Research Focus: Using Southern China’s staple and specialty fruits such as banana, litchi, and model plant tomato as subjects, this research investigates from the perspectives of histone methylation modification and chromatin remodeling to: 1) elucidate the epigenetic mechanisms underlying tomato fruit coloration, nutrient-related quality formation, and quality maintenance; 2) unravel the interaction mechanisms between postharvest quality deterioration (banana chilling injury, litchi browning) and environmental factors. The aim is to advance the understanding of fruit quality formation, maintenance, and deterioration mechanisms, thereby providing novel insights for developing environmentally-friendly preservation technologies.