摘要：

Expansins play important roles in root growth and development, but investigation of the expansin gene family has not yet been reported in , and little is known regarding storage root (SR) development. In this work, we identified a total of 37 () in our previously reported SR-forming strain Y22 genome, which included 23 , 4 , 2 and 8 . The phylogenetic relationship, genome localization, subcellular localization, gene and protein structure, promoter -regulating elements, and protein interaction network were systematically analyzed to reveal the possible roles of in the SR development of . The gene expression profiling in Y22 SR development revealed that and were down-regulated, and were up-regulated while were not obviously changed during the critical period of SR expansion, and might be beneficial to SR development. Combining the tissue-specific expression in young SR transverse sections of Y22 and sweetpotato tissue, we deduced that , and might be the key genes for initial SR formation and enlargement, and might be the key gene for root growth and development. This work provides new insights into the functions of the expansin gene family members in , especially for and subfamilies genes in SR development.

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