network to fix CO2 faster than the Calvin-Benson cycle, hosted in cell-free artificial chloroplast organelles.
   • the agenda is framed as “Photosynthesis 2.0” — redesigning the carbon cycle with synthetic biology beyond evolution’s constraints.
3. Artificial photosynthesis and bionic leaves (Artificial Photosynthesis):
   • Forschungszentrum Jülich’s hybrid PV-battery-electrochemical systems drive CO2 reduction into solar fuels, while a 2026 CAS Institute of Botany breakthrough converted CO2 and water to energy under natural sunlight.
   • Harvard’s bionic-leaf lineage translates into nanocoated nitrogen-fixing bacteria that deliver foliar nitrogen to crops — a bio-solar nitrogen economy (Nature Food, 2026).

07Value chains and production pipelines

Industrial pipeline of an engineered-photosynthesis / artificial-chloroplast platform (USDA-APHIS SECURE, EU NGT)

┌───────────────────────────┐      ┌───────────────────────────┐
│ 1. Light & CO2 capture    │ ───> │ 2. Engineered fixation    │
└───────────────────────────┘      └───────────────────────────┘
                                                  │
                                                  ▼
┌───────────────────────────┐      ┌───────────────────────────┐
│ 4. Product recovery       │ <─── │ 3. Bio-conversion         │
└───────────────────────────┘      └───────────────────────────┘
              │
              ▼
┌───────────────────────────┐      ┌───────────────────────────┐
│ 5. Formulation            │ ───> │ 6. Field & off-take       │
└───────────────────────────┘      └───────────────────────────┘

Stage 1: Light and CO2 capture

Photons are harvested by chloroplasts in engineered plants, by cell-free photosynthetic membranes in artificial chloroplasts, or by photovoltaic cells in PV-EC hybrids; CO2 enters via stomata or is fed as a gas, supplying the carbon and energy for fixation.

Stage 2: Engineered fixation

In Living Carbon’s poplar, PagPIP1;2 raises leaf CO2 conductance to Rubisco; IRRI’s transgenic rice routes carbon through engineered C4 enzymes; the Max Planck CETCH cycle and CAS/Jülich electrocatalysts fix CO2 through new-to-nature routes at rates targeting or exceeding natural photosynthesis.

Stage 3: Bio-conversion

Fixed carbon is converted into biomass, sugars, fuels or biofertilizer — poplar wood and bark storage protein, C4 rice grain, CETCH-cycle products, Jülich solar fuels, or Harvard’s nanocoated nitrogen-fixing bacteria for foliar delivery.

Stage 4: Product recovery

Biomass is harvested as trees or grain; cell-free and electrocatalytic products are separated from the reaction broth; nanocoated bacteria are recovered and stabilised for formulation.

Stage 5: Formulation

Products are dried, coated or compounded — engineered seedlings for planting, biofertilizer coatings for foliar spray, or purified solar-fuel streams for downstream use.

Stage 6: Field and off-take

Engineered trees are planted under USDA-APHIS SECURE for carbon removal, C4 rice and foliar biofertilizer are applied for yield gain in South Asia, and solar fuels and CETCH products are routed to energy and chemical off-takers.