Salt stress shifts wild tomato root systems toward transport efficiency along a gravitropism-constrained Pareto front

Salt stress in wild tomato (Solanum pimpinellifolium) shifts root systems toward conduction-delay minimization, with lateral roots growing 10° closer to vertical while the main-root angle stays unchanged.

• Why it matters: Root architecture must balance carbon wiring costs against transport speed, but prior Pareto models assumed straight lateral roots, misrepresenting curved forms under salinity.
• What they did: The authors extended a Pareto model to include lateral-root curvature, estimating curvature parameter G and trade-off weight from 1,597 root systems across 240 accessions grown with or without 100mM NaCl, plus root-angle measurements and a GWAS.
• The result: Curvature improved model fit in 80% of root systems, salt shifted architectures toward lower conduction delay across four types, and a chromosome 6 intronic locus near an ISOAMYLASE 3 ortholog explained ~11% of variation and was more heritable under salt.

AI summary of the abstract · may contain errors · not medical advice · read the paper.