Insights into the roles of chromatin-remodeling complex HOS15-PWR-HDA9 in plant development and stress responses.

This review highlights the central role of the HOS15-PWR-HDA9 complex in integrating chromatin remodeling with plant development and stress adaptation, offering insights for improving crop resilience. Being sessile by nature, plants have signaling pathways that perceive and transmit environmental signals, inducing epigenetic modifications that are instrumental in plant development and stress responses. Acetylation and methylation are key features of chromatin remodeling and are crucial in transcriptional reprogramming for tissue-specific gene expression and silencing. Recently, different classes of chromatin remodelers have been studied in plants. Among them, the multiprotein complex HOS15-PWR-HDA9 has been well documented to regulate the acetylation status of histone 3 at the chromatin of target genes during plant development and in response to various stresses, thereby facilitating gene expression and/or repression. In this review, we discuss the critical role of the HOS15-PWR-HDA9 complex in chromatin remodeling during plant development and stress responses.