title: Genome-wide identification, phylogeny, and expression analysis of the SWEET gene family in tomato.
abstract: The SWEET (Sugars Will Eventually Be Exported Transporters) gene family encodes membrane-embedded sugar transporters containing seven transmembrane helices harboring two MtN3 and saliva domain. SWEETs play important roles in diverse biological processes, including plant growth, development, and response to environmental stimuli. Here, we conducted an exhaustive search of the tomato genome, leading to the identification of 29 SWEET genes. We analyzed the structures, conserved domains, and phylogenetic relationships of these protein-coding genes in detail. We also analyzed the transcript levels of SWEET genes in various tissues, organs, and developmental stages to obtain information about their functions. Furthermore, we investigated the expression patterns of the SWEET genes in response to exogenous sugar and adverse environmental stress (high and low temperatures). Some family members exhibited tissue-specific expression, whereas others were more ubiquitously expressed. Numerous stress-responsive candidate genes were obtained. The results of this study provide insights into the characteristics of the SWEET genes in tomato and may serve as a basis for further functional studies of such genes.
authors.affiliation: The Key Laboratory of Protected Horticulture, Ministry of Education, College of Horticulture, Shenyang Agricultural University, No.120 Dongling Road, Shenyang 110866, PR China.
authors.forename: Chao-Yang
authors.initials: CY
authors.lastname: Feng
authors.affiliation: The Key Laboratory of Protected Horticulture, Ministry of Education, College of Horticulture, Shenyang Agricultural University, No.120 Dongling Road, Shenyang 110866, PR China.
authors.forename: Jia-Xuan
authors.initials: JX
authors.lastname: Han
authors.affiliation: The Key Laboratory of Protected Horticulture, Ministry of Education, College of Horticulture, Shenyang Agricultural University, No.120 Dongling Road, Shenyang 110866, PR China.
authors.forename: Xiao-Xue
authors.initials: XX
authors.lastname: Han
authors.affiliation: The Key Laboratory of Protected Horticulture, Ministry of Education, College of Horticulture, Shenyang Agricultural University, No.120 Dongling Road, Shenyang 110866, PR China. Electronic address: jj_syau@hotmail.com.
authors.forename: Jing
authors.initials: J
authors.lastname: Jiang
mesh_terms: D000222:Adaptation, Physiological; D015870:Gene Expression; D017343:Genes, Plant; D018551:Solanum lycopersicum / Q000235:genetics* / Q000378:metabolism; D010802:Phylogeny; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism; D013312:Stress, Physiological
chemical_list: D010940:Plant Proteins
keywords: Gene expression; Gene family; Phylogeny; SWEETs; Sugar transporter; Tomato