Genome-wide Identification and Expression Analysis of the SBP-box Gene Family in Sweet Potato(Ipomoea batatas)
SQUAMOSA promoter binding protein(SBP)-box genes belong to a transcription factor family that is unique to plants.They are widely found in green plants,and are capable of regulating vital physiological processes,including plant growth and development,signal transduction,and response to abiotic stresses.At present,multiple SBP-box genes in plants have been continually reported.To explore the distribution of SBP-box genes and their ef-fects on the growth and development of sweet potato,30 SBP-box genes were identified from the whole genome of sweet potato in this study,which were sequentially named IbSPLl～IbSPL30.Their gene structures,protein struc-tures and physicochemical properties,phylogenetic relationships,tandem repeats,cis-acting elements distribution and tissue-specific expression profile among others were identified as well.The results indicated that physicochem-ical properties and structures of most SBP-box proteins in sweet potato were differentiated,which were closely evolutionarily related to Arabidopsis thaliana homologs,but had different numbers and types of motif distributions among different subfamilies.SBP-box genes in sweet potato were evenly distributed among chromosomes,and ex-cept for 3 chromosomes,the remaining presented a distribution of 1～4 SBP-box genes in each chromosome.In ad-dition,the analysis of colinearity revealed that the SBP-box genes in sweet potato may be derived from multiple tandem repeats events.By promoter region cis-acting element analysis,expression analyses of different tissues and those with different treatments,a total of 16 genes were found associated with the growth and development of aboveground stems,leaves and flowers of sweet potato,and 7 genes were associated with drought stress response.In this study,the molecular basis of SBP-box genes in sweet potato was analyzed from various views,and the ef-fects of SBP-box genes on the growth and development of sweet potato were investigated.Our findings may pro-vide a certain theoretical basis for molecular breeding of sweet potato.
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