Brassinosteroid Coordinates with ROS, Auxin and Gibberellin to Promote Mesocotyl Elongation and Deep-Sowing Tolerance in Maize.

ABSTRACT: Mesocotyl elongation is the key determinant of deep-sowing tolerance in maize. Sowing at an appropriate depth allows the seedling to exploit water and nutrients stored in deeper soil layers, thereby enhancing its ability to withstand drought and other abiotic stresses. Mesocotyl elongation is regulated by the phytohormones brassinosteroid (BR), auxin (IAA), gibberellin (GA), and reactive oxygen species (ROS). However, whether and how BR coordinates IAA, GA, and ROS to control mesocotyl elongation in maize remains unclear. Here, we demonstrated that BRs orchestrate ROS, IAA, and GA signaling to remodel cell-wall metabolism in mesocotyl cells, promote cell elongation, and, consequently, strengthen deep-sowing tolerance. BR promoted mesocotyl elongation through multiple routes: (1) decreasing

SUBMITTER: Wang Y 

PROVIDER: S-EPMC12384915 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature