DOI: 10.3724/SP.J.1006.2018.00197

Acta Agronomica Sinica (作物学报) 2018/44:2 PP.197-207

Genome-wide Analysis and Expression Profiling of SPS Gene Family in Brassica nupus L.

Sucrose phosphate synthase (SPS) is the rate-limiting enzyme that controls the sucrose biosynthesis in plants and has great influence on transportation and accumulation of photosynthate. In this study, we identified 11 members of the SPS gene family in the oilseed rape (Brassica nupus L.) genome. These SPS genes were classed into clusters A, B, and C according to gene structure and phylogenetic relationship. Gene structure prediction indicated that BnSPS genes were highly conserved, in which BnSPSC-1 consisted five exons and others consisted 11-15 exons. Promoter cis-element analysis indicated that BnSPS genes had not only essential responsive elements but also some types of elements potentially responsive to stresses or hormone responses. The qRT-PCR assay showed tissue-specific expressions of BnSPS genes with rich expressions of BnSPSA1 in flower, BnSPSB in leaf, bud and flower, BnSPSC in leaf, and BnSPSA2 in various tissues. The relative expression levels of BnSPSA1 and BnSPSC were higher in high-biomass rapeseed varieties than in low-biomass rapeseed varieties, whereas, that of BnSPSB was higher in low-biomass rapeseed varieties, suggesting that SPS genes are closely ralated to biological yield of rapeseed. This study provides basic information for functional study and utilization of BnSPS genes.

Key words:Brassica napus,sucrose phosphate synthase,genome-wide analysis,expression analysis

ReleaseDate:2018-03-08 10:17:42

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