Transcriptome-Wide m6A Methylome Profiling in Sorghum following GA3 Treatment under Salt Stress

Sorghum ("Jitian 3") is a salt-tolerant seed cultivar used regularly in marginal lands, such as those with saline soils. Herein, we examined the potential of employing gibberellic acid (GA(3)) as an inducer of sorghum development during salt stress. Thus far, there have been no reports on the signaling network involved in the GA(3)-mediated regulation of sorghum development. In this study, we demonstrated that the stimulating properties of 50 mg/L GA(3) on sorghum development was far superior to other GA(3) concentrations under a 150 mM NaCl salinity condition. Furthermore, using methylated RNA immunoprecipitation sequencing (MeRIP-seq), we established an m(6)A methylation (m(6)A-M) profile in sorghum following exposure to 50 mg/L GA(3). Overall, 23,363 m(6)A peaks and 16,200 m(6)A genes were screened among the GA(3)-treated and control leaves. These identified peaks were shown to be primarily enriched in the coding, as were the 3 '- and 5 '-untranslated regions. In addition, we employed m(6)A and transcript expression cross-analysis to identify 70 genes with differential transcript expression and simultaneous m(6)A-M. Intriguingly, the principal gene, LOC8066282, which is associated with LOC8084853, was shown to be intricately linked to the phosphatidylinositol signaling, which in turn regulates sorghum development and response to salt stress. This investigation presents a novel RNA m(6)A-M profile in sorghum, which may facilitate new insights into the underlying signaling behind salt stress resistance. This work will also benefit future investigations on foreign GA(3) administration of sorghum.