Abstract
Triacylglycerol Lipases (TGLs) are the major enzymes involved in triacylglycerol catabolism. TGLs hydrolyze long-chain fatty acid triglycerides, which are involved in plant development and abiotic stress responses. Whereas most studies of TGLs have focused on seed oil metabolism and biofuel in plants, limited information is available regarding the genome-wide identification and characterization of the TGL gene family in tomato (Solanum lycopersicum L.). Based on the latest published tomato genome annotation ITAG4.0, 129 SlTGL genes were identified and classified into 5 categories according to their structural characteristics. Most SlTGL genes were distributed on 3 of 12 chromosomes. Segment duplication appeared to be the driving force underlying expansion of the TGL gene family in tomato. The promoter analysis revealed that the promoters of SlTGLs contained many stress responsiveness cis-elements, such as ARE, LTR, MBS, WRE3, and WUN-motifs. Expression of the majority of SlTGL genes was suppressed following exposure to chilling and heat, while it was induced under drought stress, such as SlTGLa9, SlTGLa6, SlTGLa25, SlTGLa26, and SlTGLa13. These results provide valuable insights into the roles of the SlTGL genes family and lay a foundation for further functional studies on the linkage between triacylglycerol catabolism and abiotic stress responses in tomato.
Highlights
The first generation of biodiesel was obtained through lipid research on plants and animals [1]
Given the significance of the function in seed germination, biofuel production, and abiotic stress responses, we focused on the Triacylglycerol Lipases (TGLs) gene family in tomato to study their potential function in response to different abiotic stresses
A phylogenetic tree was constructed based on multiple sequence alignments of all potential TGLs from tomato and the two Arabidopsis
Summary
The first generation of biodiesel was obtained through lipid research on plants and animals [1]. The high-energy-density of triacylglycerol or triacylglyceride (TAG) in plant oils, which is twice as much as carbohydrates, means that they represent a valuable source for biofuels. Plant oils can be transformed into biofuels by transesterification of the acyl and fatty acid (FA) [2]. TAGs, neutral lipids with three fatty acids esterified to a glycerol backbone, are an important compound with the highest density of carbon and energy in eukaryotes. Overexpression of the key limiting enzyme in Arabidopsis TAG synthesis, diacylglycerol acyltransferase 1 (AtDGAT1), has been shown to increase the TAG content in tobacco leaves [8].
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