Breeding by Design in Rice: Multi Trait Plant Type Modifications for Sustainable Agriculture

Rice ( Oryza sativa L.) must produce higher grain yields while using fewer resources such as water, nutrients, and pesticides to meet global food demand. We propose a breeding-by-design (BBD) framework comprising three ideotypes: new plant type (NPT), Green Super Rice (GSR), and C 4 -ready rice to deliver step changes in global productivity and sustainability. Deployed at scale, BBD can increase rice yield by 15%‒25% under normal conditions and by 10%‒20% under biotic and abiotic stress conditions, while reducing water and nitrogen fertilizer use by 20%‒30% and shortening breeding cycles by 1‒2 years. NPT focuses on plant architecture and source-to-sink regulation via gene networks: sd1 (plant height), NAL1 (leaf anatomy), IPA1 / OsSPL14 and DEP1 (branching/panicle size), and Gn1a / OsCKX2 (cytokinin sink). GSR enhances stress resilience and input-use efficiency using DRO1 (deep roots), qDTY1.1 / qDTY3.1 (drought and yield), OsNRT1.1B / OsNLP4 (nitrogen use), Pup1 / PSTOL1 (phosphorus uptake), Sub1A-1 (flood), and Saltol / HKT1;5 (salinity). Broad spectrum disease resistance can be achieved by pyramiding blast ( Pi9 / Pigm and Pik ), bacterial blight ( Xa21 , xa5 , xa13 , and SWEET11 / 13 / 14 ), and brown planthopper ( Bph3 / Bph32 and Bph14 ) resistance genes. C 4 -readiness addresses anatomy and biochemistry via NAL1 (vein density/mesophyll layers), OsHXK1 edits (photosynthesis), and photorespiration bypasses as near-term gains toward multi-gene C 4 modules. Across ideotypes, we can integrate multi-omics approaches with marker-assisted selection and genomic selection, haplotype breeding, genome editing, and rapid generation advancement. This toolbox delivers climate-smart, high-yielding rice cultivars with excellent grain quality traits.