Engineered tuberous carbon sinks

Carbon, rooted.

Groundswell engineers tuberous crops to lock atmospheric carbon into long-lived underground polymers — yielding durable, MRV-grade removal credits and a low-emission biomass for construction.

From harvest to installed material
10–40 t
CO₂e per hectare per year (modeled)
≥ 100 yr
Permanence target (CORC100+)
Off-takes per rotation: credit + biomass
3 yr
From construct to first issued credit
What we do

Tuberize. Lignify. Store, or build.

Two facts the field already accepts: tuberization is a developmental program we can engineer, and lignin is the most recalcitrant carbon pool plants make. Compose them.

01

Tuberize

A tuber-specific promoter (B33 patatin, sporamin) confines our edits to the storage organ — protecting photosynthesis, root vigor, and yield genes.

02

Lignify

Master regulators (MYB46, VND7) activate the secondary cell wall biosynthesis program inside the tuber. AGPase RNAi redirects carbon toward lignin.

03

Store, or build

One hectare yields a verified durable carbon removal credit and a low-embodied-carbon biomass for panels, pellets, or bricks.

Science

Engineering the storage organ to retain carbon.

Every plant fixes carbon. The challenge is retaining it. Engineered tubers route photosynthate into recalcitrant polymers — molecules that resist microbial decay on a centuries-long timescale — and store them inside a discrete, harvestable organ.

Pathway, simplified
PHE L-phenylalanine
PAL · C4H · 4CL Phenylpropanoid loading
CCR · CAD Monolignol synthesis ← MYB46 / VND7
LIGNIN Stored — ≥ 100 yr permanence
01
Capture
Photosynthesis fixes atmospheric CO₂ as photosynthate (sucrose, UDP-glucose).
02
Allocate
Sucrose is loaded onto the phloem and pulled to the storage organ.
03
Engineer
Tuber-specific TF cassette switches on lignin biosynthesis where we want it.
04
Lock
Lignin polymerized in situ. Carbon is locked into polymer, not the soil microbiome.
Outputs

Two off-takes per hectare, in one rotation.

A durable carbon removal credit, and a low-embodied-carbon biomass for construction. Two revenue streams, no additional land.

A — Durable carbon removal

Verifiable removal credits.

The format Frontier ($1B+ AMC), Microsoft (>100 Mt contracted), Google, JPMorgan, and Shopify SCF are paying $200–$500 per tonne to secure — under multi-year offtake.

$6,250/ ha / yr at $250/t × 25 t (modeled)
  • Direct measurementTGA, py-GC/MS, δ¹³C
  • MethodologyPuro.earth (CORC100+) or Verra-aligned
  • Buyer categoryFrontier, Microsoft, Google, JPMorgan
B — Low-emission biomass

Building material from the harvest.

After credit issuance, the harvest is milled into low-embodied-carbon material that substitutes for cement, gypsum, OSB, and petroleum binders.

2× marginstacks on the storage credit
  • Bio-fiber panelvs. OSB / gypsum
  • Lignin pelletvs. petroleum binder
  • Densified brickvs. concrete masonry
Roadmap

Three years to first product.

Each step answers one biological or commercial question; only then do we scale.

Yr 0 — 90 days

Construct + raise.

Synthesize tuber-specific MYB46 cassette. Close pre-seed. File ARPA-E, DOE BER, SBIR I.

Yr 1

First lignified tuber.

Transform potato; phenotype 50+ T₀ events; TGA / py-GC/MS validation; ≥ 2× wild-type lignin.

Yr 2

Field + B. vulgaris.

USDA-APHIS RSR + limited field test. Replicate cassette in Beta vulgaris. MRV protocol drafted.

Yr 3

First product.

First verified CDR credit issued (CORC100+). First biomass offtake. Series A.

Why now

The tools, the buyers, and the regulation have all converged.

~$0.07
Per bp · gene synthesis
A 10 kb tuber-targeted construct is now a sub-$1,000 line item, not a $50,000 program.
>100 Mt
Durable CDR contracted
Frontier, Microsoft, Google, JPMorgan and Shopify pay $200–500/t for verified, durable removals.
SECURE
USDA-APHIS pathway
2020 SECURE rule established Regulatory Status Review — a streamlined pathway for our class of construct.
Team

Founded by plant developmental biologists.

The science we run is the science we trained on. Groundswell is a genetic engineering of the storage organ company — durable carbon credits and a low-emission building biomass from a single rotation.

Kate Harline
Co-founder · CEO

Plant developmental biologist. Entrepreneur and VC technologist. Leads strategy, capital formation, partnerships, and commercial development.

Jack Satterlee
Co-founder · CSO

Plant developmental biologist. Lab co-founder; runs the science — construct design, Agrobacterium-mediated transformation, line characterization, phenotyping protocols.

Get in touch

Carbon, rooted.

If you build durable carbon markets, run a plant biotech lab, write checks for climate science, or operate a non-dilutive program for agricultural biotech — we want to hear from you.

For investors / partners
Pre-seed open.
Raising $2.5M pre-seed alongside $1.5M non-dilutive (ARPA-E, DOE BER, SBIR). 3-year path to first issued CDR credit and first biomass offtake. SAFE, $15M post-money cap. Lead position open.

For scientists / collaborators
Active conversations on tuber-specific promoters, lignin pathway titration, and MRV protocol design. Sponsored research and visiting-scientist arrangements available.

Press / general
kate@groundswell.bio · groundswell.bio