MicroRNA319-TCP19-IAA3.2 Module Mediates Lateral Root Growth in <i>Populus tomentosa</i>.

ABSTRACT: MicroRNA319 (miR319) and its targets TEOSINTE-BRANCHED1/CYCLOIDEA/PCF (TCP) transcription factors are well-characterized regulators of leaf and flower development, yet their role in root development remains elusive. Here, we demonstrated that overexpression of miR319a led to a decrease in the number and density of lateral roots in poplar, while repressing miR319a by short tandem target mimics (STTM) promoted lateral root (LR) development. The auxin signaling repressors IAA3.1 and IAA3.2 were upregulated in miR319a-OE plants but downregulated in miR319a-STTM plants. After exogenous applications of naphthaleneacetic acid (NAA), which exhibited the characteristics and physiological functions of the endogenous auxin indole-3-acetic acid, the number and

SUBMITTER: Li J 

PROVIDER: S-EPMC12388896 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature