Crop biotech
Breeding still runs on prediction over polygenic traits, editing breaks genes better than it builds yield, and every trait names a trade-off the plant keeps paying.
Fourteen subjects that look like a list of separate techniques — speed breeding, grafting, nitrogen fixation, ornamentals — but keep returning to the same three statements.
Almost everything a variety is bought for is polygenic. That is why the workhorse of this cluster is prediction: the most powerful breeding tool ranks plants by genes it never identifies, and editing, excellent at breaking a single gene, is poor at building yield. The limiting step has moved to the field. Sequencing became cheap and measuring plants did not, so the bottleneck sits in phenotyping and in the generations per year that extended daylength buys — generations, not better decisions about which plants to keep. Every trait is a trade-off stated as arithmetic. A perennial cannot put everything into seed; drought tolerance usually costs yield when the rain arrives; nitrogenase is destroyed by the oxygen a leaf cannot stop making.
Start with genetic engineering and breeding: it sets out the polygenic logic that the other pages either exploit or collide with. The method pages — phenomics, speed breeding, CRISPR — follow from it; nitrogen fixation and perennial grains are the hard unsolved cases.
Articles 14
| Allelopathic crops Plants that poison their neighbours — real chemistry, and why the soil decides how much of it matters. |
| Biofortification of crops Raising the concentration of a nutrient in a grain is the easy half. Getting it absorbed is the other one. |
| Climate-resilient crops "Drought tolerance" names an outcome, not a mechanism — and the mechanisms that produce it usually cost yield when the rain arrives. |
| Genetic design of ornamental and landscape plants Ornamentals are where plant engineering is easiest to sell and hardest to hide: the trait is the product, and the customer looks at it. |
| Genetic engineering and breeding Almost everything a farmer buys a variety for is polygenic — which is why the most powerful tool in breeding predicts genes it never identifies. |
| Vegetable grafting platforms Two plants joined at the stem give a root system with resistance and a fruit that is genetically untouched. |
| Closed-loop food systems for Mars A crew's food is an accounting problem in mass, power and nitrogen before it is a farming problem. |
| Nitrogen-fixing cereals The hardest unsolved problem in this cluster: an enzyme that oxygen destroys, in a plant that cannot stop making oxygen. |
| Nitrogen-fixing microbial inoculants Rhizobial inoculants work because the symbiosis already exists — the product supplies a partner, not a capability. |
| Perennial grains A plant that intends to live through winter cannot put everything into seed — which is the whole problem, stated as arithmetic. |
| Phenomics and high-throughput phenotyping Sequencing got cheap and measuring plants did not, so the limit on breeding moved to the field. |
| Precision plant breeding with CRISPR Editing is excellent at breaking a gene and poor at building a yield — and in most species the real obstacle is still getting the edit into a plant that will regrow. |
| Speed breeding and seed services Extended daylength buys generations per year. It does not buy better decisions about which plants to keep. |
| Biofortification: nutrition bred into the seed, deployed as a program Biofortification puts the nutrient in the grain itself — no fortification plant after the harvest — which moves the engineering into breeding institutes and the economics into variety registration and seed systems; the discipline is a relay from germplasm screening to population-scale intake. |