Abstract
DNA-binding with one finger (Dof) proteins comprise a plant-specific transcription factor family involved in plant growth, development and stress responses. This study presents a genome-wide comparison of Dof family genes in physic nut (Jatropha curcas) and castor bean (Ricinus communis), two Euphorbiaceae plants that have not experienced any recent whole-genome duplication. A total of 25 or 24 Dof genes were identified from physic nut and castor genomes, respectively, where JcDof genes are distributed across nine out of 11 chromosomes. Phylogenetic analysis assigned these genes into nine groups representing four subfamilies, and 24 orthologous groups were also proposed based on comparison of physic nut, castor, Arabidopsis and rice Dofs. Conserved microsynteny was observed between physic nut and castor Dof-coding scaffolds, which allowed anchoring of 23 RcDof genes to nine physic nut chromosomes. In contrast to how no recent duplicate was present in castor, two tandem duplications and one gene loss were found in the Dof gene family of physic nut. Global transcriptome profiling revealed diverse patterns of Jc/RcDof genes over various tissues, and key Dof genes involved in flower development and stress response were also identified in physic nut. These findings provide valuable information for further studies of Dof genes in physic nut and castor.
Highlights
DNA-binding with one finger (Dof) proteins comprise a plant-specific transcription factor family, which is defined by the presence of the highly conserved Dof domain at the N-terminus (Yanagisawa, 2002)
Compared with the original genome annotation (Wu et al, 2015), one more locus was identified from scaffold241
This gene was identified by Wang et al (2018), JcDof7.4, another member encoded by scaffold341, was not reported in their study
Summary
DNA-binding with one finger (Dof) proteins comprise a plant-specific transcription factor family, which is defined by the presence of the highly conserved Dof domain at the N-terminus (Yanagisawa, 2002). Genome-wide surveys showed that the Dof gene family is present as a single member in most algae, the family has been highly expanded and diversified in terrestrial plants (Moreno-Risueno et al, 2007; Gupta et al, 2015). Functional analysis performed in several species revealed diverse roles of Dof proteins in various biological processes, for example, light-mediated regulation, vascular system development, flowering control, flower abscission, pollen development, endosperm development, seed development and germination, carbon and nitrogen metabolism, hormone, and stress responses (Yanagisawa, 2002; Noguero et al, 2013; Gupta et al, 2015; Ma et al, 2015)
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