Abstract
In this study, we employed comparative genomics and gene ontology theory, and used genome database of soybean and its legume model plants Medicago truncatula , Lotus Japonicus , Glycine max to identify 11 candidate genes, ELF3/ELF4 , CCR2, CRB , LWD1/LWD2 , FIO1 , LUX , ZIK4 , LIP1 , SFR6 , ARR3/ARR4 and TEJ, related to circadian clock regulation pathway. We analyzed the functions and evolutionary trends of these candidate clock-related genes by building molecular evolution trees, protein conserved domain and sequence alignment of orthologs genes. The research showed that there are varying degrees of differentiation in the clock-control pathway between Arabidopsis thaliana and legume species, the differentiation between Lotus japonicas , Medicago truncatula and Arabidopsis in clock regulatory networks is greater than between soybean and Arabidopsis , this may due to more genomic evolutional events such as duplication and reorganization happened in soybean.
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