A jasmonate-responsive ERF transcription factor regulates steroidal glycoalkaloid biosynthesis genes in eggplant

Abstract

AbstractSteroidal glycoalkaloids (SGAs) are a class of cholesterol-derived anti-nutritional defense compounds that are produced in species of the genusSolanum, such as tomato (S. lycopersicum), potato (S. tuberosum), and eggplant (S. melongena). However, the regulation of defense-related metabolites in eggplant remains underexplored. In tomato and potato, the JASMONATE-RESPONSIVE ETHYLENE RESPONSE FACTOR 4 (JRE4) transcription factor positively regulates a large number of genes involved in SGA biosynthesis. Here, we report that overexpression of eggplantJRE4(SmJRE4) induces numerous metabolic genes involved in SGA biosynthesis in leaves. We demonstrate jasmonate-dependent induction ofSmJRE4and its downstream metabolic genes and show that ethylene treatment attenuates this induction. Our findings thus provide molecular insights into SGA biosynthesis and its regulation in this major crop.