fruit-ripening
Fruit ripening is the biological process by which fruits transition from an unpalatable state to one that is sweeter, softer, and more colorful through coordinated changes in sugar content, cell wall structure, and pigmentation. Understanding ripening is central to plant science because it involves complex hormonal signaling—particularly ethylene in climacteric fruits—and metabolic reprogramming that determines both fruit quality and post-harvest longevity. Research into ripening mechanisms has broad implications for improving crop shelf life, reducing food waste, and engineering fruits with enhanced nutritional profiles.
open_in_new WikipediaPubMed · 2026-04-01
A new review examines how fruits use special 'alternative' energy pathways in their cells during growth and ripening, revealing these pathways are critical for maintaining metabolic balance rather than just being biochemical sideshows.
Alternative respiratory pathways — including alternative oxidase, uncoupling proteins, and type II NAD(P)H dehydrogenases — are now recognized as central regulators of fruit ripening, not minor metabolic curiosities.
These pathways support both primary metabolism (energy production) and secondary metabolism (flavor compounds, pigments, antioxidants) by maintaining redox and energy balance in fruit cells.
The classical climacteric vs. non-climacteric fruit distinction is being revisited in light of new evidence about how these alternative mitochondrial components function differently across fruit types.