Can tomatoes be spicy?
The capsaicin pathway can be engineered into tomato. Tomato is Capsicum's closest major-crop relative; it already carries most of the upstream biochemistry. That makes it the easiest Beyond Peppers host and the first commercial target in the catalog.
Why tomato first
Tomato (Solanum lycopersicum) and chili pepper ( Capsicum spp.) belong to the same family, Solanaceae. Their genomes share deep synteny: large stretches of chromosome where gene order is conserved. The vanillin-arm precursors of the capsaicinoid pathway — vanillin and phenylpropanoid intermediates — are already present in tomato fruit, produced for flavor and defense. What tomato lacks is the final condensation step: no Pun1, no pAMT, and no fatty-acid branch feeding the acyl-CoA pool.
In practice, this means that a well-designed cassette of three to five genes can reconstitute the capsaicinoid pathway in tomato without touching the host's native metabolism. It is the easiest Beyond Peppers project we work on.
What the construct looks like
A typical Scoville Splice tomato product carries pAMT, Pun1, a branched-chain acyl-CoA supply pair (KAS/BCAT), and a fruit-specific promoter (an ethylene-responsive promoter from the ripening regulon) driving the whole module. The construct is codon-optimized for Solanum, assembled with Agrobacterium T-DNA borders, and ships as a sequence-complete FASTA.
What SHU can tomato reach?
Our flux-balance ceiling for tomato fruit sits near 150,000 SHU, limited by precursor supply during the twenty-day ripening window. Commercial Beyond Peppers tomato cultivars target 500–50,000 SHU — the band where tomato biology comfortably supplies the pathway and where food applications can actually use the result.
Tier 1 Spark cultivars (Spicy Zebra, Pyroclast, Ember-Toy) sit at 2,500–8,000 SHU, roughly serrano-equivalent. Tier 2 Flare cultivars push into 20,000–50,000 SHU, roughly cayenne to Thai. We do not currently ship a superhot tomato — the biology is interesting but the market is small.
Taste engineering
The win is not just heat. Tomato brings its own umami, sweetness, and acid; a spicy tomato tastes genuinely new. We tune the five-capsaicinoid ratio and the fruit-ripening timing to pair with the host's native sugar and glutamate profile. The result is closer in character to a fresh salsa than to a hot sauce.
Who it is for
CPG partners developing shelf-stable salsa, pizza sauce, and shakshuka bases are the lead customers. Specialty growers can also license Specimen cultivars for farmers-market and restaurant-direct sales. See the tomato organism hub for the current product line, or read Capsicum vs Beyond Peppers for how tomato fits into the four-tier difficulty gradient.