Plants are sessile organisms that rely on multilayered signaling networks to integrate internal hormonal cues with external environmental inputs. Among plant hormones, the gaseous signal ethylene plays a central role in coordinating growth, senescence, and stress responses across tissues and developmental stages. These ethylene outputs, like many other developmental decisions, are further refined by RNA-based mechanisms, including mRNA quality control and small interfering RNAs (siRNAs), which fine-tune gene expression at post-transcriptional and translational levels. Ultimately, such internal signaling and gene-regulatory circuits must be wired to frontline perception of physical and chemical features of the environment—such as apoplastic pH and osmotic status—so that plant cells can dynamically adjust metabolism and morphology. Together, these interconnected layers underpin developmental plasticity and stress resilience, traits that are critical for crop yield and stability in changing climates.

Building on the conceptual framework outlined above, we have focused on how ethylene signaling, siRNA-based gene silencing, and environmental perception operate at distinct yet complementary levels to shape plant development and stress adaptation. Our work has elucidated multi-level control of the ethylene pathway centered on the transcription factor EIN3, revealed how defects in mRNA decay can trigger ct-siRNA-mediated silencing as an adaptive strategy, and uncovered extracellular peptide–receptor complexes and phase-separating proteins that act as sensors of apoplastic pH and osmotic stress. By integrating these lines of research, we aim to build a coherent framework that connects hormone signaling, gene regulation, and frontline environmental sensing, ultimately informing strategies to engineer crops with enhanced fitness and productivity.