Whole-genome sequencing of RD31 and mRD31 mutant lines
This study investigated submergence-tolerant rice lines derived from the RD31 background through electron beam-induced mutagenesis. Combining physiological screening and whole-genome resequencing, we confirmed the presence of the SUB1A-1 gene and identified genome-wide variants associated with enhanced flood tolerance. The mutants exhibited traits consistent with a SUB1A-1-mediated quiescence strategy. These findings provide new insights into the genetic and physiological basis of submergence tolerance in the mutant lines