Background: Transcriptome sequencing was conducted to screen out genes that actively respond to exogenous 5-aminolevulinic acid (ALA) induction under low temperature stress. The study used two versions of the tomato genome database to strictly screen and identify tomato glutathione S-transferase (GST) gene families and carried out the related bioinformatics analysis of tomato GST gene family. The expression pattern of SlGST genes induced by exogenous application ALA under low temperature stress was also analysed. Related physiological indicators were determined, and related chemical stains were performed.
Results: RNA sequencing (RNA-seq) results showed that the expression of SlGST gene was different under various treatments, and a large number of SlGST genes widely responded to ALA induction under low temperature stress. Sixty-nine full-length GST genes were identified by screening the two versions of tomato genome databases combined with protein domain analysis. Analysis of gene family phylogenetic tree divided the tomato GST gene family into eight subfamilies. Tandem replication of genes is one of the driving forces for the evolution of tomato GST gene family, and a large number of cis-acting elements are related to stress resistance on the promoter of the GST gene family. Exogenous ALA application under low temperature stress induces a broad response of tomato leaf SlGST gene (qRT-PCR verification), increases GST activity and decreases reactive oxygen species (ROS) accumulation.
Conclusions: RNA sequencing results revealed that a large number of tomato GST genes are differentially expressed, and Sixty-nine GSTs are identified in the tomato genome. Tandem replication of genes is the driving force for 68 the evolution of tomato GST family, and the promoter contains a large number of cis-acting elements related to stress resistance. Test results show that exogenous ALA induces the expression of SlGST genes under low temperature stress, thereby increasing GST activity to eliminate the ROS produced under low temperature stress and increase the tomato tolerance.