Bioinformatics Analysis of the Intronless Genes in Xanthoceras sorbifolia Genome
The chromosome distribution,replication relationship,KEGG enrichment and cis-elements of intronless genes in Xanthoceras sorbifolia were analyzed.The results showed that a total of 1 858 intronless genes were identified from Xanthoceras sorbifolia genome,accounting for 7.40%of the total genes.The number of intronless genes on each chromosome accounted for 5.64%—9.07%of the total number of genes on the chromosome,and there was a positive correlation with the length of the chromosome and the total number of genes.Gene chromosome mapping analysis showed that intronless genes were more inclined to be distributed at both ends of chromosomes,and more than 90%of collateral homologous pairs had a Ka/Ks value of less than 1,indicating that the intronless genes mainly experienced purification selection in the process of evolution.The lengths of intronless genes were mainly arranged from 201 to 1 400 bp,and the average lengths were significantly shorter than total genes.KEGG enrichment analysis showed that intronless genes were mainly involved in the process of environmental information processing,and a large number of cis-elements related to plant hormone response and stress response were found in the promoter region of genes related to environmental stress response.
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