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| Screening of Heat Tolerance Genes in Tomato (Solanum lycopersicum) Based on BSA-seq and Plant Hormone Combined Analysis |
| JIANG Yue-Chang1, DUAN Jin-Hu1, LI Yi-Feng1, MAO Xiu-Jie1,2,3,4,*, WANG Shuai1,2,4,*, ZHANG Ning1,2 |
1 College of Horticulture Science and Technology, Hebei Normal University of Science and Technology, Qinhuangdao 066004, China;
2 Key Laboratory of Specialty Horticulture Germplasm Mining and Innovative Utilization of Hebei Province, Qinhuangdao 066004, China;
3 Yanshan Agricultural Characteristic Industry Technology Research Institute of Hebei Province, Qinhuangdao 066004, China;
4 Hebei Higher Institute Application Technology Research and Development Center of Horticultural Plant Biological Breeding, Hebei Normal University of Science & Technology, Qinhuangdao 066004, China |
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Abstract High temperatures affect the physiology and hormone metabolism of tomatoes (Solanum lycopersicum). Localization of genes involved in heat tolerance in tomato can provide theoretical and technical support for subsequent gene cloning and functional analysis. In this study, electrical conductivity was used as the identification index, and 2 tomato strains at seedling stage were identified by high temperature and heat resistance, and the F2 generation isolated population formed by heat-resistant strain CH and heat-sensitive strain DH and their F1 generation were used as materials to detect plant hormones in parents CH and DH. The F2 generation isolated population was resequenced by bulked sergeant analysis (BSA), and candidate genes related to tomato heat resistance were screened through the combined analysis. The results showed that 4 metabolic pathways related to abiotic stress were obtained by phytohormone differential metabolite screening and KEGG annotation, namely glycine, serine and threonine metabolic pathways, amino acid biosynthetic pathway, tryptophan metabolic pathway and aminoacyl-tRNA biosynthetic pathway; 6.32 Mb size candidate interval was obtained on chromosome 3 by BSA-seq sequencing. which included 752 candidate genes. Combined with the differential metabolic pathways, 5 candidate genes associated with heat tolerance in tomato were finally screened within the candidate regional metabolic pathways, namely: D-glycerate 3-kinase (DG3K), Hydroxypyruvate reductase (HYDR), prolyl-tRNA synthetase (PARS2) and ribulose phosphate 3-epimerase (RPE), aldehyde dehydrogenase (ALDH). The expression of the candidate genes was analysed by qPCR, the expression of candidate genes DG3K, PARS2, and RPE increased extremely significant after 3 hours of high temperature stress (P<0.01), it was hypothesized that these 3 candidate genes might play an important role in the regulation of heat tolerance in tomato. This study has important implications for molecular assisted selection of heat-resistant tomato lines.
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Received: 02 March 2023
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Corresponding Authors:
*maoxiujie@126.com; wangshuai101og@126.com
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