Tissue-specific changes in the RNA structurome mediate salinity response in Arabidopsis.

Area of Science:

• Molecular Biology
• Plant Science
• Genomics

Background:

• Abiotic factors significantly influence plant physiology, yet their effects on in vivo RNA structures remain largely unexplored.
• Salinity stress poses a major threat to global agriculture, affecting crop yield and plant survival.

Purpose of the Study:

• To investigate the impact of salinity stress on the in vivo mRNA structurome of Arabidopsis thaliana.
• To understand the relationship between RNA structural changes and mRNA abundance under stress conditions.

Main Methods:

• Utilized Structure-seq, a method employing dimethyl sulfate reactivity to map RNA structures.
• Assessed mRNA structuromes in Arabidopsis thaliana under controlled salinity stress conditions.
• Analyzed differential structural changes in root and shoot tissues.

Main Results:

• Salinity stress induced tissue-specific refolding of transcripts in roots and shoots.
• An inverse correlation was observed between salt stress-induced changes in transcript reactivity and abundance.
• A phenomenon termed "concordancy," where 5'UTR, CDS, and 3'UTR reactivity changes concertedly, was linked to increased susceptibility to abundance control.
• Concordant structural changes in photosynthesis genes suggest a role in photosynthesis depression under salt stress.

Conclusions:

• In vivo mRNA secondary structures are dynamic and influenced by abiotic factors like salinity.
• Changes in mRNA structure directly impact mRNA abundance, thereby modulating transcriptome function under stress.
• The study reveals a novel mechanism, "concordancy," by which plants regulate gene expression in response to environmental stress.