Microbial necromass carbon enhances arsenic methylation in paddy soils

Proceedings of the National Academy of Sciences, Volume 122, Issue 48, December 2025. SignificanceMicrobial necromass carbon (MNC) is a key component of soil organic carbon, and methylated arsenic (As) critically affects rice yield. However, the role of MNC in regulating microbial As methylation remains unclear. We found that three MNC …