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Sucrose phosphate synthase (SPS, EC 2.4.1.14) is a key enzyme that regulates sucrose biosynthesis in plants. SPS is encoded by different gene families which display differential expression patterns and functional divergence. Genome-wide identification and expression analyses of  SPS  gene families have been performed in Arabidopsis, rice, and sugarcane, but a comprehensive analysis of the  SPS  gene family in  Litchi chinensis  Sonn. has not yet been reported. In the current study, four  SPS  gene ( LcSPS1 ,  LcSPS2 ,  LcSPS3 , and  LcSPS4 ) were isolated from litchi. The genomic organization analysis indicated the four litchi  SPS  genes have very similar exon-intron structures. Phylogenetic tree showed  LcSPS1 - 4  were grouped into different SPS families ( LcSPS1  and  LcSPS2  in A family,  LcSPS3  in B family, and  LcSPS4  in C family).  LcSPS1  and  LcSPS4  were strongly expressed in the flowers, while  LcSPS3  most expressed in mature leaves. RT-qPCR results showed that  LcSPS  genes expressed differentially during aril development between cultivars with different hexose/sucrose ratios. A higher level of expression of  LcSPS  genes was detected in Wuheli, which accumulates higher sucrose in the aril at mature. The tissue- and developmental stage-specific expression of  LcSPS1 - 4  genes uncovered in this study increase our understanding of the important roles played by these genes in litchi fruits.

Identification and expression profile analysis of the sucrose phosphate synthase gene family inLitchi chinensisSonn.