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Sucrose phosphate synthase ( SPS ), a key rate-limiting enzyme in the sucrose biosynthesis pathway in plants, is encoded by a multi-gene family. Until recently, the identification and characterization of the  SPS  gene family have been performed for dozens of plant species; however, few studies have involved a comprehensive analysis of the  SPS  family members in tropical crops, such as cassava ( Manihot esculenta  Crantz). In the current study, five  SPS  genes ( MeSPS1 ,  MeSPS2, MeSPS3 ,  MeSPS4,  and  MeSPS5 ) were isolated from cassava, and their sequence characteristics were comprehensively characterized. These  MeSPS  genes were found distributed on five chromosomes (Chr2, Chr14, Chr15, Chr16, and Chr18). Phylogenetic analysis showed that the  MeSPS  protein sequences were clustered into three families, together with other  SPS  sequences from both dicot and monocot species (families A, B, and C). The spatio-temporal expression pattern analysis of  MeSPS  genes showed a tissue-specific and partially overlapping expression pattern, with the genes mainly expressed in source tissues during cassava growth and development. Correlation analysis revealed that the expression of  MeSPS  genes correlated positively with root starch content, indicating that the expression of  MeSPS  genes might accelerate the rate of starch accumulation in the roots of cassava plants.

Molecular cloning and expression analysis of sucrose phosphate synthase genes in cassava (Manihot esculenta Crantz)