Abstract：

N6-methyladenosine (m6A) is the most abundant mRNA modification in eukaryotes and is an important regulator of gene expression as well as many other critical biological processes. However, the characteristics and functions of m6A in peanut (Arachis hypogea L.) resistance to bacterial wilt (BW) remain unknown. Here, we analyzed the dynamic of m6A during infection of resistant (H108) and susceptible (H107) peanut accessions with Ralstonia solanacearum (R. solanacearum), the causative

agent of BW. Throughout the transcriptome, we identified ‘URUAY’ as a highly conserved motif for m6A in peanut. The majority of differential m6A located within the 30 untranslated region (UTR) of the transcript, with fewer in the exons. Integrative analysis of RNA-Seq and m6A methylomes suggests the correlation between m6A and gene expression in peanut R. solanacearum infection, and functional analysis reveals that m6A-associated genes were related to plant-pathogen interaction. Our experimental analysis suggests that AhALKBH15 is an m6A demethylase in peanut, leading to decreased m6A levels and upregulation of the resistance gene AhCQ2G6Y. The upregulation of AhCQ2G6Y expression appears to promote BW resistance in the H108 accession.

Key Words:

bacterial wilt, demethylase,

disease resistance, m6A modification, peanut.