Whole-genome bisulfite sequencing reveals dynamic DNA methylation changes in Vigna radiata under direct and pre-conditioned salt stress

To investigate the role of DNA methylation in salt stress adaptation, we performed whole-genome bisulfite sequencing (WGBS) of mung bean (Vigna radiata cv. Weilv 9) leaves under two treatment regimes: T1 (pre-conditioned with 100 mM NaCl for 24 h, recovered for 48 h, then re-exposed to 100 mM NaCl) and T2 (direct exposure to 100 mM NaCl without preconditioning).

Seedlings were grown hydroponically in half-strength Murashige and Skoog medium under controlled environmental conditions. Genomic DNA was extracted from the first fully expanded true leaves at 0, 6, and 48 h after the onset of the final salt treatment, with three biological replicates per condition. Bisulfite-converted DNA was sequenced to generate genome-wide methylation profiles.