HSF1 — Solanum lycopersicum

Summary

SlHSF1 (SOLYC08G005170.3) on tomato chromosome 8 encodes a heat shock transcription factor containing a conserved HSF DNA-binding domain and is annotated with sphingosine kinase activity, DNA-binding transcription factor binding, and numerous other molecular functions including kinase activity, ubiquitin ligase binding, and promoter-specific chromatin binding. In tomato, SlHSF1 is directly associated with heat tolerance. The gene is linked to a wide array of biological processes including autophagy in response to ER stress, regulation of sleep, pinene breakdown, phytosphingosine metabolism, pectin metabolism, glutamate metabolism, melatonin anabolism, and flower formation. It is associated with traits such as inflorescence number, cytoplasmic male sterility, seed yield, net photosynthetic rate, water use efficiency, germination rate, stomatal resistance, and responses to high and low temperature stress. The protein localises to stress granules, the nucleolus, the apoplast, and the plant-type cell wall, among other compartments.