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| Identification and comparative analysis of DGAT1genes among cotton and other model plants |
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| Abstract: |
| Diacylglycerol acyltransferases（DGATs） are the key enzymes that catalyze the triacylglycerol
biosynthesis. The comparative analysis was performed on the DGAT1 genes of cotton and other model plants. Sequence
analysis showed that most of the DGAT1 genes，with high variation of intron length and high conservation phrase of
intron，from the cotton and other model plants had 16 exons. Additionally，7 conserved motifs were present in these
DGAT1 proteins. The core motifs were overlapped with the functional domain of DGAT1 protein. Phylogenetic analysis
demonstrated that gene tree was highly consistent to species tree，suggesting that the evolutionary history of species
was revealed by gene tree. There was single copy of DGAT1 gene in cotton，but at least two duplicated DGAT1 genes
were identified in rice，maize，poplar and moss genomes. The selective pressure analysis showed that the PtDGAT1a/
PtDGAT1b was under positive selection，but four pair homologous genes were under negative selection. 17 positively
selected sites were identified at subgroup level（P<0.05），suggesting these subgroup under relaxed functional
constraint. The findings provide a basis of function and evolution of DGAT1 genes in cotton and other model plants. |
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