PR-1 — Solanum lycopersicum

Summary

SlPR-1 (SOLYC09G005950.3) on tomato chromosome 9 encodes a protein containing a CAP domain and a CRISP-related region, placing it in the pathogenesis-related PR-1 family. The gene is associated with a wide range of biological processes including viral life cycle, immune evasion, interaction with host, hyphal growth, biofilm formation, and responses to water and host stimuli. It has also been linked to proline, flavonoid, chlorophyll, and sterol metabolism, as well as fermentation, cell communication, and sexual reproduction. The encoded protein localises to the extracellular region and vacuole. SlPR-1 is associated with numerous agronomic traits including fruit firmness, fruit shape and size, plant height, stem width, seedling vigor, leaf chlorosis, leaf number, chlorophyll content, stomatal resistance, drought tolerance, abscisic acid sensitivity, and flavonoid content. Studies of related genes in other species link the PR-1 family to fruit weight, fruit length, seed viability, root traits, and heterosis.