Dynein light chain (DLC) is one important component of the dynein complexes, which have been proved involving in a variety of cellular functions. However, higher plants lack all other components of the complexes except DLCs, suggesting that in plants, the DLC protein does not carry out the same function as it in animals. Therefore, the function of this family in plants is mysterious. In this study, we investigated the DLC gene family in 15 plant species and analyzed their expression profiles. In total, 128 DLC genes were identified from the 15 studied plant species and were divided into eight groups by their phylogenetic relation. Highly conserved gene structure and motif arrangement was discovered within each group, indicating their functional correlation. Genetic variation and recombination events were also detected in DLC genes. Through selection analyses, we also identified some significant site-specific constraints in most of the DLC paralogs. In addition, DLC genes presented various expression profiles in different development stages, or under different abiotic stresses or phytohormone treatments. This may be associated with a variety of cis-elements responding to stress and phytohormone in the upstream sequences of the DLC genes. Functional network analysis exhibited 123 physical or functional interactions. The results provide a foundation for exploring the characterization of the DLC genes in plants and offer insights for additional functional studies.
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