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Summary Among many mRNA modifications, adenine methylation at the N6position (N6‐methyladenosine, m6A) is known to affect mRNA biology extensively. The influence of m6A has yet to be assessed under drought, one of the most impactful abiotic stresses.We show thatArabidopsis thaliana(L.) Heynh. (Arabidopsis) plants lacking mRNA ADENOSINE METHYLASE (MTA) are drought‐sensitive. Subsequently, we comprehensively assess the impacts of MTA‐dependent m6A changes during drought on mRNA abundance, stability, and translation in Arabidopsis.During drought, there is a global trend toward hypermethylation of many protein‐coding transcripts that does not occur inmta. We also observe complex regulation of m6A at a transcript‐specific level, possibly reflecting compensation by other m6A components. Importantly, a subset of transcripts that are hypermethylated in an MTA‐dependent manner exhibited reduced turnover and translation inmta, compared with wild‐type (WT) plants, during drought. Additionally, MTA impacts transcript stability and translation independently of m6A. We also correlate drought‐associated deposition of m6A with increased translation of modulators of drought response, such asRD29A,COR47,COR413,ALDH2B,ERD7, andABF4in WT, which is impaired inmta.m6A is dynamic during drought and, alongside MTA, promotes tolerance by regulating drought‐responsive changes in transcript turnover and translation.more » « less
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