Genotypic and multi-environment phenotypic evaluation of the lima bean USDA National Plant Germplasm System collection
Adaskaveg, J. A.; Hershberger, J.; Farmer, A. A.; Penmetsa, R. V.; Garcia-Lopez, I.; Garcia-Abadillo, J.; Zhou, X.; Huynh, B.-L.; Roberts, P.; Ernest, E. G.; Warburton, M. L.; Jarquin, D.; Dohle, S.; Palkovic, A.; Parker, T. A.; Gepts, P.; Diepenbrock, C. H.
Crop Improvement
Lima beans you grow from heirloom seed are drawing on genetic diversity shaped by two entirely separate domestication events thousands of miles apart — and this study just mapped that diversity so breeders can finally put it to work.
Scientists took the US government's entire stored collection of lima bean varieties and ran them through genetic sequencing and real farm trials in different climates. They found which plants grow best in cool versus hot conditions, how genes control things like when plants flower or how much protein the seeds pack, and they identified the most genetically diverse subset worth preserving. The result is essentially a detailed guidebook that plant breeders can use to breed better lima beans — ones more adapted to drought, heat, or nutritional goals.
Key Findings
810 lima bean accessions were genotyped via low-coverage sequencing, revealing that geographic origin and domestication history (Andean large-seeded vs. Mesoamerican small/medium-seeded) are the primary drivers of genetic population structure.
Field trials across 3 sites in CA and WA over 2 years measured agronomic traits (flowering time, determinacy) and seed traits (protein, starch, fat, seed weight via near-infrared spectroscopy), with genomic prediction accuracy rated moderate to high for key traits.
A core collection of 211 extensively phenotyped accessions plus 91 supplemental accessions was established to maximize genetic diversity for use in future breeding programs.
chevron_right Technical Summary
Researchers catalogued the full US government collection of lima bean varieties — genotyping 810 accessions and field-testing hundreds across California and Washington — to give breeders a detailed map of which plants perform best where and what genes drive key traits like protein content, flowering time, and seed size.
Abstract Preview
Lima bean (Phaseolus lunatus L.) is an economically and agronomically important grain legume. Lima beans (or limas) show a range of climatic adaptations with independent domestications in the Andes...
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A lima bean, also commonly known as butter bean, sieva bean, double bean or Madagascar bean, is a legume grown for its edible seeds or beans.